46 个非常有用的 PHP 代码片段

这些 PHP 片段对于 PHP 初学者也非常有帮助，非常容易学习，让我们开始学习吧～

1. 发送 SMS


在开发 Web 或者移动应用的时候，经常会遇到需要发送 SMS 给用户，或者因为登录原因，或者是为了发送信息。下面的 PHP 代码就实现了发送 SMS 的功能。
为了使用任何的语言发送 SMS，需要一个 SMS gateway。大部分的 SMS 会提供一个 API，这里是使用 MSG91 作为 SMS gateway。

function send_sms($mobile,$msg)
{
$authKey = "XXXXXXXXXXX";
date_default_timezone_set("Asia/Kolkata");
$date = strftime("%Y-%m-%d %H:%M:%S");
//Multiple mobiles numbers separated by comma
$mobileNumber = $mobile;

//Sender ID,While using route4 sender id should be 6 characters long.
$senderId = "IKOONK";

//Your message to send, Add URL encoding here.
$message = urlencode($msg);

//Define route 
$route = "template";
//Prepare you post parameters
$postData = array(
 'authkey' => $authKey,
 'mobiles' => $mobileNumber,
 'message' => $message,
 'sender' => $senderId,
 'route' => $route
);

//API URL
$url="https://control.msg91.com/sendhttp.php";

// init the resource
$ch = curl_init();
curl_setopt_array($ch, array(
 CURLOPT_URL => $url,
 CURLOPT_RETURNTRANSFER => true,
 CURLOPT_POST => true,
 CURLOPT_POSTFIELDS => $postData
 //,CURLOPT_FOLLOWLOCATION => true
));

//Ignore SSL certificate verification
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

//get response
$output = curl_exec($ch);
//Print error if any
if(curl_errno($ch))
{
 echo 'error:' . curl_error($ch);
}

curl_close($ch);
}

其中“$authKey = "XXXXXXXXXXX";”需要你输入你的密码，“$senderId = "IKOONK";”需要你输入你的 SenderID。当输入移动号码的时候需要指定国家代码 (比如，美国是 1，印度是 91 )。
语法：

<?php
$message = "Hello World";
$mobile = "918112998787";
send_sms($mobile,$message);
?>

2. 使用 mandrill 发送邮件
Mandrill 是一款强大的 SMTP 提供器。开发者倾向于使用一个第三方 SMTP provider 来获取更好的收件交付。
下面的函数中，你需要把 “Mandrill.php” 放在同一个文件夹，作为 PHP 文件，这样就可以使用TA来发送邮件。

function send_email($to_email,$subject,$message1)
{
require_once 'Mandrill.php';
$apikey = 'XXXXXXXXXX'; //specify your api key here
$mandrill = new Mandrill($apikey);

$message = new stdClass();
$message->html = $message1;
$message->text = $message1;
$message->subject = $subject;
$message->from_email = "blog@koonk.com";//Sender Email
$message->from_name = "KOONK";//Sender Name
$message->to = array(array("email" => $to_email));
$message->track_opens = true;

$response = $mandrill->messages->send($message);
}

$apikey = 'XXXXXXXXXX'; //specify your api key here”这里需要你指定你的 API 密钥（从 Mandrill 账户中获得）。
语法：

<?php
$to = "abc@example.com";
$subject = "This is a test email";
$message = "Hello World!";
send_email($to,$subject,$message);
?>

为了达到最好的效果，最好按照 Mandrill 的教程去配置 DNS。

3. PHP 函数：阻止 SQL 注入
SQL 注入或者 SQLi 常见的攻击网站的手段，使用下面的代码可以帮助你防止这些工具。

function clean($input)
{
 if (is_array($input))
 {
 foreach ($input as $key => $val)
  {
  $output[$key] = clean($val);
  // $output[$key] = $this->clean($val);
 }
 }
 else
 {
 $output = (string) $input;
 // if magic quotes is on then use strip slashes
 if (get_magic_quotes_gpc()) 
 {
  $output = stripslashes($output);
 }
 // $output = strip_tags($output);
 $output = htmlentities($output, ENT_QUOTES, 'UTF-8');
 }
// return the clean text
 return $output;
}

语法：

<?php
$text = "<script>alert(1)</script>";
$text = clean($text);
echo $text;
?>

4. 检测用户位置
使用下面的函数，可以检测用户是在哪个城市访问你的网站

function detect_city($ip) {

 $default = 'UNKNOWN';

 $curlopt_useragent = 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6 (.NET CLR 3.5.30729)';

 $url = 'http://ipinfodb.com/ip_locator.php?ip=' . urlencode($ip);
 $ch = curl_init();

 $curl_opt = array(
  CURLOPT_FOLLOWLOCATION => 1,
  CURLOPT_HEADER => 0,
  CURLOPT_RETURNTRANSFER => 1,
  CURLOPT_USERAGENT => $curlopt_useragent,
  CURLOPT_URL => $url,
  CURLOPT_TIMEOUT  => 1,
  CURLOPT_REFERER  => 'http://' . $_SERVER['HTTP_HOST'],
 );

 curl_setopt_array($ch, $curl_opt);

 $content = curl_exec($ch);

 if (!is_null($curl_info)) {
  $curl_info = curl_getinfo($ch);
 }

 curl_close($ch);

 if ( preg_match('{<li>City : ([^<]*)</li>}i', $content, $regs) ) {
  $city = $regs[1];
 }
 if ( preg_match('{<li>State/Province : ([^<]*)</li>}i', $content, $regs) ) {
  $state = $regs[1];
 }

 if( $city!='' && $state!='' ){
  $location = $city . ', ' . $state;
  return $location;
 }else{
  return $default; 
 }

 }

语法：

<?php
$ip = $_SERVER['REMOTE_ADDR'];
$city = detect_city($ip);
echo $city;
?>

5. 获取 Web 页面的源代码
使用下面的函数，可以获取任意 Web 页面的 HTML 代码

function display_sourcecode($url)
{
$lines = file($url);
$output = "";
foreach ($lines as $line_num => $line) { 
 // loop thru each line and prepend line numbers
 $output.= "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "n";
}
}

语法：

<?php
$url = "http://blog.koonk.com";
$source = display_sourcecode($url);
echo $source;
?>

6. 计算喜欢你的 Facebook 页面的用户

function fb_fan_count($facebook_name)
{
 $data = json_decode(file_get_contents("https://graph.facebook.com/".$facebook_name));
 $likes = $data->likes;
 return $likes;
}

语法：

<?php
$page = "koonktechnologies";
$count = fb_fan_count($page);
echo $count;
?>

7. 确定任意图片的主导颜色

function dominant_color($image)
{
$i = imagecreatefromjpeg($image);
for ($x=0;$x<imagesx($i);$x++) {
 for ($y=0;$y<imagesy($i);$y++) {
 $rgb = imagecolorat($i,$x,$y);
 $r = ($rgb >> 16) & 0xFF;
 $g = ($rgb >> & 0xFF;
 $b = $rgb & 0xFF;
 $rTotal += $r;
 $gTotal += $g;
 $bTotal += $b;
 $total++;
 }
}
$rAverage = round($rTotal/$total);
$gAverage = round($gTotal/$total);
$bAverage = round($bTotal/$total);
}

8. whois 查询
使用下面的函数可以获取任何域名用户的完整细节

function whois_query($domain) {

 // fix the domain name:
 $domain = strtolower(trim($domain));
 $domain = preg_replace('/^http:///i', '', $domain);
 $domain = preg_replace('/^www./i', '', $domain);
 $domain = explode('/', $domain);
 $domain = trim($domain[0]);

 // split the TLD from domain name
 $_domain = explode('.', $domain);
 $lst = count($_domain)-1;
 $ext = $_domain[$lst];

 // You find resources and lists 
 // like these on wikipedia: 
 //
 // http://de.wikipedia.org/wiki/Whois
 //
 $servers = array(
 "biz" => "whois.neulevel.biz",
 "com" => "whois.internic.net",
 "us" => "whois.nic.us",
 "coop" => "whois.nic.coop",
 "info" => "whois.nic.info",
 "name" => "whois.nic.name",
 "net" => "whois.internic.net",
 "gov" => "whois.nic.gov",
 "edu" => "whois.internic.net",
 "mil" => "rs.internic.net",
 "int" => "whois.iana.org",
 "ac" => "whois.nic.ac",
 "ae" => "whois.uaenic.ae",
 "at" => "whois.ripe.net",
 "au" => "whois.aunic.net",
 "be" => "whois.dns.be",
 "bg" => "whois.ripe.net",
 "br" => "whois.registro.br",
 "bz" => "whois.belizenic.bz",
 "ca" => "whois.cira.ca",
 "cc" => "whois.nic.cc",
 "ch" => "whois.nic.ch",
 "cl" => "whois.nic.cl",
 "cn" => "whois.cnnic.net.cn",
 "cz" => "whois.nic.cz",
 "de" => "whois.nic.de",
 "fr" => "whois.nic.fr",
 "hu" => "whois.nic.hu",
 "ie" => "whois.domainregistry.ie",
 "il" => "whois.isoc.org.il",
 "in" => "whois.ncst.ernet.in",
 "ir" => "whois.nic.ir",
 "mc" => "whois.ripe.net",
 "to" => "whois.tonic.to",
 "tv" => "whois.tv",
 "ru" => "whois.ripn.net",
 "org" => "whois.pir.org",
 "aero" => "whois.information.aero",
 "nl" => "whois.domain-registry.nl"
 );

 if (!isset($servers[$ext])){
 die('Error: No matching nic server found!');
 }

 $nic_server = $servers[$ext];

 $output = '';

 // connect to whois server:
 if ($conn = fsockopen ($nic_server, 43)) {
 fputs($conn, $domain."rn");
 while(!feof($conn)) {
  $output .= fgets($conn,128);
 }
 fclose($conn);
 }
 else { die('Error: Could not connect to ' . $nic_server . '!'); }

 return $output;
}

语法：

<?php
$domain = "http://www.blog.koonk.com";
$result = whois_query($domain);
print_r($result);
?>

9. 验证邮箱地址
有时候，当在网站填写表单，用户可能会输入错误的邮箱地址，这个函数可以验证邮箱地址是否有效。

function is_validemail($email)
{
$check = 0;
if(filter_var($email,FILTER_VALIDATE_EMAIL))
{
$check = 1;
}
return $check;
}

语法：
<?php
$email = "blog@koonk.com";
$check = is_validemail($email);
echo $check;
// If the output is 1, then email is valid.
?>

10. 获取用户的真实 IP

function getRealIpAddr() 
{ 
 if (!emptyempty($_SERVER['HTTP_CLIENT_IP'])) 
 { 
 $ip=$_SERVER['HTTP_CLIENT_IP']; 
 } 
 elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR'])) 
 //to check ip is pass from proxy 
 { 
 $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; 
 } 
 else 
 { 
 $ip=$_SERVER['REMOTE_ADDR']; 
 } 
 return $ip; 
}

语法：

<?php
$ip = getRealIpAddr();
echo $ip;
?>

11. 转换 URL：从字符串变成超链接
如果你正在开发论坛，博客或者是一个常规的表单提交，很多时候都要用户访问一个网站。使用这个函数，URL 字符串就可以自动的转换为超链接。

function makeClickableLinks($text) 
{ 
 $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)', 
 '<a href="1">1</a>', $text); 
 $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)', 
 '1<a href="http://2">2</a>', $text); 
 $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})', 
 '<a href="mailto:1">1</a>', $text); 

return $text; 
}

语法：
<?php
$text = "This is my first post on http://blog.koonk.com";
$text = makeClickableLinks($text);
echo $text;
?>

12. 阻止多个 IP 访问你的网站
这个代码片段可以方便你禁止某些特定的 IP 地址访问你的网站

if ( !file_exists('blocked_ips.txt') ) {
 $deny_ips = array(
 '127.0.0.1',
 '192.168.1.1',
 '83.76.27.9',
 '192.168.1.163'
 );
} else {
 $deny_ips = file('blocked_ips.txt');
}
// read user ip adress:
$ip = isset($_SERVER['REMOTE_ADDR']) ? trim($_SERVER['REMOTE_ADDR']) : '';

// search current IP in $deny_ips array
if ( (array_search($ip, $deny_ips))!== FALSE ) {
 // address is blocked:
 echo 'Your IP adress ('.$ip.') was blocked!';
 exit;
}

13. 强制性文件下载
如果你需要下载特定的文件而不用另开新窗口，下面的代码片段可以帮助你。

function force_download($file) 
{ 
 $dir = "../log/exports/"; 
 if ((isset($file))&&(file_exists($dir.$file))) { 
 header("Content-type: application/force-download"); 
 header('Content-Disposition: inline; filename="' . $dir.$file . '"'); 
 header("Content-Transfer-Encoding: Binary"); 
 header("Content-length: ".filesize($dir.$file)); 
 header('Content-Type: application/octet-stream'); 
 header('Content-Disposition: attachment; filename="' . $file . '"'); 
 readfile("$dir$file"); 
 } else { 
 echo "No file selected"; 
 } 
}

语法：

<php
force_download("image.jpg");
?>

14. 创建 JSON 数据
使用下面的 PHP 片段可以创建 JSON 数据，可以方便你创建移动应用的 Web 服务

$json_data = array ('id'=>1,'name'=>"Mohit");
echo json_encode($json_data);

15. 压缩 zip 文件
使用下面的 PHP 片段可以即时压缩 zip 文件

function create_zip($files = array(),$destination = '',$overwrite = false) { 
 //if the zip file already exists and overwrite is false, return false 
 if(file_exists($destination) && !$overwrite) { return false; } 
 //vars 
 $valid_files = array(); 
 //if files were passed in... 
 if(is_array($files)) { 
 //cycle through each file 
 foreach($files as $file) { 
  //make sure the file exists 
  if(file_exists($file)) { 
  $valid_files[] = $file; 
  } 
 } 
 } 
 //if we have good files... 
 if(count($valid_files)) { 
 //create the archive 
 $zip = new ZipArchive(); 
 if($zip->open($destination,$overwrite ? ZIPARCHIVE::OVERWRITE : ZIPARCHIVE::CREATE) !== true) { 
  return false; 
 } 
 //add the files 
 foreach($valid_files as $file) { 
  $zip->addFile($file,$file); 
 } 
 //debug 
 //echo 'The zip archive contains ',$zip->numFiles,' files with a status of ',$zip->status; 

 //close the zip -- done! 
 $zip->close(); 

 //check to make sure the file exists 
 return file_exists($destination); 
 } 
 else 
 { 
 return false; 
 } 
}

语法：
<?php
$files=array('file1.jpg', 'file2.jpg', 'file3.gif'); 
create_zip($files, 'myzipfile.zip', true); 
?>

16. 解压文件

function unzip($location,$newLocation)
{
 if(exec("unzip $location",$arr)){
  mkdir($newLocation);
  for($i = 1;$i< count($arr);$i++){
  $file = trim(preg_replace("~inflating: ~","",$arr[$i]));
  copy($location.'/'.$file,$newLocation.'/'.$file);
  unlink($location.'/'.$file);
  }
  return TRUE;
 }else{
  return FALSE;
 }
}

语法：

<?php
unzip('test.zip','unziped/test'); //File would be unzipped in unziped/test folder
?>

17. 缩放图片

function resize_image($filename, $tmpname, $xmax, $ymax) 
{ 
 $ext = explode(".", $filename); 
 $ext = $ext[count($ext)-1]; 

 if($ext == "jpg" || $ext == "jpeg") 
 $im = imagecreatefromjpeg($tmpname); 
 elseif($ext == "png") 
 $im = imagecreatefrompng($tmpname); 
 elseif($ext == "gif") 
 $im = imagecreatefromgif($tmpname); 

 $x = imagesx($im); 
 $y = imagesy($im); 

 if($x <= $xmax && $y <= $ymax) 
 return $im; 

 if($x >= $y) { 
 $newx = $xmax; 
 $newy = $newx * $y / $x; 
 } 
 else { 
 $newy = $ymax; 
 $newx = $x / $y * $newy; 
 } 

 $im2 = imagecreatetruecolor($newx, $newy); 
 imagecopyresized($im2, $im, 0, 0, 0, 0, floor($newx), floor($newy), $x, $y); 
 return $im2; 
}

18. 使用 mail() 发送邮件
之前我们提供了如何使用 Mandrill 发送邮件的 PHP 代码片段，但是如果你不想使用第三方服务，那么可以使用下面的 PHP 代码片段。

function send_mail($to,$subject,$body)
{
$headers = "From: KOONKrn";
$headers .= "Reply-To: blog@koonk.comrn";
$headers .= "Return-Path: blog@koonk.comrn";
$headers .= "X-Mailer: PHP5n";
$headers .= 'MIME-Version: 1.0' . "n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "rn";
mail($to,$subject,$body,$headers);
}

语法：
<?php
$to = "admin@koonk.com";
$subject = "This is a test mail";
$body = "Hello World!";
send_mail($to,$subject,$body);
?>

19. 把秒转换成天数，小时数和分钟

function secsToStr($secs) {
 if($secs>=86400){$days=floor($secs/86400);$secs=$secs%86400;$r=$days.' day';if($days<>1){$r.='s';}if($secs>0){$r.=', ';}}
 if($secs>=3600){$hours=floor($secs/3600);$secs=$secs%3600;$r.=$hours.' hour';if($hours<>1){$r.='s';}if($secs>0){$r.=', ';}}
 if($secs>=60){$minutes=floor($secs/60);$secs=$secs%60;$r.=$minutes.' minute';if($minutes<>1){$r.='s';}if($secs>0){$r.=', ';}}
 $r.=$secs.' second';if($secs<>1){$r.='s';}
 return $r;
}

语法：

<?php
$seconds = "56789";
$output = secsToStr($seconds);
echo $output;
?>

20. 数据库连接
连接 MySQL 数据库

<?php
$DBNAME = 'koonk';
$HOST = 'localhost';
$DBUSER = 'root';
$DBPASS = 'koonk';
$CONNECT = mysql_connect($HOST,$DBUSER,$DBPASS);
if(!$CONNECT)
{
 echo 'MySQL Error: '.mysql_error();
}
$SELECT = mysql_select_db($DBNAME);
if(!$SELECT)
{
 echo 'MySQL Error: '.mysql_error();
}
?>

21. 目录清单
使用下面的 PHP 代码片段可以在一个目录中列出所有文件和文件夹

function list_files($dir)
{
 if(is_dir($dir))
 {
 if($handle = opendir($dir))
 {
  while(($file = readdir($handle)) !== false)
  {
  if($file != "." && $file != ".." && $file != "Thumbs.db"/*pesky windows, images..*/)
  {
   echo '<a target="_blank" href="'.$dir.$file.'">'.$file.'</a>'."n";
  }
  }
  closedir($handle);
 }
 }
}

语法：

<?php
 list_files("images/"); //This will list all files of images folder
?>

22. 检测用户语言
使用下面的 PHP 代码片段可以检测用户浏览器所使用的语言

function get_client_language($availableLanguages, $default='en'){
 if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
 $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']);
 foreach ($langs as $value){
  $choice=substr($value,0,2);
  if(in_array($choice, $availableLanguages)){
  return $choice;
  }
 }
 } 
 return $default;
}

23. 查看 CSV 文件

function readCSV($csvFile){
 $file_handle = fopen($csvFile, 'r');
 while (!feof($file_handle) ) {
 $line_of_text[] = fgetcsv($file_handle, 1024);
 }
 fclose($file_handle);
 return $line_of_text;
}

语法：
<?php
$csvFile = "test.csv";
$csv = readCSV($csvFile);
$a = csv[0][0]; // This will get value of Column 1 & Row 1
?>

24. 从 PHP 数据创建 CSV 文件

function generateCsv($data, $delimiter = ',', $enclosure = '"') {
 $handle = fopen('php://temp', 'r+');
 foreach ($data as $line) {
  fputcsv($handle, $line, $delimiter, $enclosure);
 }
 rewind($handle);
 while (!feof($handle)) {
  $contents .= fread($handle, 8192);
 }
 fclose($handle);
 return $contents;
}

语法：
<?php
$data[0] = "apple";
$data[1] = "oranges";
generateCsv($data, $delimiter = ',', $enclosure = '"');
?>

25. 解析 XML 数据

$xml_string="<?xml version='1.0'?>
<moleculedb>
 <molecule name='Benzine'>
 <symbol>ben</symbol>
 <code>A</code>
 </molecule>
 <molecule name='Water'>
 <symbol>h2o</symbol>
 <code>K</code>
 </molecule>
</moleculedb>";

//load the xml string using simplexml function
$xml = simplexml_load_string($xml_string);

//loop through the each node of molecule
foreach ($xml->molecule as $record)
{
 //attribute are accessted by
 echo $record['name'], ' ';
 //node are accessted by -> operator
 echo $record->symbol, ' ';
 echo $record->code, '';
}

26. 解析 JSON 数据

$json_string='{"id":1,"name":"rolf","country":"russia","office":["google","oracle"]} ';
$obj=json_decode($json_string);
//print the parsed data
echo $obj->name; //displays rolf
echo $obj->office[0]; //displays google

27. 获取当前页面 URL
这个 PHP 片段可以帮助你让用户登录后直接跳转到之前浏览的页面

function current_url()
{
$url = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$validURL = str_replace("&", "&", $url);
return validURL;
}

语法：

<?php
echo "Currently you are on: ".current_url();
?>

28. 从任意的 Twitter 账号获取最新的 Tweet

function my_twitter($username) 
{
 $no_of_tweets = 1;
 $feed = "http://search.twitter.com/search.atom?q=from:" . $username . "&rpp=" . $no_of_tweets;
 $xml = simplexml_load_file($feed);
 foreach($xml->children() as $child) {
 foreach ($child as $value) {
  if($value->getName() == "link") $link = $value['href'];
  if($value->getName() == "content") {
  $content = $value . "";
 echo '<p class="twit">'.$content.' <a class="twt" href="'.$link.'" title=""> </a></p>';
  } 
 }
 } 
}

语法：
<?php
$handle = "koonktech";
my_twitter($handle);
?>

29. 转发数量
使用这个 PHP 片段可以检测你的页面 URL 有多少转发数量

function tweetCount($url) {
 $content = file_get_contents("http://api.tweetmeme.com/url_info?url=".$url);
 $element = new SimpleXmlElement($content);
 $retweets = $element->story->url_count;
 if($retweets){
 return $retweets;
 } else {
 return 0;
 }
}

语法：
<?php
$url = "http://blog.koonk.com";
$count = tweetCount($url);
return $count;
?>

30. 计算两个日期的差

<?php
$date1 = date( 'Y-m-d' );
$date2 = "2015-12-04";
$diff = abs(strtotime($date2) - strtotime($date1));
$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
printf("%d years, %d months, %d daysn", $years, $months, $days);
-------------------------------------------------------- OR
$date1 = new DateTime("2007-03-24");
$date2 = new DateTime("2009-06-26");
$interval = $date1->diff($date2);
echo "difference " . $interval->y . " years, " . $interval->m." months, ".$interval->d." days "; 
// shows the total amount of days (not divided into years, months and days like above)
echo "difference " . $interval->days . " days ";
-------------------------------------------------------- OR

/**
 * Calculate differences between two dates with precise semantics. Based on PHPs DateTime::diff()
 * implementation by Derick Rethans. Ported to PHP by Emil H, 2011-05-02. No rights reserved.
 * 
 * See here for original code:
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/tm2unixtime.c?revision=302890&view=markup
 * http://svn.php.net/viewvc/php/php-src/trunk/ext/date/lib/interval.c?revision=298973&view=markup
 */
function _date_range_limit($start, $end, $adj, $a, $b, $result)
{
 if ($result[$a] < $start) {
 $result[$b] -= intval(($start - $result[$a] - 1) / $adj) + 1;
 $result[$a] += $adj * intval(($start - $result[$a] - 1) / $adj + 1);
 }
 if ($result[$a] >= $end) {
 $result[$b] += intval($result[$a] / $adj);
 $result[$a] -= $adj * intval($result[$a] / $adj);
 }
 return $result;
}
function _date_range_limit_days($base, $result)
{
 $days_in_month_leap = array(31, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
 $days_in_month = array(31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
 _date_range_limit(1, 13, 12, "m", "y", &$base);
 $year = $base["y"];
 $month = $base["m"];
 if (!$result["invert"]) {
 while ($result["d"] < 0) {
  $month--;
  if ($month < 1) {
  $month += 12;
  $year--;
  }
  $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
  $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
  $result["d"] += $days;
  $result["m"]--;
 }
 } else {
 while ($result["d"] < 0) {
  $leapyear = $year % 400 == 0 || ($year % 100 != 0 && $year % 4 == 0);
  $days = $leapyear ? $days_in_month_leap[$month] : $days_in_month[$month];
  $result["d"] += $days;
  $result["m"]--;
  $month++;
  if ($month > 12) {
  $month -= 12;
  $year++;
  }
 }
 }
 return $result;
}
function _date_normalize($base, $result)
{
 $result = _date_range_limit(0, 60, 60, "s", "i", $result);
 $result = _date_range_limit(0, 60, 60, "i", "h", $result);
 $result = _date_range_limit(0, 24, 24, "h", "d", $result);
 $result = _date_range_limit(0, 12, 12, "m", "y", $result);
 $result = _date_range_limit_days(&$base, &$result);
 $result = _date_range_limit(0, 12, 12, "m", "y", $result);
 return $result;
}
/**
 * Accepts two unix timestamps.
 */
function _date_diff($one, $two)
{
 $invert = false;
 if ($one > $two) {
 list($one, $two) = array($two, $one);
 $invert = true;
 }
 $key = array("y", "m", "d", "h", "i", "s");
 $a = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $one))));
 $b = array_combine($key, array_map("intval", explode(" ", date("Y m d H i s", $two))));
 $result = array();
 $result["y"] = $b["y"] - $a["y"];
 $result["m"] = $b["m"] - $a["m"];
 $result["d"] = $b["d"] - $a["d"];
 $result["h"] = $b["h"] - $a["h"];
 $result["i"] = $b["i"] - $a["i"];
 $result["s"] = $b["s"] - $a["s"];
 $result["invert"] = $invert ? 1 : 0;
 $result["days"] = intval(abs(($one - $two)/86400));
 if ($invert) {
 _date_normalize(&$a, &$result);
 } else {
 _date_normalize(&$b, &$result);
 }
 return $result;
}
$date = "2014-12-04 19:37:22";
echo '<pre>';
print_r( _date_diff( strtotime($date), time() ) );
echo '</pre>'; 
?>

31. 删除文件夹内容

function Delete($path)
{
 if (is_dir($path) === true)
 {
 $files = array_diff(scandir($path), array('.', '..'));
 foreach ($files as $file)
 {
  Delete(realpath($path) . '/' . $file);
 }
 return rmdir($path);
 }
 else if (is_file($path) === true)
 {
 return unlink($path);
 }
 return false;
}

语法：

<?php
$path = "images/";
Delete($path); // This will delete images folder along with its contents.
?>

32. 搜索和高亮字符串中的关键字

function highlighter_text($text, $words)
{
 $split_words = explode( " " , $words );
 foreach($split_words as $word)
 {
 $color = "#4285F4";
 $text = preg_replace("|($word)|Ui" ,
  "<span style="color:".$color.";"><b>$1</b></span>" , $text );
 }
 return $text;
}

语法：

<?php
$string = "I like chocolates and I like apples";
$words = "apple";
echo highlighter_text($string ,$words);
?>

33. 写入文件

<?
$filename = 'blog.csv';
$fp = fopen($filename, 'w');
$output = " Hello ";
$output .= " World! ";
$output .= "rn";
fputs($fp, $output);
fclose($fp);
?>

34. 根据 URL 下载图片

function imagefromURL($image,$rename)
{
$ch = curl_init($image);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER,1);
$rawdata=curl_exec ($ch);
curl_close ($ch);
$fp = fopen("$rename",'w');
fwrite($fp, $rawdata); 
fclose($fp);
}

语法：

<?php
$url = "http://koonk.com/images/logo.png";
$rename = "koonk.png";
imagefromURL($url,$rename);
?>

35. 检测 URL 是否有效

function isvalidURL($url)
{
$check = 0;
if (filter_var($url, FILTER_VALIDATE_URL) !== false) {
 $check = 1;
}
return $check;
}

语法：
<?php
$url = "http://koonk.com";
$check = checkvalidURL($url);
echo $check; //if returns 1 then URL is valid.
?>

36. 生成二维码

function qr_code($data, $type = "TXT", $size ='150', $ec='L', $margin='0') 
{
 $types = array("URL" =--> "http://", "TEL" => "TEL:", "TXT"=>"", "EMAIL" => "MAILTO:");
 if(!in_array($type,array("URL", "TEL", "TXT", "EMAIL")))
 {
 $type = "TXT";
 }
 if (!preg_match('/^'.$types[$type].'/', $data))
 {
 $data = str_replace("\", "", $types[$type]).$data;
 }
 $ch = curl_init();
 $data = urlencode($data);
 curl_setopt($ch, CURLOPT_URL, 'http://chart.apis.google.com/chart');
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_POSTFIELDS, 'chs='.$size.'x'.$size.'&cht=qr&chld='.$ec.'|'.$margin.'&chl='.$data);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_HEADER, false);
 curl_setopt($ch, CURLOPT_TIMEOUT, 30);
 $response = curl_exec($ch);
 curl_close($ch);
 return $response;
}

语法：

<?php
header("Content-type: image/png");
echo qr_code("http://koonk.com", "URL");
?>

37. 计算两个地图坐标之间的距离

function getDistanceBetweenPointsNew($latitude1, $longitude1, $latitude2, $longitude2) {
 $theta = $longitude1 - $longitude2;
 $miles = (sin(deg2rad($latitude1)) * sin(deg2rad($latitude2))) + (cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * cos(deg2rad($theta)));
 $miles = acos($miles);
 $miles = rad2deg($miles);
 $miles = $miles * 60 * 1.1515;
 $feet = $miles * 5280;
 $yards = $feet / 3;
 $kilometers = $miles * 1.609344;
 $meters = $kilometers * 1000;
 return compact('miles','feet','yards','kilometers','meters'); 
}

语法：

<?php
$point1 = array('lat' => 40.770623, 'long' => -73.964367);
$point2 = array('lat' => 40.758224, 'long' => -73.917404);
$distance = getDistanceBetweenPointsNew($point1['lat'], $point1['long'], $point2['lat'], $point2['long']);
foreach ($distance as $unit => $value) {
 echo $unit.': '.number_format($value,4).'';
}
?>

38. 获取一个特定话题标签的所有 Tweets

function getTweets($hash_tag) {
 $url = 'http://search.twitter.com/search.atom?q='.urlencode($hash_tag) ;
 echo "<p>Connecting to <strong>$url</strong> ...</p>";
 $ch = curl_init($url);
 curl_setopt ($ch, CURLOPT_RETURNTRANSFER, TRUE);
 $xml = curl_exec ($ch);
 curl_close ($ch);
 //If you want to see the response from Twitter, uncomment this next part out:
 //echo "<p>Response:</p>";
 //echo "<pre>".htmlspecialchars($xml)."</pre>";
 $affected = 0;
 $twelement = new SimpleXMLElement($xml);
 foreach ($twelement->entry as $entry) {
 $text = trim($entry->title);
 $author = trim($entry->author->name);
 $time = strtotime($entry->published);
 $id = $entry->id;
 echo "<p>Tweet from ".$author.": <strong>".$text."</strong> <em>Posted ".date('n/j/y g:i a',$time)."</em></p>";
 }
 return true ;
}

39. 添加 th,st,nd 或者 rd 作为数字的后缀

Friday the 13th
function ordinal($cdnl){ 
 $test_c = abs($cdnl) % 10; 
 $ext = ((abs($cdnl) %100 < 21 && abs($cdnl) %100 > 4) ? 'th'
  : (($test_c < 4) ? ($test_c < 3) ? ($test_c < 2) ? ($test_c < 1) 
  ? 'th' : 'st' : 'nd' : 'rd' : 'th')); 
 return $cdnl.$ext; 
}

语法：

<?php
$number = 10;
echo ordinal($number); //output is 10th
?>

40. 限制文件下载的速度

<?php
// local file that should be send to the client
$local_file = 'test-file.zip';
// filename that the user gets as default
$download_file = 'your-download-name.zip';

// set the download rate limit (=> 20,5 kb/s)
$download_rate = 20.5; 
if(file_exists($local_file) && is_file($local_file)) {
 // send headers
 header('Cache-control: private');
 header('Content-Type: application/octet-stream'); 
 header('Content-Length: '.filesize($local_file));
 header('Content-Disposition: filename='.$download_file);

 // flush content
 flush(); 
 // open file stream
 $file = fopen($local_file, "r"); 
 while(!feof($file)) {

 // send the current file part to the browser
 print fread($file, round($download_rate * 1024)); 

 // flush the content to the browser
 flush();

 // sleep one second
 sleep(1); 
 } 

 // close file stream
 fclose($file);}
else {
 die('Error: The file '.$local_file.' does not exist!');
}
?>

41. 把文本转换成图片

<?php
header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button.png");
$color = imagecolorallocate($im, 255, 255, 255);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
$py = 9;
$fontSize = 1;
imagestring($im, fontSize, $px, $py, $string, $color);
imagepng($im);
imagedestroy($im);
?>

42. 获取远程文件的大小

function remote_filesize($url, $user = "", $pw = "")
{
 ob_start();
 $ch = curl_init($url);
 curl_setopt($ch, CURLOPT_HEADER, 1);
 curl_setopt($ch, CURLOPT_NOBODY, 1);
 if(!empty($user) && !empty($pw))
 {
 $headers = array('Authorization: Basic ' . base64_encode("$user:$pw"));
 curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
 }
 $ok = curl_exec($ch);
 curl_close($ch);
 $head = ob_get_contents();
 ob_end_clean();
 $regex = '/Content-Length:s([0-9].+?)s/';
 $count = preg_match($regex, $head, $matches);
 return isset($matches[1]) ? $matches[1] : "unknown";
}

语法：

<?php
$file = "http://koonk.com/images/logo.png";
$size = remote_filesize($url);
echo $size;
?>

43. 使用 imagebrick 进行 pdf 到图像的转换

<?php
$pdf_file = './pdf/demo.pdf';
$save_to = './jpg/demo.jpg'; //make sure that apache has permissions to write in this folder! (common problem)
//execute ImageMagick command 'convert' and convert PDF to JPG with applied settings
exec('convert "'.$pdf_file.'" -colorspace RGB -resize 800 "'.$save_to.'"', $output, $return_var);
if($return_var == 0) {  //if exec successfuly converted pdf to jpg
 print "Conversion OK";
}
else print "Conversion failed.".$output;
?>

44. 使用 tinyurl 生成短网址

function get_tiny_url($url) 
{ 
 $ch = curl_init(); 
 $timeout = 5; 
 curl_setopt($ch,CURLOPT_URL,'http://tinyurl.com/api-create.php?url='.$url); 
 curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); 
 curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,$timeout); 
 $data = curl_exec($ch); 
 curl_close($ch); 
 return $data; 
}

语法：

<?php
$url = "http://blog.koonk.com/2015/07/Hello-World";
$tinyurl = get_tiny_url($url);
echo $tinyurl;
?>

45. youtube 下载链接生成器
使用下面的 PHP 片段可以让你的用户下载 Youtube 视频

function str_between($string, $start, $end)
{ 
$string = " ".$string; $ini = strpos($string,$start); if ($ini == 0) return ""; $ini += strlen($start); $len = strpos($string,$end,$ini) - $ini; return substr($string,$ini,$len); }
function get_youtube_download_link(){
 $youtube_link = $_GET['youtube'];
 $youtube_page = file_get_contents($youtube_link);
 $v_id = str_between($youtube_page, "&video_id=", "&");
 $t_id = str_between($youtube_page, "&t=", "&");
 $flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id";
 $hq_flv_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=6";
 $mp4_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=18";
 $threegp_link = "http://www.youtube.com/get_video?video_id=$v_id&t=$t_id&fmt=17";
 echo "ttDownload (right-click > save as):ntt";
 echo "<a href="$flv_link">FLV</a>ntt";
 echo "<a href="$hq_flv_link">HQ FLV (if available)</a>ntt";
 echo "<a href="$mp4_link">MP4</a>ntt";
 echo "<a href="$threegp_link">3GP</a>n";
}

46. Facebook 样式的时间戳

Facebook (x mins age, y hours ago etc)
function nicetime($date)
{
 if(empty($date)) {
 return "No date provided";
 }

 $periods  = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
 $lengths  = array("60","60","24","7","4.35","12","10");

 $now  = time();
 $unix_date  = strtotime($date);

 // check validity of date
 if(empty($unix_date)) { 
 return "Bad date";
 }
 // is it future date or past date
 if($now > $unix_date) { 
 $difference = $now - $unix_date;
 $tense  = "ago";

 } else {
 $difference = $unix_date - $now;
 $tense  = "from now";
 }

 for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
 $difference /= $lengths[$j];
 }

 $difference = round($difference);

 if($difference != 1) {
 $periods[$j].= "s";
 }

 return "$difference $periods[$j] {$tense}";
}

语法：

<?php
$date = "2015-07-05 03:45";
$result = nicetime($date); // 2 days ago
?>

文章转自：http://blog.koonk.com