必须收藏的23个php实用代码片段

在编写代码的时候有个神奇的工具总是好的！下面这里收集了 40+ PHP 代码片段，可以帮助你开发 PHP 项目。
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
?>

以上就是本文的全部内容，希望对大家的学习有所帮助。