PHP入门学习的几个不错的实例代码

1,php连接数据库

<?php

$dbhost = 'localhost';
$dbuser = 'root'; //你的mysql用户名
$dbpass = '123456'; //你的mysql密码
$dbname = 'data'; //你的mysql库名

//连接本地数据库
$GLOBALS["conn"] = mysql_connect($dbhost,$dbuser,$dbpass);

//打开数据库
mysql_select_db($dbname,$GLOBALS["conn"]);

?>

2.php读取数据库中,某一字段值

<?php

//读取一列数据
$sql="select from ec_admin";
$result = mysql_query($sql,$GLOBALS["conn"]);

printf("用户名: %s<br>n", mysql_result($result,3,"UserName"));
printf("密码: %s<br>n", mysql_result($result,3,"UserPass"));

?>

3,php插入某一条数据

<?php

$sql="insert into ec_admin(UserName,UserPass) values('liugongxun2','jakemary2')";
$result=mysql_query($sql,$GLOBALS["conn"])or die(mysql_error());

?>

4,php while循环

<?php

$sql="select from ec_admin";
$result = mysql_query($sql,$GLOBALS["conn"]);
while($myrow = mysql_fetch_row($result))
{
printf("用户名%s %s密码<br />",$myrow[1],$myrow[2]);
}

?>

5,php do while循环

<?php

$sql="select * from ec_admin";
$result = mysql_query($sql,$GLOBALS["conn"]);
if($myrow = mysql_fetch_array($result))
{
do
{
printf("用户名%s %s密码<br />",$myrow["UserName"],$myrow["UserPass"]);
}while($myrow = mysql_fetch_array($result));
}
?>

6,php判断表单是否提交

<?php

if ($submit)

{}

?>