HTML
<body>
<form action="zhuce.php" method="POST">
<label>
<p>用户名：</p>
<input type="text" name="username">
</label>
<label>
<p>密码：</p>
<input type="password" name="password">
</label>
<label>
<p>验证码：</p>
<img src="yanzhengma.php" id="yzm" onclick="javascript:this.src=this.src+'?time='+Math.random();"><br>
<!--<img src="yanzhengma.php" id="yzm" onclick="yzmround()"><br>-->
<input type="text" name="yzm" autocomplete="off">
</label>
<label>
<input type="submit" value="提交">
</label>
</form>
</body>
<script>
function yzmround(){
var yzm=document.getElementById('yzm')
yzm.src='yanzhengma.php?'+Math.random()
}
</script>
验证码PHP
<?php
session_start();
$img=imagecreatetruecolor(100, 35);
$bcak=imagecolorallocate($img, 238, 232, 170);
$write=imagecolorallocate($img, 0, 0, 255);
$greens=imagecolorallocate($img, 144, 238, 144);
imagefill($img, 0, 0, $bcak);
//随机验证码
$arr=array_merge(range(0,9),range(A,Z),range(a,z));
shuffle($arr);
$str=join(' ',array_slice($arr, 0,4));
$yzms=implode('',explode(' ', $str));
$_SESSION['yzm']=strtolower($yzms);
//验证码
imagettftext($img, 15, 5, 10, 30, $write, 'msyh.ttc', $str);
//干扰素
for ($i=0; $i < 10; $i++) {
$x1= mt_rand(0,100);
$y1= mt_rand(0,35);
$x2= mt_rand(0,100);
$y2= mt_rand(0,35);
imageline($img, $x1, $y1, $x2, $y2, $greens);
}
header('content-type:image/png');
imagepng($img);
imagedestroy($img);
?>
接收PHP
<?php
session_start();
echo "<pre>";
print_r($_POST);
echo "</pre>";
$yzms=$_SESSION['yzm'];
if($_POST['yzm']==$yzms){
echo "1";
}else{
echo "<script>location.href='yzm.php';</script>";
}
?>
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