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create_code.php
<?php
session_start();
header("Content-type: image/png");
$str = "1,2,3,4,5,6,7,8,9,a,b,c,d,f,g";
$list = explode(",", $str);
$cmax = count($list) - 1;
$verifyCode = '';
for ( $i=0; $i < 5; $i++ ){
$randnum = mt_rand(0, $cmax);
$verifyCode .= $list[$randnum];
}
$_SESSION['code'] = $verifyCode;
$im = imagecreate(58,28);
$black = imagecolorallocate($im, 0,0,0);
$white = imagecolorallocate($im, 255,255,255);
$gray = imagecolorallocate($im, 200,200,200);
$red = imagecolorallocate($im, 255, 0, 0);
imagefill($im,0,0,$white);
imagestring($im, 5, 10, 8, $verifyCode, $black);
for($i=0;$i<50;$i++)
{
imagesetpixel($im, rand()p , rand()0 , $black);
imagesetpixel($im, rand()p , rand()0 , $red);
imagesetpixel($im, rand()p , rand()0 , $gray);
}
imagepng($im);
imagedestroy($im);
?>
引用
demo.html
<!-- DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www./DTD/xhtml-mobile10.dtd" -->
<html xmlns="http://www./1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form action="act.php" method="post">
<input type="text" name="code" />
<img id="code" src="create_code.php" alt="看不清楚，换一张" style="cursor: pointer; vertical-align:middle;" onClick="create_code()"/>
<!--<button type="button" onClick="create_code()">更换</button>-->
<button type="submit">提交</button>
</form>
<script>
function create_code(){
document.getElementByIdx_x('code').src = 'create_code.php?'+Math.random()*10000;
}
</script>
</body>
</html>
act.php
<?php
session_start();
if($_POST['code'] == $_SESSION['code']){
echo 'ok';
}else{
echo 'no';
}
?>
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