PHP之路——验证码实现

时间：2023-03-09 09:12:58
PHP之路——验证码实现

验证码生成并保存到session

<?php

	//开始session

	session_start();

	//画布大小

	$image = imagecreate(100, 40);

	$color = imagecolorallocate($image, 255, 255, 255);

	// imagefill($image,0, 0, $color);

	//创建验证码

	$code = '';

	for($i=0;$i<4;$i++){

		$fontsize = 9;

		$fontcolor = imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));

		$x = $i * 25 + 10;

		$y = rand(5,10);

		$num = (string)rand(0,9);

		$code .= $num;

		imagestring($image, $fontsize, $x, $y, $num, $fontcolor);

	}

	//验证码记录到session

	$_SESSION['code'] = $code;

	//增加干扰元素点

	for ($i=0; $i <800 ; $i++) {

		$color = imagecolorallocate($image, rand(50,200), rand(50,200), rand(50,200));

		imagesetpixel($image, rand(0,100), rand(0,40), $color);

	}

	//增加干扰线

	for ($i=0; $i <5 ; $i++) {

		$color = imagecolorallocate($image, rand(50,200), rand(50,200), rand(50,200));

		imageline($image, rand(10,180), rand(10,180), rand(10,180), rand(10,180), $color);

	}

	//说明这个是一个图片

	header("content-type:image/png");

	//输出到浏览器

	imagepng($image);

	//关闭

	imagedestroy($image);

html文件

<!DOCTYPE html>

<html>

<head>

	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

	<title></title>

</head>

<body>

<div><img src="yzimg.php" width="100" height="40" id="yzimg" onclick="huan()"></div>

<div><input type="text" id="yzm"></input></div>

<button id="btn">提交</button>

<script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>

<script type="text/javascript">

	function huan(){

		var num = Math.random() * 10;

		document.getElementById('yzimg').src = 'yzimg.php?r=' + num;

	}

	$('#btn').click(function(){

		$.post(

				'/yzm/yz.php',

				{'yzm':$('#yzm').val()},

				function(data){

					if (data == 0) {

						alert('YES');

					} else {

						alert('NO');

						huan();

					}

				}

			)

	})

</script>

</body>

</html>

验证验证码文件

<?php

	//必须开启session

	session_start();

	if ($_POST['yzm'] != $_SESSION['code']) {

		# code...

		echo 1;

	} else {

		echo 0;

	}

 ?>

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