验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();( n8 D8 P: A! _9 G- R- ]4 T; H% r
header ('Content-Type: image/png');
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// 1 创建画布; ?# F G$ L: a* t
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);2 R4 s9 P" r; I8 l
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);0 E% Y1 w# Y1 b I5 L; P6 H
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);
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// }6 d1 U: e M: |3 t
$code='';: x: c. Q9 g, K3 {1 w2 D5 b9 w
for($i=0;$i<4;$i++){
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$fontSize=8;! f! Z% L3 h, T- w3 \! Y/ T8 N
$x=rand(5,10)+$i*100/4;. r- j# Y/ M$ b6 x9 }
$y=rand(5, 15);: d2 B4 e( o' i- r
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;/ c1 r# G0 x' I) D A* t1 G n
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布1 a& q, z- a: F) U" s) E
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里/ j7 G# i; W* r' r
for($i=0;$i<200;$i++){5 b! p: ]$ r6 I8 q% E
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));, ^ v$ U5 L, G' Q$ N$ h" h
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);; n# h! r% r4 x+ w
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));; W, M6 p3 L$ F+ Y
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);7 a3 v; P8 l5 N7 E) o, n; G
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imagepng($image);
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imagedestroy($image);3 }& C& }0 v& k; _$ I8 x& M
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?>

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form.php

<?php5 W$ d. ?0 W1 x: {2 k
if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";1 p8 L, S2 w6 j) Q+ s2 Z
}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>
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<!DOCTYPE html>
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<html>3 g: s! R' A* z9 N& u, Q* u1 y
<head>7 M; C( R: V# A" ?5 N N/ r, ~1 P
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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text-decoration:none;0 z+ s& @: O: Q" \. |# R# p
font-size:30px;
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color:blue;+ A/ H; ~ l4 I w
}
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a:hover{
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text-decoration:underline;
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}
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</style>
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</head>
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<body>
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<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
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<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
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请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />. L( v" m% B* Y" }+ M
</form>: l( W( g# o9 }" V
</body>
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<script type="text/javascript">
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function changeCode(){6 E' z6 F. J' @' o
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();1 C. w' g2 L0 X9 m! Q) g; \
img.setAttribute('src','index.php?r='+Math.random());6 O' t' S5 g& j
} v r7 y: s4 I& C
</script>
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</html>

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