验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();# R% ?* ^3 l7 l6 W' d
// 丢弃输出缓冲区的内容 **
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ob_clean();4 X0 Y( d2 ~4 D8 F9 e3 @
header ('Content-Type: image/png');7 ~8 r7 |# u3 Q6 ]) c7 s
// 1 创建画布. `) y( J7 C" Q% s i9 Q% P
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);" N. b$ I% |. t1 H* ^+ [, m9 u6 }
// 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);, h( Y" E4 e/ {* Q' C5 p, R1 B
// $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);3 \# b, W8 Q- @) }3 p1 T! q* o4 ]
// }, f" @ `) r& J: s
$code='';" J0 @7 S- z: u! I' E* B& ]
for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);$ k/ L# q0 {) M$ o* m/ N
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布6 L# W! ]& k8 l
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);5 G G! X& ^ Z. ]; W: j6 X
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$_SESSION['code']=$code;//存储在session里) `1 @( T3 B2 ]/ \6 X4 E
for($i=0;$i<200;$i++){, q/ S6 K0 I* q3 m4 |8 V
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);; c. b2 _( x) |5 n; L
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));& M5 f) t9 ?) S+ T2 e
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);; P# G5 h: E7 w! W s8 P+ c
}
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imagepng($image);+ e7 u! r. i& D" E! g
imagedestroy($image);$ ?* o& ?+ c$ m; c$ \+ l
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){* W+ h! V/ s/ S
session_start();
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if($_REQUEST['code']==$_SESSION['code']){3 i* T1 n7 a; k& J. _4 p7 S7 F& o
echo "<font color='red'>输入正确</font>";4 j4 H+ x- Z# l! H& g1 o
}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>3 U v% c b" D4 T
<!DOCTYPE html>
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<html>
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<head>0 U& U j) A! G% i0 _7 W# L* R
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;* Z: ^+ A8 m; ]9 \* i9 i3 B% s
font-size:30px;$ M" C$ Z8 i+ D
color:blue;
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a:hover{
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text-decoration:underline;
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</style>
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</head>
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<body>8 M/ o! R3 X5 W2 A6 [
<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 />* u' t) g4 o6 \+ f# Q) ?+ W, m
<input type="submit" value="提交" />
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</form>
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</body>$ i; Q9 ^! o7 M/ v: |8 x- M, t1 q3 g0 g
<script type="text/javascript">$ o" Y% {5 z" H; I8 _( s7 K
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function changeCode(){
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var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());$ M; _" r6 `* v! q: }4 _# Q
}
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</script>
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</html>

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