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admin · 发表于 2018-12-16 01:00:13

index.php

<?php7 F9 _% b& V8 `) W( p+ L4 ?
session_start();+ ]( [, C! @' s3 `5 u) T, H0 F) n
// 丢弃输出缓冲区的内容 **
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ob_clean();
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header ('Content-Type: image/png');" j; c9 D; \( a2 }5 d* v# g, Q% S
// 1 创建画布
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$image=imagecreatetruecolor(100, 30); L3 p, `" w2 S! q
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){% R1 F( w( L4 i
// $font=6;; a2 _: \2 p8 `! \, i7 ?
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);2 g) [, H1 [) w( J0 N
// $string=rand(0, 9);( p6 R$ u3 p0 T, i
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;. j$ N/ T0 O* Z0 J! Y+ {+ V4 h
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';2 a5 U0 }7 C$ z' T( B, m' y2 e
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';5 K; ` R; [2 T* p& s8 R0 j7 y
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));7 x& E+ |# v8 s' l `- m# K
// 把文字填充到画布
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//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']=$code;//存储在session里9 J+ {- H0 }# x4 x5 s" y
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));+ u! F1 E8 ] k4 I2 M; ]. P$ _
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));! n! J' b4 d4 J8 z' z/ S5 ?$ N9 z
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);1 E6 H* w, z/ Z% ~
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imagepng($image);" s# i9 }. v- O
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){2 A, `' a3 C+ g( L6 t, E
session_start();5 u- T' y" S& P
if($_REQUEST['code']==$_SESSION['code']){! O1 G4 L# ^* G
echo "<font color='red'>输入正确</font>";: `) C6 d9 o: {1 ]* l! }* K& |, 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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?>
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<!DOCTYPE html>7 _+ U/ p% S7 g- ?/ A
<html>
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<head>9 x1 Z; J1 I! N( s: O2 v( V. ^# U
<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;
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font-size:30px;
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color:blue;
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a:hover{& S n7 j7 J9 A5 h8 x+ H/ u6 t
text-decoration:underline;& E' j7 a/ E- B4 Z& h
}
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</style>5 Z. o, E% o6 T1 J! L. o6 f- i
</head>
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<body>' @9 r7 K1 t% c O: S; B
<form action="form.php" method="get">1 `5 F# ?4 X- Z" Q2 j9 d: v
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 />( ?# [ h% b7 n- K( L g
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />* B# y+ k2 f( }" s+ _0 G' u
</form>
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</body>+ z* [- G2 {/ q1 ^1 `
<script type="text/javascript">% O/ o- W; F: \/ [# o/ G! H& @% k3 D
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function changeCode(){, G, U# m- N- Z8 W5 u) j3 n
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());, A, ?& l; ]" R7 K a+ u8 r
}
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</script>2 ]% D" r* c! p: W- z( E, H$ e
</html>

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