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 **, l( ^& n! N* ?1 L" s i+ z
ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);; n2 Q& {; H: z* I- c
// 2 画一个矩形并填充背景颜色为白色# ?+ U! c' t: ~" t4 }
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){6 {; x. d6 z7 A1 C3 {, Y; w
// $font=6;0 V: l/ z" D) e9 P6 u# ^8 G% l
// $x=rand(5,10)+$i*100/4;* E9 O! B2 r. B" \! V! _, ?2 J
// $y=rand(8, 15); U% M& `- R4 g( m
// $string=rand(0, 9);3 c0 w. T5 p \8 s5 }
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);- b, e8 L% y: a! V2 [
// }
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;2 Q0 N. a# ?; S) n2 a% r
$y=rand(5, 15);/ A5 i" R( h) F! ~9 a1 @; @
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);9 h' `0 r0 m4 b- ?% x) `6 h
$code.=$string;
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// 3.2 加载自定义字体9 r* s# s5 ? Q. L
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布) V- s& J4 n% B# G* Q: M4 g
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);& E7 \( n6 J e0 i" P7 L, E
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){% g! I @* J5 t8 b+ p! Q# T
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));+ I* l. D7 \; I8 G6 x& D) n
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);* D3 l/ s" U3 I u& D
}
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imagepng($image);
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imagedestroy($image);; L. {, c& _& J4 U
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?>

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form.php

<?php7 t" E3 N! a" I2 Z9 n- D/ O5 h
if(isset($_REQUEST['code'])){
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session_start();; {8 h) ~/ b6 {. K
if($_REQUEST['code']==$_SESSION['code']){0 {. V* k6 X# \- p: e9 T5 r, M3 {
echo "<font color='red'>输入正确</font>";$ y! A7 G9 I9 |; ~% ?
}else{( i& j# p+ T$ G( {" E) N+ P# E+ G
echo "<font color='red'>输入错误</font>";7 y% r+ X" Z& g
}
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?> Z: d) N! h" M5 |! }, l& s J/ I
<!DOCTYPE html>( H4 w; B2 p3 Z
<html>
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<head>
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<meta chartset="UTF-8" />, B- J* w/ p9 z0 z0 n- x
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;# N2 E- |! t$ P3 b! ~
font-size:30px;# F, Y$ o/ s/ B1 x) v* V
color:blue;# o0 m% m( s% l' ?
}
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a:hover{
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text-decoration:underline;
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</style>$ }7 y! @% m, W* I; _
</head>
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<body>5 z% R/ L6 P+ n0 Y* m: X
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>* b+ _/ C, e/ ]6 a! @. [
<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 />! B1 D& Z+ W$ [
<input type="submit" value="提交" />: h* l2 g3 I) d0 h/ u* W. |+ [
</form>! b& J+ E: Y" w3 C( G& m% _6 t
</body>
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<script type="text/javascript">
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function changeCode(){% M9 m, p& B1 C" j a* y; J
var img=document.getElementById('img'); h* }: }. n% i0 W/ U8 W* r
//img.src='index.php?r='+Math.random();1 J$ B9 o/ B9 |% C, m' M7 W2 I0 F5 l! S
img.setAttribute('src','index.php?r='+Math.random());/ ~" Y4 K: i( @: G( v7 v/ @
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</script>5 W3 K I9 q: L
</html>

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