验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php* R8 D$ v8 C5 D/ I
session_start();
/ w, q6 m6 X, r8 `# b5 T D
// 丢弃输出缓冲区的内容 **
+ P1 m, z# r1 p: ~. Y
ob_clean();; V* A! j/ ~7 j r
header ('Content-Type: image/png');
6 P! W5 x& o0 d" e+ i
// 1 创建画布
9 l4 I: x+ j P5 s
$image=imagecreatetruecolor(100, 30);4 D" W0 f/ K' }
// 2 画一个矩形并填充背景颜色为白色: q- g- p5 Y+ q0 d: J) m' e
$color=imagecolorallocate($image, 255, 255, 255);8 q0 j1 S% v3 u* D1 h
imagefill($image, 20, 20, $color);8 ^' r6 v5 [9 ]4 I- `! x
// for($i=0;$i<4;$i++){
, p3 ]: C! t' h# G9 V! H8 }
// $font=6;6 D: G# ^$ t& A$ z3 R
// $x=rand(5,10)+$i*100/4;
// $y=rand(8, 15);
& A: p E+ P, o3 i/ k
// $string=rand(0, 9);; d# n: e8 L0 H% b. k4 v. \$ {
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));$ `0 q% x! [( r' G9 J
// imagestring($image, $font, $x, $y, $string, $color);4 n/ l8 m2 y' q4 X: N; y
// }
- ~+ s; f7 p$ D5 N- }
$code='';8 I9 S* f. ~& Z& c \! x: _1 G" M
for($i=0;$i<4;$i++){+ ]) [' z$ E3 S9 s6 o9 Y
$fontSize=8;
' D2 c$ o2 L; h. h- h, V* R0 o
$x=rand(5,10)+$i*100/4;
; s- R5 u' ~% U n+ W6 W
$y=rand(5, 15);
$ ?' @. J1 R$ N. _
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';5 M7 J% ~: E i0 y- v
$string=substr($data,rand(0, strlen($data)),1);
) t8 A/ M: b/ N B
$code.=$string;( E4 f0 m$ _1 j! T& E( c
// 3.2 加载自定义字体" F& k* r5 \5 A; S. z2 V
$font_file = '1.ttf';$ Y3 W. H- }4 I4 s$ W
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
4 Z5 J, Z8 N+ C, m" }: z5 F: ?# F' f
// 把文字填充到画布
O. V; G. L) m0 D
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
- s$ a6 k4 L& u# B9 a; j
imagestring($image, $fontSize, $x, $y, $string, $color);
# j! p2 K# L0 p9 ~0 c z! Z$ I2 u
}
9 h3 j/ s7 M' Q: d( @
$_SESSION['code']=$code;//存储在session里' |! G; K0 A- y: {; A e' O, h
for($i=0;$i<200;$i++){1 t1 J f8 }! P6 W
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
3 Y# ^+ {% R4 q5 G/ ?
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);* p* A/ w- \. Y" I
}
+ s, L$ u: M4 L) n; d
for($i=0;$i<2;$i++){" _4 m* M9 s# e6 Y
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));' S7 c+ i9 |7 r; u' {
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
' ^. I' O( p4 l5 [5 Q
}
0 t7 u$ A5 C: O8 q+ K; Z4 x- k9 [# z% H
imagepng($image);4 j2 V/ H" t: s X7 e
imagedestroy($image);& B7 c$ e7 S J9 m
6 ~& {$ V6 f/ X" y }! s8 z
?>

复制代码

form.php

<?php
@0 [8 m7 Y5 W$ g6 |
if(isset($_REQUEST['code'])){
4 `6 u, U2 V4 j/ z6 x2 Q/ ~9 Z! S
session_start();
$ o0 B$ r% O! j8 d+ r
if($_REQUEST['code']==$_SESSION['code']){: u2 ?+ j8 m5 l6 R" t* N8 m
echo "<font color='red'>输入正确</font>";
* F& a0 I; G2 _: I. M, \
}else{
# K' `# O) I6 x: J
echo "<font color='red'>输入错误</font>";+ X& ^4 E# X1 ~ o2 ]1 Y
}
% d& a+ G3 e) ~4 K( Z/ M" [* t
}+ H" r( s) D! P5 ?
?>
, y: c: q# U( u; F: j- B
<!DOCTYPE html>
: t1 J7 C: J# T1 w0 f' Q z" A
<html>! e% b' s1 k* f7 v. T
<head>
: _/ P& \ S0 R+ m7 x
<meta chartset="UTF-8" />
4 Q5 m7 p6 y* A9 M9 q3 _* {
<style type="text/css" rel="stylesheet">
$ P4 o P4 M8 ?0 k, K' O
a{
$ A; M, T9 Z5 ^: Q! Y) G1 ~, `
text-decoration:none;% V! K) O/ O: ^$ m
font-size:30px;5 y0 `/ w: V0 |8 I0 Y( o
color:blue;* J* D; e; d! n
}$ b6 g6 }9 e1 d+ o+ K9 C
a:hover{
! g% s) y0 Q1 e- J- ]# x
text-decoration:underline;
# D2 u0 V8 ?/ D3 P1 ~8 }
}
/ [# {' \* n* F3 P3 ~
</style>
6 T* M& U9 k0 I3 e
</head>" H+ }: i7 t* l1 z
<body>$ O: z- l1 s" ~$ a( c
<form action="form.php" method="get">
- @, M# i! Q( S. r
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
, A+ K3 x$ L6 H3 A" z% b
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
# ]& \& H" p8 x( {3 S
请输入验证码: <input name="code" /><br />4 [1 U [5 x# J j9 E# u- B
<input type="submit" value="提交" />4 A- g( e+ X% m
</form>
+ F; e. j9 X2 D5 u' U; S
</body>( d( C$ ~' ~, G, D
<script type="text/javascript">
7 ]. H$ C9 c6 B1 @
5 l" K& O# _- n8 V _" i
function changeCode(){
" g8 \) V8 R0 T
var img=document.getElementById('img');
$ y& h% h% W2 V: I- m
//img.src='index.php?r='+Math.random();4 G- W0 }0 p3 S
img.setAttribute('src','index.php?r='+Math.random());9 g; ~/ N M$ J. \
}0 _- C9 B+ q S: V
</script>; x. ~5 ~7 j( U" S: ?! l/ j& Y: i
</html>

复制代码

帐号		自动登录	找回密码
密码			立即注册

[php学习资料] 验证码