验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php- v9 M) |' ?( C. h, ~, b+ X' ]* u
session_start();
$ m) X0 f) q; R- _+ U
// 丢弃输出缓冲区的内容 **% z% X c: y! C$ k
ob_clean();
' D k, z, b4 k+ |
header ('Content-Type: image/png');$ _# d* j% o3 P# Q
// 1 创建画布; v8 d% |0 Z* ?" W( x H& p
$image=imagecreatetruecolor(100, 30);
' W: h' ]3 Q+ W
// 2 画一个矩形并填充背景颜色为白色5 H E- S4 x* G/ R2 v
$color=imagecolorallocate($image, 255, 255, 255);7 B8 ~3 t: n* f+ K5 N+ r- p7 E9 B
imagefill($image, 20, 20, $color);
. H, s7 y' U. S) s F
// for($i=0;$i<4;$i++){( i: g4 A, \- l/ Y: h3 l
// $font=6;
* U! r# _& h3 |3 |$ ~. g
// $x=rand(5,10)+$i*100/4;" y {" U% m' q, m( X, B
// $y=rand(8, 15); b2 r. T7 y% ?; ^; Q* z' W
// $string=rand(0, 9);
' I6 \) @2 M/ R0 r8 `
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));0 e. Z9 ]! ~, _) B' @* u9 \
// imagestring($image, $font, $x, $y, $string, $color);
1 m! U' N( s: o- P
// }% @( r/ x# H0 Y2 L4 o( ^
$code='';: _' e- G2 l5 P" @3 O/ F7 m! C
for($i=0;$i<4;$i++){
: s& F5 U4 W1 M( \
$fontSize=8;
2 K. K) Z% V; c/ r2 T5 `' [
$x=rand(5,10)+$i*100/4;: G. Z% p1 ~6 s" M ~
$y=rand(5, 15);- p9 n) d/ F* j
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
$ f: d5 b4 m" z& d5 t7 U4 m$ z$ p
$string=substr($data,rand(0, strlen($data)),1);
! t% T7 V( h2 V- G( m
$code.=$string;0 M# E4 S, G/ F7 g* d. n( T
// 3.2 加载自定义字体4 E* c0 e% ?5 A9 B4 R/ U& ?
$font_file = '1.ttf';
0 N- F/ d) j, D$ a3 P$ {! q& m
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
: c4 M- L ?. ?# A2 _" s
// 把文字填充到画布, Y4 U7 b6 A* q. O2 B/ _; d
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);* E& a* d; f+ j
imagestring($image, $fontSize, $x, $y, $string, $color);
& C" L1 h+ ~- {2 @! A J
}: k) X# \. @. h) |
$_SESSION['code']=$code;//存储在session里
4 v( }. f1 N, ^' I
for($i=0;$i<200;$i++){$ v+ W# k0 D) m0 g# I$ X/ x# ?- h" Z
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
! h+ k: I5 B7 P
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
) \& Q, [; e+ H! N9 s# P3 S
}2 W( N" s! |% z4 B% o
for($i=0;$i<2;$i++){. W: v8 W% X4 R+ _1 F
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));% L! R' `4 B c
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
# U$ `$ [- V2 L
}
0 Y5 `( v" I _$ H% f6 Y, y
imagepng($image);
6 Q! m" S' G( l) g" e" R
imagedestroy($image);
) ^. [7 n, ~0 R% r0 U7 I& m9 l
# h( a$ g J1 p' Z7 X: ^1 f
?>

复制代码

form.php

<?php
g! d. u3 ^- D3 V9 m( [% @
if(isset($_REQUEST['code'])){( H- L+ B: m0 O
session_start();% P0 j/ {; b: Z8 Q6 h1 X
if($_REQUEST['code']==$_SESSION['code']){5 h0 E0 q! Z1 x) L+ P- P
echo "<font color='red'>输入正确</font>";
, b! \ R5 Q. t' m' ]
}else{
2 c5 a# E, g# i9 J; j
echo "<font color='red'>输入错误</font>";7 m0 x% Y+ P% [# F
}# P5 {& s* q" ~0 l/ V7 L1 ?
}3 R! g, E7 l6 v7 ^+ ]0 \7 u5 Z' H# h
?>6 O0 G& C$ N" R2 Y; Z
<!DOCTYPE html>
m& s" u0 p) N3 l
<html>* }. l9 r J- c' |- d# M8 U
<head>, X Z. h* ]( j2 u5 ^5 S
<meta chartset="UTF-8" />% @0 i l: R" P# r- q( _3 b. u" b
<style type="text/css" rel="stylesheet">" y0 N" o/ \9 Z( ?; o0 w
a{
/ G! T+ M0 d1 c% F( n' e" t
text-decoration:none;
- `: u4 h7 L) g+ [9 N) I
font-size:30px;9 [- @/ M8 S6 Q
color:blue;
1 z% Z- s0 n$ T
}# f' r6 C: g- P
a:hover{
; F+ [! C5 Q3 p s
text-decoration:underline;
/ s3 `% d: \! e6 f+ o
}: v2 W7 N: j0 W5 _/ L
</style>6 S# a1 V! } \& \$ o) X
</head>
% f/ e0 s. A4 @1 t: P# k
<body>
" n$ P0 g2 [) I' V+ G2 r4 Z; l
<form action="form.php" method="get">
/ Y6 \- A7 R/ E" A8 E" w4 Q! l
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>; P. I8 u! n0 R/ A. x
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />% K( I" I7 q8 M
请输入验证码: <input name="code" /><br />5 K, N7 M7 x% l0 R3 A0 T/ a' S
<input type="submit" value="提交" />" _" ^' S3 N @7 R
</form>
& r, c/ v* i+ s1 H; l, b
</body>8 F9 l @/ }, a1 G, u
<script type="text/javascript">9 z; e ]8 ?& j) m4 S( c
+ d4 u4 Z \3 ]9 g e
function changeCode(){
2 n# M) t3 J: P
var img=document.getElementById('img');# c' ?. R- h( A
//img.src='index.php?r='+Math.random();, [* {/ ?2 G" _. r$ S' S
img.setAttribute('src','index.php?r='+Math.random());
* d2 Q; C# i* d' Z
}
, f& O/ O" F& b7 v
</script>4 ?5 x$ A4 s5 @. t+ d* X
</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