验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
7 i- X; n3 C F5 q4 g) B+ V
session_start();3 R' r: Z+ a; ?
// 丢弃输出缓冲区的内容 **
5 G( Z% O8 G- a5 w, F3 M8 h
ob_clean();5 y" h: P. e, N. W l0 r3 X+ |' E
header ('Content-Type: image/png');2 P2 m* s' S( V/ `: A. z7 ?2 K
// 1 创建画布
: t9 E: K: f: [0 |
$image=imagecreatetruecolor(100, 30);
' t6 r/ Z1 b0 g( L4 u/ _/ S
// 2 画一个矩形并填充背景颜色为白色7 R' F% \; s% K% z: \! [: }5 f
$color=imagecolorallocate($image, 255, 255, 255);( P! b; k0 M0 C& N* c0 c( L
imagefill($image, 20, 20, $color);
) E& f, b. r+ H; W# k
// for($i=0;$i<4;$i++){
+ Q) ?5 D& Q' [2 O* ~
// $font=6;
6 [2 I3 ?( {1 B* I3 e" |
// $x=rand(5,10)+$i*100/4;
. {* E9 ?7 c& P7 l4 {6 a
// $y=rand(8, 15);( C7 q4 S7 a5 v h' c$ @
// $string=rand(0, 9);5 v+ r9 n+ z) j
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
4 \# D4 Q' b# t+ s6 C6 }
// imagestring($image, $font, $x, $y, $string, $color);
% U! k( ]. i! [3 [, x
// }
( J) N4 s! ^4 L a: }# d
$code='';, \6 u8 v- b* s5 @. N
for($i=0;$i<4;$i++){1 Y: J( @. s$ Q
$fontSize=8;
1 L8 Z4 [' M2 Q' E- Z
$x=rand(5,10)+$i*100/4;
# k+ q, R7 V/ p; S1 s
$y=rand(5, 15);
' E; R1 C4 S, O$ ]( ?" J
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
4 p: y! z; _2 r
$string=substr($data,rand(0, strlen($data)),1);
5 r+ M. g% j' f; N
$code.=$string;) y2 c1 n9 ^" X( c
// 3.2 加载自定义字体* W' R3 ]% B$ G* ]5 a5 p7 g% y2 O
$font_file = '1.ttf';
0 g; @/ I4 D+ e d8 u5 [
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));% M! h1 i) ~. p& Y' z" w; p9 Y
// 把文字填充到画布$ M) x- u8 z9 U y5 Z1 c
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
: s: g' a3 C* y( c% M8 D
imagestring($image, $fontSize, $x, $y, $string, $color);
: i0 k! e- B- G l0 \3 ]6 E, Y
}- M& B8 B& @" S
$_SESSION['code']=$code;//存储在session里' o! ~2 I! u; [( {
for($i=0;$i<200;$i++){
; C y) Y' l! C* d; x
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
2 C. Q/ ^- S4 F% K* z; G7 N
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);; L; L" h$ V) j; a0 ]8 |/ {7 K% V+ B
}
3 h2 B( }' Z* b
for($i=0;$i<2;$i++){
: m" }- h9 G! m% ~
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
2 b* ^3 [1 u0 M1 ]
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
- o; ^( H3 S7 g+ i! g
}5 V i* `* Z7 g+ `1 ~; q
imagepng($image);# f2 B4 p5 v! S( P
imagedestroy($image);
$ {0 V2 c: x9 i1 C( q! F$ z. f# c
; u1 h- J0 `6 ~& C# ~, o8 ]+ z+ b
?>

复制代码

form.php

<?php
* F. Q/ F0 S V5 j2 d# v
if(isset($_REQUEST['code'])){, \. H8 C: L9 y& x2 ~/ z
session_start();! S4 ^4 ]8 q9 ?: J1 a* v4 [5 L
if($_REQUEST['code']==$_SESSION['code']){1 r* {6 B3 j0 p4 J; b
echo "<font color='red'>输入正确</font>";
9 h8 J" q: c5 e+ Q! t; `) G3 c
}else{
, L+ J: a% Z) r* r: L: t" T
echo "<font color='red'>输入错误</font>";
: }/ M- z9 Y, |, c* @" ^
}
2 c! e6 ?" g& l: n ~% k, I
}
: }2 D" F2 V/ D' _' e. \6 J! h$ Y
?>
! J$ B8 P7 C7 d( [3 b0 `5 {
<!DOCTYPE html>7 ^$ v5 o+ ^* V9 J, ^
<html>
. G( { e- ?- y u+ O3 @
<head>
3 g% t+ N/ o& G- Z1 y' ^0 I* a
<meta chartset="UTF-8" />
, y0 K( E# @0 z0 ^
<style type="text/css" rel="stylesheet">
7 }) a! i9 k; p+ L0 S; K2 L1 L
a{! y& ]! M) e |: z$ i7 [, W: T3 q
text-decoration:none;
1 e% l7 v: `4 A* I+ j3 `4 U7 u
font-size:30px;. s2 B) ~5 j% P: `7 m y
color:blue;
' P3 X, _3 k+ \ j! m
}
& v; l# R8 k0 L1 R8 c. a9 q# M1 q
a:hover{2 h' |8 e. ?9 m4 r0 H8 U- w* G
text-decoration:underline;$ v* W9 k. ?- K; b2 I
}! o2 n6 X2 p( R5 S
</style>9 N; _: [# L& r
</head>8 I1 z: b. j, \" O
<body>
, v* L- H( j/ I3 R% ~
<form action="form.php" method="get">6 ~, _( K9 E5 s* _5 o9 Z& X# p% }
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
. i E% g p1 j, ]
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />" }- G# Y/ ?! m, t0 m4 l/ C3 `
请输入验证码: <input name="code" /><br />/ d# C: O! F- g
<input type="submit" value="提交" />
0 x$ ~% j( e% `/ G: Y; F
</form>
& `7 F1 g7 x! i9 y7 R6 d5 Q% O4 X
</body>
8 i" d7 |1 q3 Z- v
<script type="text/javascript">
6 s; }: O. d* \) h9 c: A8 Y$ u2 N
7 M) G6 d) U# G2 i% Q) |
function changeCode(){
( v+ {' ]3 I2 x" R% s4 V S
var img=document.getElementById('img');5 R! R/ K" E8 ]
//img.src='index.php?r='+Math.random();7 G! D- j1 ~8 Z6 \, D; p1 ^( \
img.setAttribute('src','index.php?r='+Math.random());
: t& u" ]6 R1 S# R
}
! j ~1 F3 h0 m4 u
</script> O l3 [+ G6 U" b! H/ W
</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

浏览过的版块