验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php( l& C7 Y3 y8 x; x4 t% B; g
session_start();
" \- ~( s; n+ X3 { p( R
// 丢弃输出缓冲区的内容 **3 u- r& a& p5 W# A) g* z# N
ob_clean();( z" [" Q; d4 P7 d
header ('Content-Type: image/png');7 w" j. `# j p
// 1 创建画布
& _5 W3 u. I4 {+ @- s
$image=imagecreatetruecolor(100, 30);+ w0 e; z. s+ O, r- t# @2 d$ L
// 2 画一个矩形并填充背景颜色为白色4 [7 Z* d* d" ]. I2 r0 N: Q
$color=imagecolorallocate($image, 255, 255, 255);4 P; u8 n2 O* H
imagefill($image, 20, 20, $color);) P3 R8 y% c5 N8 @8 n' w
// for($i=0;$i<4;$i++){
3 c, o1 h3 M/ @1 y u: A
// $font=6;
* g; j& R% b& ?! |# n: s- z A6 H
// $x=rand(5,10)+$i*100/4;
! p, c, A" t& c" p+ F
// $y=rand(8, 15);
; c+ `# \/ }* c( G+ h; b
// $string=rand(0, 9);0 N6 T+ q( y W- ^5 t' I
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
% ~2 ]5 L0 x# \$ Q* J: s( V- d) f
// imagestring($image, $font, $x, $y, $string, $color);
0 m t1 L2 I2 o' v5 r# t$ ?
// }+ P4 F# C" [/ p: |
$code='';, L! l$ W% D4 `+ L4 i, {# U" H1 I
for($i=0;$i<4;$i++){
3 s& X1 E) S3 M0 b5 X" [1 P4 Z
$fontSize=8;' l( G# G! C# J
$x=rand(5,10)+$i*100/4;- m/ p, K; \! o9 w" O+ }& [) b
$y=rand(5, 15);9 F( t* Z9 ~% @% D* I. z
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
2 m; ?9 f$ o4 q8 @( `* A+ y+ O
$string=substr($data,rand(0, strlen($data)),1);. M4 S# j4 }+ A1 n' ]3 v
$code.=$string;& T& v, _+ h5 @' P5 R0 s" R
// 3.2 加载自定义字体
! p1 t3 M# I9 i& b
$font_file = '1.ttf';* ~7 y. z0 v& G C3 J* b K6 n% y
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));/ }. Y7 c. v% h) v/ w
// 把文字填充到画布+ O6 l0 j7 }; B# l6 W) ~7 S
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
6 {, I" C" N7 q' ]( u
imagestring($image, $fontSize, $x, $y, $string, $color);
' c7 r6 p* G; T
}5 S" c" `/ H. B) T4 r8 m2 D
$_SESSION['code']=$code;//存储在session里
# T3 ~- t( C# }" d8 J; P
for($i=0;$i<200;$i++){8 @ A8 [2 J3 {5 ^; x
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));# T' }% I$ i# K. ^' T
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);% t* ^0 b+ o% k
}
! m0 Q5 U9 X! l) K+ U8 l( M3 U* M, {
for($i=0;$i<2;$i++){
9 Q& ]1 u0 K, N( v ^. c4 Q; d
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
7 j% i1 M$ B( p( x" H: @
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
% h* I. u0 l* k Q( d
}
, O" X4 d8 y. K% O6 c; k* y
imagepng($image);( T3 ~* m2 g" F; v( p
imagedestroy($image);
) c* B0 x" `' R* e' _) K1 A& P7 J. V
' b3 _" S1 Z' \6 m' k
?>

复制代码

form.php

<?php
8 u! F: y, X+ T8 w: H
if(isset($_REQUEST['code'])){
- W* q& ~8 u$ ~, z% i: U( t- ^
session_start();
+ u, x9 B+ C) C/ F" w- i3 N+ v
if($_REQUEST['code']==$_SESSION['code']){* f7 V; i9 ]5 T2 ^3 M1 E, _) B
echo "<font color='red'>输入正确</font>";
7 P7 u1 I2 T1 X/ B2 R, R1 E
}else{
, x$ p7 y- E) }' ~' O
echo "<font color='red'>输入错误</font>";1 ^& g3 O4 a0 g
}
6 ]4 U- o# ?3 z( |$ M
}
- t: h: Q$ P. @9 Z6 i8 y. e# F
?>6 u8 n* x6 t' X: Q! M4 @/ K: s
<!DOCTYPE html>
. ]2 z) L* l$ [3 b$ y# h1 F
<html>
0 `* [" m0 v% I' [+ r3 ?
<head>
" u) d0 U3 N4 y) } J5 Z& Q; r' p2 ]
<meta chartset="UTF-8" />
. E" j# I4 N( ?5 U$ z
<style type="text/css" rel="stylesheet">! b( Z4 g. ?; O5 t8 J& f5 a2 x! v( r
a{
" _6 j; I& V& c9 j
text-decoration:none;. K, M! ~' |9 c9 ?" t5 k
font-size:30px;3 e! B7 C- ?2 j0 d& Q
color:blue;
g }( W4 Z, r: l) W) p8 j
}- C8 {2 w* B9 p* ]4 V
a:hover{
A1 ^6 f$ A) p8 ?
text-decoration:underline;
) o8 [9 ?1 v& _9 f+ G
}, P) l* l" k; j7 m# C9 |, J
</style>3 @. Z8 ]- O9 h5 o/ f# d( V( `
</head>" Z4 l) n+ I8 _5 A
<body>
T P( Q. ~3 p4 `1 j; k4 Q
<form action="form.php" method="get">
! H$ f% d! d/ r2 i2 S: H4 \6 B4 L
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
1 k# O6 N6 [! ?& _
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />' ~* M# t1 E+ k* O
请输入验证码: <input name="code" /><br />& Z- t* \& C$ I j+ H& d
<input type="submit" value="提交" />
+ n* d( w3 ~& L( }, u( `& L9 o; R
</form>1 ?# p) N: Z! }9 }& k, s
</body>
, D8 h; X4 ]7 t+ O
<script type="text/javascript">1 U3 N3 V4 _/ p" g8 L9 t
7 h4 I9 C$ ]& _
function changeCode(){
6 Y" f7 e4 @& M; W5 E; p q+ D+ [9 ~
var img=document.getElementById('img');+ x+ L* r) }* J9 W0 g7 u0 c
//img.src='index.php?r='+Math.random();
( m' J1 V0 B# ?. b; o) U I
img.setAttribute('src','index.php?r='+Math.random());; B; l' y) r5 K) A6 s, Q" W
}
' `8 R8 \: d: j+ l4 \9 ?& B
</script>
% Y' E/ F# s$ l! e6 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