验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php6 |) y4 V1 P% `1 `/ f% B; m" h
session_start();
' |# f' `& W1 _4 M& C9 g" s; d
// 丢弃输出缓冲区的内容 **7 E% |& Z+ K! ?( z6 U3 _9 W
ob_clean();
. i- W" r6 [! x( D+ i( X* i
header ('Content-Type: image/png');. ~- t% n D5 a; K5 _6 a9 R
// 1 创建画布1 Q( L- V2 N0 ]. w$ t
$image=imagecreatetruecolor(100, 30);/ Y) B/ N( q* w% D2 K+ [
// 2 画一个矩形并填充背景颜色为白色
. G- X4 \. H% _/ r) [
$color=imagecolorallocate($image, 255, 255, 255);- ?& z: r$ g; u. l) r' l2 c1 x( h( v
imagefill($image, 20, 20, $color);, r K+ V1 ^- ]1 ~) G n# [: Y" {. V
// for($i=0;$i<4;$i++){
) P' K/ ~% e; \* F
// $font=6;
6 ^0 _7 M, l! j, d# g% y5 [4 S
// $x=rand(5,10)+$i*100/4;
" j5 g( v1 m! q
// $y=rand(8, 15);* |. h7 v: i2 c/ g; i
// $string=rand(0, 9);$ J2 j A0 d7 V' E
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
6 k7 A7 `1 R' B% @) ?
// imagestring($image, $font, $x, $y, $string, $color);
, c# ]7 Y0 w6 F4 q
// }
% E" R6 r% f! T! b' d) Q
$code='';
2 l( h r; a& K* O8 s/ D0 e( t
for($i=0;$i<4;$i++){
+ p1 u; V1 i( g* y4 T4 T- j
$fontSize=8;2 q2 S: n- Q, p5 s5 i* t
$x=rand(5,10)+$i*100/4;& }, G, o6 y6 V3 W W+ [& {( y; f
$y=rand(5, 15);
5 [7 D5 l- U9 Y' Q; y s3 }
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';1 a4 X$ c+ u; O) n, F
$string=substr($data,rand(0, strlen($data)),1);4 L+ ^) l2 r4 h6 H3 _
$code.=$string;: |# a$ @1 w0 d E3 \
// 3.2 加载自定义字体/ H o% f f6 q l5 a- w3 M
$font_file = '1.ttf';% L; c* L7 j* D& m
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));7 o9 M1 s; x$ k9 x: u' {
// 把文字填充到画布; |- Y7 Y+ ~1 @ T8 Z( o2 A3 w
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
2 w9 J' U* Q/ D z" X. \; D& f
imagestring($image, $fontSize, $x, $y, $string, $color);
. `& t* T& i, [7 A# U1 H: l2 D
}
! m+ z. T& ]( h8 M9 f2 |
$_SESSION['code']=$code;//存储在session里, I1 T9 E: O5 G; K: r0 \: i
for($i=0;$i<200;$i++){
( v2 p: Y' y! K8 L1 ?" X e' h* {2 w
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));9 L4 V0 ?) x! h/ S8 Q0 e
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
( s4 w( @, t! q. D
}
% k/ u1 i) m6 D( c# L+ Q2 b. ]
for($i=0;$i<2;$i++){
r$ W2 i' z2 Y
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
( Q" {( f5 K" C/ n7 U% @( ~, r, W" r5 C
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
" W7 T& B! P; o! [; R. C& A" @$ z
} B7 w8 G- m0 R) q- B) d7 o) x6 X
imagepng($image);* G$ w4 ~4 n: `$ o# ?
imagedestroy($image);
: Z$ c- ^& d% O4 h- r" y# |
/ R# d; f8 S+ W r& R
?>

复制代码

form.php

<?php
: |; D; d. b# N+ I# U
if(isset($_REQUEST['code'])){
/ I# U) b/ G3 P
session_start();3 U# V, T- U& z1 ]4 E
if($_REQUEST['code']==$_SESSION['code']){
" }$ ?& ~' g; q8 c
echo "<font color='red'>输入正确</font>";" ~% _9 R2 K9 k
}else{* r: C* {8 G* k$ I' m
echo "<font color='red'>输入错误</font>";
, n. }# F# T; e$ ^) K& X
}' E9 w g5 F7 P+ H7 H7 h; ~ V
}
. _" z6 c0 ^( S; i: N
?>8 W0 N5 y- T6 x' `; ]
<!DOCTYPE html>" R8 x E+ i1 l3 I A2 ]8 G
<html>
* q+ X# a( E/ C
<head>' }- B1 e& r" h/ L
<meta chartset="UTF-8" />
! K$ H$ L" \2 p7 H. t G
<style type="text/css" rel="stylesheet">* a+ d( @# G2 |" N& z$ x
a{9 e' Y6 B& n/ j. W
text-decoration:none;2 H1 s1 b8 i L& _' F9 {( A
font-size:30px;- M* L* i3 d2 { v# ^' E* ^ }5 O
color:blue; R, l r4 y8 o* q& R
}
5 l$ t) z5 B8 g2 d5 {' c
a:hover{
4 V' n4 L7 Z( j2 U) y' c
text-decoration:underline;4 {+ ^& n# Z6 |$ G: I
}
! v0 E- t) i6 W& A
</style>3 K$ g: l6 f- ^! l$ h( U
</head>
, `7 S4 t1 l/ Y2 u I0 b8 t
<body>
% \% _: O# v/ v+ b
<form action="form.php" method="get">- w+ @# ^8 f1 v' P) I2 ^% y
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
8 h: u; e+ |, H6 G
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
9 G, b9 s W+ L8 x. d& x1 ^
请输入验证码: <input name="code" /><br />( X* ]. A5 Q% b" o/ O* J. s
<input type="submit" value="提交" />: Q* y1 J& l' J: K/ a2 y5 g
</form>
6 {6 X0 v; Z9 _, J( g5 e' }- O* e
</body>% G! K7 @. Z! c" Q6 g
<script type="text/javascript">
i# z: b [" T, V% ]) \
/ ~- b2 U1 \, ?3 Y) U' g6 H0 E
function changeCode(){
7 k3 M Q3 b0 X2 g) M% i6 V3 b% N7 M
var img=document.getElementById('img');" i9 Y1 k# f- q( V& j
//img.src='index.php?r='+Math.random();
& A9 X4 d, C' n/ o6 u* z( E! L& m
img.setAttribute('src','index.php?r='+Math.random());
) ^7 ^/ Z1 F4 G. m5 \' A- \+ s
}/ ?0 }4 C y' V z6 f, l
</script>
2 h3 @& I, s H8 O* h
</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