验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
8 u1 I: N" h$ o- c" A# u3 m
session_start();$ ~' \3 l; A! p; |# {8 d! K3 y9 g
// 丢弃输出缓冲区的内容 **. D9 |9 B% B8 W/ l; }* _1 z
ob_clean();
- w, r- Z" ~) I) r
header ('Content-Type: image/png');
% _2 m% d' i% V9 r
// 1 创建画布+ C4 c) z8 E' n C) v- T
$image=imagecreatetruecolor(100, 30);
3 }. B( e& g5 K, f4 e
// 2 画一个矩形并填充背景颜色为白色
) v/ Q! l+ a9 w* Y0 ^/ \
$color=imagecolorallocate($image, 255, 255, 255);
1 B- s3 ]6 v, e- s4 s& M
imagefill($image, 20, 20, $color);
, T9 e) p+ S5 F+ p! P
// for($i=0;$i<4;$i++){
9 i. E1 d u: H7 f5 E% t$ \
// $font=6;' P4 X. B& J/ p5 o, H* S
// $x=rand(5,10)+$i*100/4;
5 Q' i. t% b3 b. }2 n
// $y=rand(8, 15);- y1 y2 b2 x5 B8 G
// $string=rand(0, 9);
' \" l- H% z* w3 Q% `$ S
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
- k2 y0 b) d- e3 ]0 L9 X' a
// imagestring($image, $font, $x, $y, $string, $color);, y0 `8 K! D- B$ e& z+ p& u' S. ~
// }0 T6 F7 ]1 s5 f5 \9 K3 o
$code='';4 w! R2 A7 [6 o& q! L7 S# n
for($i=0;$i<4;$i++){/ W* V. G! \0 C6 ~+ Z" ?9 A1 H
$fontSize=8;
2 Z. E' J7 h0 T9 |- V+ J4 n, z6 ~0 ~
$x=rand(5,10)+$i*100/4;
# p- h, d6 L& }. ]3 D. c) q
$y=rand(5, 15);
: ^, K8 X! I, D0 c( t1 {
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
3 n+ R3 j* y2 ]4 D( o* _
$string=substr($data,rand(0, strlen($data)),1);7 H3 O% p3 @# ^/ P4 v
$code.=$string;
, [$ d0 }* Y% C1 A0 D: l
// 3.2 加载自定义字体
" y2 o, H0 t$ @' T% M& f& U. D
$font_file = '1.ttf';- {7 h8 ^+ P; o) \' e
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));$ x: |1 I/ n ?6 ]
// 把文字填充到画布
1 J% u* v) I+ p B) L
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
( F# e1 \- D* k, {
imagestring($image, $fontSize, $x, $y, $string, $color);
e+ p# M! Q# s/ I3 B& m" ]* f
}& I! Y+ l5 G+ {; I! s( W; A
$_SESSION['code']=$code;//存储在session里
) O3 P& u+ t, |. r
for($i=0;$i<200;$i++){. k$ |& K: e& n! h, L; w
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));: x B, a4 C! Y1 Q+ \
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
9 t# }9 {* Q# a# }% M' R5 j
}
# ~) i3 {' |0 y9 W7 q/ ]# l
for($i=0;$i<2;$i++){
! {( R& ?+ f# ^' o; g' H
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
: j% X* ^! X- R. W6 n+ W: U/ ?" a
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
5 F* l! W* T" I# g7 Y
}
0 e+ d$ l# H: f8 `+ B; G
imagepng($image);+ B, Y* X) O6 d. V
imagedestroy($image);. x; Y4 K8 Z |/ x. m; D4 v* S% y
7 ]+ Y; B6 p# ]$ ~$ r
?>

复制代码

form.php

<?php
/ k/ Z. S0 P6 y! q# u6 `+ H# {
if(isset($_REQUEST['code'])){; R7 C, Y1 b6 N/ n# i3 E. |' F
session_start();
+ H. e* j8 L6 e3 A! }& u% V1 l
if($_REQUEST['code']==$_SESSION['code']){) Z( R7 U) i$ ~ y1 \; j+ e. T
echo "<font color='red'>输入正确</font>";+ W/ W) V G- B
}else{( r- d: A* H& B/ t* j- Y# q
echo "<font color='red'>输入错误</font>";
5 t& k7 S8 o$ t: z& D/ L
}, L+ m, y/ r. g: w/ W' z
}
% T: w# h! b. E5 Z9 ]: `- t
?> v! G: T& P( y$ }% Q/ b
<!DOCTYPE html>- ]( |8 W# N0 X5 m
<html>
- C) h) m" I6 |; B/ ]
<head>
; r9 H8 m5 W- n' e* N' W
<meta chartset="UTF-8" />
1 x' l# ~: q c! J
<style type="text/css" rel="stylesheet">' f _6 j, D4 `/ a5 t L& l7 j* H
a{
8 S! }( w$ r1 }7 ?) h: S) |
text-decoration:none;" a4 \0 E* k$ p6 k- w2 C" k
font-size:30px;- A3 j/ X5 T) A# q+ ^
color:blue;3 l/ C7 w3 m' P9 N( N5 O5 ~* Y$ T }
}
7 h" s1 X/ _2 E
a:hover{
8 k4 k' y* T& f, q- }9 s
text-decoration:underline;
3 \9 p: w! x8 a6 m9 z# Y( U5 a2 F2 F
} B9 p; M8 i( f' U
</style>, L! A2 z! ~9 c- E
</head>
# H' z( I! Y+ w& Z* e
<body>
7 R) a8 o& c; |( @: Q4 T
<form action="form.php" method="get">; m# w6 \* I3 x2 ~( R8 Q% B& ]* C
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>9 ^ S: {9 h' g) r3 }8 F6 ?! l% j
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
1 g8 `- u0 f( z, k. U
请输入验证码: <input name="code" /><br />9 z# q% C% Z9 l. F2 q" L
<input type="submit" value="提交" />
" e0 ~9 Y, b% @& r* o2 s3 X; B+ H
</form>
# h" f1 x$ ]# a" _! s( }) z
</body>5 C5 w. k" ?0 P8 T/ S
<script type="text/javascript">
' e# Z: V5 ?$ ?* t u
$ k# c8 ~5 Y$ n' J) d1 Y
function changeCode(){
/ o: `, a% Q/ o4 J: T
var img=document.getElementById('img');% ~/ t) I# V9 P
//img.src='index.php?r='+Math.random();1 ? ], n. \3 m. W2 y% S! \% T. d
img.setAttribute('src','index.php?r='+Math.random());+ B2 y7 w F9 B* n. p# M
}7 E9 ?, A. t- X- [9 ^3 F: j
</script> Q* [2 `* ^+ k5 r5 g3 P
</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