php验证码制作是对php基本功的考核,php验证码制作必需开启gd库,因为要用到gd库里面的不少函数

推荐学习PHP开发验证码教程

1.创建验证码底图

<?php $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,000,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

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2.实现数字验证码

<?php $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); for ($i=0;$i<4;$i++){ $fontsize = 6; $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $fontcontent = rand(0,9); $x = ($i * 100/4)+rand(5,10); $y = rand(5,10); imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); } header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

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3.增加干扰元素

<?php $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); for ($i=0;$i<4;$i++){ $fontsize = 6; $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $fontcontent = rand(0,9); $x = ($i * 100/4)+rand(5,10); $y = rand(5,10); imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); } for($i=0;$i<200;$i++){ $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200)); imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor); } header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

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4.字母和数字混合验证码

<?php $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); for ($i=0;$i<4;$i++){ $fontsize = 6; $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $data='abcdefghijklmnopqrstuvwxyz1234567890'; $fontcontent=substr($data,rand(0,strlen($data)),1); $x = ($i * 100/4)+rand(5,10); $y = rand(5,10); imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); } for($i=0;$i<200;$i++){ $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200)); imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor); } for($i=0;$i<8;$i++){ $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220)); imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor); } header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

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5.使用session存储验证信息

<?php session_start(); $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); $captch_code=""; for ($i=0;$i<4;$i++){ $fontsize = 6; $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $data='abcdefghijklmnopqrstuvwxyz1234567890'; $fontcontent=substr($data,rand(0,strlen($data)),1); $captch_code.="$fontcontent"; $x = ($i * 100/4)+rand(5,10); $y = rand(5,10); imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); } $_SESSION['code']=$captch_code; for($i=0;$i<200;$i++){ $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200)); imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor); } for($i=0;$i<8;$i++){ $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220)); imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor); } header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

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6.验证码的使用

<?php session_start(); $image = imagecreatetruecolor(100,30); $bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF imagefill($image,0,0,$bgcolor); $captch_code=""; for ($i=0;$i<4;$i++){ $fontsize = 6; $fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $data='abcdefghijklmnopqrstuvwxyz1234567890'; $fontcontent=substr($data,rand(0,strlen($data)),1); $captch_code.="$fontcontent"; $x = ($i * 100/4)+rand(5,10); $y = rand(5,10); imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor); } $_SESSION['code']=$captch_code; for($i=0;$i<200;$i++){ $pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200)); imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor); } for($i=0;$i<5;$i++){ $linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220)); imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor); } header('content-type: image/png'); imagepng($image); //销毁 imagedestroy($image); ?>

课程链接:

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