第PHP實(shí)現(xiàn)隨機(jī)數(shù)字、字母的驗(yàn)證碼功能可自定義生成驗(yàn)證碼文字的大小、數(shù)量、干擾項(xiàng)等等，也可以自定義驗(yàn)證文字的字體。。。

廢話不多說(shuō)，直接上代碼：

1、classgd.class.php

ClassCaptcha{

private$_fontfile='';

private$_size=36;

private$_width=200;

private$_height=100;

private$_length=4;

private$_image=null;

private$_snow=0;

private$_pixel=0;

private$_line=0;

publicfunction__construct($config=array()){

if(is_array($config)count($config)0){

if(isset($config['fontfile'])is_file($config['fontfile'])is_readable($config['fontfile'])){

$this-_fontfile=$config['fontfile'];

}else{

returnfalse;

if(isset($config['size'])$config['size']0){

$this-_size=(int)$config['size'];

if(isset($config['width'])$config['width']0){

$this-_width=(int)$config['width'];

if(isset($config['height'])$config['height']0){

$this-_height=(int)$config['height'];

if(isset($config['length'])$config['length']0){

$this-_length=(int)$config['length'];

if(isset($config['snow'])$config['snow']0){

$this-_snow=(int)$config['snow'];

if(isset($config['pixel'])$config['pixel']0){

$this-_pixel=(int)$config['pixel'];

if(isset($config['line'])$config['line']0){

$this-_line=(int)$config['line'];

$this-_image=imagecreatetruecolor($this-_width,$this-_height);

return$this-_image;

else{

returnfalse;

publicfunctiongetCaptcha(){

$white=imagecolorallocate($this-_image,255,255,255);

imagefilledrectangle($this-_image,0,0,$this-_width,$this-_height,$white);

$str=$this-_generateStr($this-_length);

if(false===$str){

returnfalse;

$fontfile=$this-_fontfile;

for($i=0;$i$this-_length;$i++){

$size=$this-_size;

$angle=mt_rand(-30,30);

$x=ceil($this-_width/$this-_length)*$i+mt_rand(5,10);

$y=ceil($this-_height/1.5);

$color=$this-_getRandColor();

//針對(duì)中文字符截取

//$text=mb_substr($str,$i,1,'utf-8');

$text=$str{$i};

imagettftext($this-_image,$size,$angle,$x,$y,$color,$fontfile,$text);

if($this-_snow){

$this-_getSnow();

}else{

if($this-_pixel){

$this-_getPixel();

if($this-_line){

$this-_getLine();

header('content-type:image/png');

imagepng($this-_image);

imagedestroy($this-_image);

returnstrtolower($str);

privatefunction_getSnow(){

for($i=1;$i=$this-_snow;$i++){

imagestring($this-_image,mt_rand(1,5),mt_rand(0,$this-_width),mt_rand(0,$this-_height),'*',$this-_getRandColor());

privatefunction_getPixel(){

for($i=1;$i=$this-_pixel;$i++){

imagesetpixel($this-_image,mt_rand(0,$this-_width),mt_rand(0,$this-_height),$this-_getRandColor());

privatefunction_getLine(){

for($i=1;$i=$this-_line;$i++){

imageline($this-_image,mt_rand(0,$this-_width),mt_rand(0,$this-_height),mt_rand(0,$this-_width),mt_rand(0,$this-_height),$this-_getRandColor());

privatefunction_generateStr($length=4){

if($length1||$length30){

returnfalse;

$chars=array(

'a','b','c','d','e','f','g','h','k','m','n','p','x','y','z',

'A','B','C','D','E','F','G','H','K','M','N','P','X','Y','Z',

1,2,3,4,5,6,7,8,9

$str=join('',array_rand(array_flip($chars),$length));

return$str;

privatefunction_getRandColor(){

returnimagecolorallocate($this-_image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

2、testCaptcha.php

require_once'classgd.class.php';

$config=array(

'fontfile'='fonts/simfang.ttf',//引入字體文件

//'snow'=5