《PHP教程：PHP生成圖片驗(yàn)證碼功能示例》要點(diǎn)：
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PHP學(xué)習(xí)本文實(shí)例講述了PHP生成圖片驗(yàn)證碼功能.分享給大家供大家參考,具體如下：

PHP學(xué)習(xí)只是簡單的用隨機(jī)函數(shù)實(shí)現(xiàn)了圖片的生成,沒有對驗(yàn)證的整個(gè)流程做介紹.

PHP學(xué)習(xí)代碼如下：

PHP學(xué)習(xí)
<?php
/**
 * Created by JetBrains PhpStorm.
 * User: lee
 * To change this template use File | Settings | File Templates.
 */
header("content-type:image/png");
$validateLength=4;
$strToDraw="";
$chars=[
  "0","1","2","3","4",
  "5","6","7","8","9",
  "a","b","c","d","e","f","g",
  "h","i","j","k","l","m","n",
  "o","p","q","r","s","t",
  "u","v","w","x","y","z",
  "A","B","C","D","E","F","G",
  "H","I","J","K","L","M","N",
  "O","P","Q","R","S","T",
  "U","V","W","X","Y","Z"
];
$imgW=80;
$imgH=25;
$imgRes=imagecreate($imgW,$imgH);
$imgColor=imagecolorallocate($imgRes,255,255,100);
$color=imagecolorallocate($imgRes,0,0,0);
for($i=0;$i<$validateLength;$i++){
  $rand=rand(1,58);
  $strToDraw=$strToDraw." ".$chars[$rand];
}
imagestring($imgRes,5,0,5,$strToDraw,$color);
for($i=0;$i<100;$i++){
  imagesetpixel($imgRes,rand(0,$imgW),rand(0,$imgH),$color);
}
imagepng($imgRes);
imagedestroy($imgRes);

PHP學(xué)習(xí)運(yùn)行效果如下：

PHP學(xué)習(xí)

PHP學(xué)習(xí)PS：這里再為大家推薦幾款比較實(shí)用的圖片處理工具供大家參考使用：

PHP學(xué)習(xí)在線圖片轉(zhuǎn)換BASE64工具：
http://tools.jb51.net/transcoding/img2base64

PHP學(xué)習(xí)ICO圖標(biāo)在線生成工具：
http://tools.jb51.net/aideddesign/ico_img

PHP學(xué)習(xí)在線Email郵箱圖標(biāo)制作工具：
http://tools.jb51.net/email/emaillogo

PHP學(xué)習(xí)在線圖片格式轉(zhuǎn)換(jpg/bmp/gif/png)工具：
http://tools.jb51.net/aideddesign/picext

PHP學(xué)習(xí)更多關(guān)于PHP相關(guān)內(nèi)容感興趣的讀者可查看本站專題：《PHP圖形與圖片操作技巧匯總》、《PHP基本語法入門教程》、《PHP運(yùn)算與運(yùn)算符用法總結(jié)》、《php面向?qū)ο蟪绦蛟O(shè)計(jì)入門教程》、《PHP網(wǎng)絡(luò)編程技巧總結(jié)》、《PHP數(shù)組(Array)操作技巧大全》、《php字符串(string)用法總結(jié)》、《php+mysql數(shù)據(jù)庫操作入門教程》及《php常見數(shù)據(jù)庫操作技巧匯總》

PHP學(xué)習(xí)希望本文所述對大家PHP程序設(shè)計(jì)有所幫助.

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