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以下分享一個PHP製作的圖片驗證碼案例：案比例如以：
運用PHP GD具體請看：http://www.php.net/manual/zh/book.image.php
後台圖片代碼例如以下：
<?phpsession_start();$image = imagecreatetruecolor(100,30);//建立一個寬100。高度30的圖片$bgcolor=imagecolorallocate($image,255,255,255);//圖片背景是白色imagefill($image,0,0,$bgcolor);//圖片填充白色//隨機數/**for($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,$fontcolor);}**///隨機資料$captch_code='';for($i=0;$i<4;$i++){ $fontsize=6; $fontcolor=imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120)); $data='asdfdfglfg74erf21854hgfhgfhkg4ljkghjtrtywiqpoqpwepdfgvnjytyut12313345645667686797800'; $fontcontent=substr($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['authcode']=$captch_code;//隨機點for($i=0;$i<200;$i++){ $pointcolor=imagecolorallocate($image,rand(50,120),rand(50,120),rand(50,120)); imagesetpixel($image,rand(1,99),rand(1,99),$pointcolor);}//隨機線for($i=0;$i<3;$i++){ $linecolor=imagecolorallocate($image,rand(80,220),rand(80,220),rand(80,220)); imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);}header("content-type:image/png");imagepng($image);imagedestory($image);?>
前台代碼例如以下：
<?php if(isset($_REQUEST['autocode'])){ session_start(); if(strtolower($_POST['autocode']) == $_SESSION['authcode']){ echo '正確'; }else{ echo'錯誤'; } exit(); }?><!DOCTYPE html><html> <head> <meta chartset="utf-8"> </head> <body> <form method="post" action="form.php"> <p>驗證碼圖片：<img border="1" src="captcha.php?r="<?php echo rand();?> width="100" height="30" /></p> <p>輸入內容：<input type="text" name="autocode" value="" /></p> <p><input type="submit" value="提交" style="padding:6px 20px;"/></p> </form> </body></html>
加入點擊運行改動例如以下就可以：
<p>驗證碼圖片：<img border="1" id="capthcha_img" onclick="this.src='captcha.php?r='+Math.random()" src="captcha.php?r="<?
php echo rand();?> width="100" height="30" /> <a href="javascript:void(0)" onclick="document.getElementById('capthcha_img').src='captcha.php?
r='+Math.random()">換一個</a></p>
PHP GD 產生圖片驗證碼+session擷取儲存驗證碼
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