php 不重新整理頁面，點擊重新整理驗證碼

最後更新：2018-07-24 來源：互聯網

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code.php

<?phpHeader("Content-type: image/gif");/** 初始化*/$border = 0; //是否要邊框 1要:0不要$how = 4; //驗證碼位元$w = $how*15; //圖片寬度$h = 20; //圖片高度$fontsize = 6; //字型大小$alpha = "abcdefghjkmnpqrstuvwxyz"; //驗證碼內容1:字母$number = "23456789"; //驗證碼內容2:數字$randcode = ""; //驗證碼字串初始化srand((double)microtime()*1000000); //初始化隨機數種子$im = ImageCreate($w, $h); //建立驗證圖片/** 繪製基本架構*/$bgcolor = ImageColorAllocate($im, 255, 255, 255); //設定背景顏色ImageFill($im, 0, 0, $bgcolor); //填充背景色if($border){    $black = ImageColorAllocate($im, 0, 0, 0); //設定邊框顏色    ImageRectangle($im, 0, 0, $w-1, $h-1, $black);//繪製邊框}/** 逐位產生隨機字元*/for($i=0; $i<$how; $i++){       $alpha_or_number = mt_rand(0, 1); //字母還是數字    $str = $alpha_or_number ? $alpha : $number;    $which = mt_rand(0, strlen($str)-1); //取哪個字元    $code = substr($str, $which, 1); //取字元    $j = !$i ? 4 : $j+15; //繪字元位置    $color3 = ImageColorAllocate($im, mt_rand(0,100), mt_rand(0,100), mt_rand(0,100)); //字元隨即顏色    ImageChar($im, $fontsize, $j, 3, $code, $color3); //繪字元    $randcode .= $code; //逐位加入驗證碼字串}/** 添加幹擾*/for($i=0; $i<10; $i++)//繪背景幹擾線{       $color1 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //幹擾線顏色    ImageArc($im, mt_rand(-5,$w), mt_rand(-5,$h), mt_rand(20,300), mt_rand(20,200), 55, 44, $color1); //幹擾線}  /*for($i=0; $i<$how*40; $i++)//繪背景幹擾點{       $color2 = ImageColorAllocate($im, mt_rand(0,255), mt_rand(0,255), mt_rand(0,255)); //幹擾點顏色     ImageSetPixel($im, mt_rand(0,$w), mt_rand(0,$h), $color2); //幹擾點}*///把驗證碼字串寫入sessionsession_start();$_SESSION['randcode'] = $randcode;/*繪圖結束*/Imagegif($im);ImageDestroy($im);/*繪圖結束*/?>

<?php /* * * */ session_start(); if($_POST[sub]){ //if(!empty($_POST[gd_pic])){//判斷驗證碼是否相同 if($_POST[gd_pic]==$_SESSION[randcode]){ echo "驗證成功。"; }else{ echo "驗證碼錯誤"; } } ?> <html xmlns="http://www.w3.org/1999/xhtml"><head>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <title>驗證碼測試</title><script>           function formSubmit(){    document.actionForm.action = "login.php";                document.actionForm.submit();            }  </script></head><body><form name="actionForm" action="login.php" method="POST"> 驗證碼：<input type="text" name="gd_pic"/><img src="code.php" onClick="this.src='code.php'"/><br> <input type="submit" name="sub" value="submit"/> <a href="javascript:formSubmit()" name="sub">發布</a></form> </body></html>

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