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本篇內(nèi)容主要講解“PHP怎么編寫登錄驗(yàn)證碼功能”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實(shí)用性強(qiáng)。下面就讓小編來帶大家學(xué)習(xí)“PHP怎么編寫登錄驗(yàn)證碼功能”吧!
本文實(shí)例為大家分享了一個(gè)PHP寫的登錄驗(yàn)證碼功能,供大家參考,具體內(nèi)容如下
ShowKey.php
<?php session_start(); //設(shè)置COOKIE或Session function esetcookie($name,$str,$life=0){ //本函數(shù)將字符串 str 全部變小寫字符串使驗(yàn)證碼輸入不區(qū)分大小寫----在提交表單進(jìn)行session比較同樣需要次函數(shù)轉(zhuǎn)化 $_SESSION[$name]=strtolower($str); } //獲取隨機(jī)字符 此函數(shù)區(qū)分字符大小寫 如果不區(qū)分大小寫可加入函數(shù)strtolower function domake_password($len) { $chars = array( /*"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",*/ "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" ); $charsLen = count($chars) - 1; shuffle($chars);// 將數(shù)組打亂 $output = ""; for ($i=0; $i<$len; $i++) { $output .= $chars[mt_rand(0, $charsLen)]; //獲得一個(gè)數(shù)組元素 } return $output; } //顯示驗(yàn)證碼 function ShowKey(){ $key=domake_password(4);//獲取隨機(jī)值 $set=esetcookie("checkkey",$key);//將隨機(jī)值寫入cookie或session //是否支持gd庫 if(function_exists("imagejpeg")) { header ("Content-type: image/jpeg"); $img=imagecreate(47,20); $blue=imagecolorallocate($img,102,102,102); $white=ImageColorAllocate($img,255,255,255); $black=ImageColorAllocate($img,71,71,71); imagefill($img,0,0,$blue); imagestring($img,5,6,3,$key,$white); for($i=0;$i<90;$i++) //加入干擾象素 { imagesetpixel($img,rand()%70,rand()%30,$black); } imagejpeg($img); imagedestroy($img); } elseif (function_exists("imagepng")) { header ("Content-type: image/png"); $img=imagecreate(47,20); $blue=imagecolorallocate($img,102,102,102); $white=ImageColorAllocate($img,255,255,255); $black=ImageColorAllocate($img,71,71,71); imagefill($img,0,0,$blue); imagestring($img,5,6,3,$key,$white); for($i=0;$i<90;$i++) //加入干擾象素 { imagesetpixel($img,rand()%70,rand()%30,$black); } imagepng($img); imagedestroy($img); } elseif (function_exists("imagegif")) { header("Content-type: image/gif"); $img=imagecreate(47,20); $blue=imagecolorallocate($img,102,102,102); $white=ImageColorAllocate($img,255,255,255); $black=ImageColorAllocate($img,71,71,71); imagefill($img,0,0,$blue); imagestring($img,5,6,3,$key,$white); for($i=0;$i<90;$i++) //加入干擾象素 { imagesetpixel($img,rand()%70,rand()%30,$black); } imagegif($img); imagedestroy($img); } elseif (function_exists("imagewbmp")) { header ("Content-type: image/vnd.wap.wbmp"); $img=imagecreate(47,20); $blue=imagecolorallocate($img,102,102,102); $white=ImageColorAllocate($img,255,255,255); $black=ImageColorAllocate($img,71,71,71); imagefill($img,0,0,$blue); imagestring($img,5,6,3,$key,$white); for($i=0;$i<90;$i++) //加入干擾象素 { imagesetpixel($img,rand()%70,rand()%30,$black); } imagewbmp($img); imagedestroy($img); } else { //不支持驗(yàn)證碼 header("content-type:image/jpeg\r\n"); header("Pragma:no-cache\r\n"); header("Cache-Control:no-cache\r\n"); header("Expires:0\r\n"); $fp = fopen("data/vdcode.jpg","r"); } } ShowKey(); ?>
調(diào)用方法:
復(fù)制代碼 代碼如下:
<img src="ShowKey.php" name="KeyImg" id="KeyImg" onClick="KeyImg.src='ShowKey.php?'+Math.random()">
到此,相信大家對(duì)“PHP怎么編寫登錄驗(yàn)證碼功能”有了更深的了解,不妨來實(shí)際操作一番吧!這里是億速云網(wǎng)站,更多相關(guān)內(nèi)容可以進(jìn)入相關(guān)頻道進(jìn)行查詢,關(guān)注我們,繼續(xù)學(xué)習(xí)!
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