PHP ??? ?? ??? ???? ???? PHP Ajax ?? ??
Jul 27, 2016 pm 04:56 PM??? ???? ???? ?? AJAX? ???? ?? ???? ?? ?? ??? ??? ??? ??, ?? ??? ???? ?? ? ???? ??? ?? ?? ?? ?????. ? 3?? ??? ?????.
yz.php: ????? ???? PHP ??? ??? ? ?? ? ????? ?? SESSION? ????. ??>
index .php:??? ???? HTML ??
loginCheck.php: ??? ??? ??? ??
yz.php ??
<?php session_start(); //生成驗(yàn)證碼圖 Header("Content-type: image/PNG"); //長(zhǎng)與寬 $im = imagecreate(44,18); // 設(shè)置背景色: $back = ImageColorAllocate($im, 245,245,245); // 填充背景色: imagefill($im,0,0,$back); srand((double)microtime()*1000000); $vcodes; //生成4位數(shù)字 for($i=0;$i<4;$i++){ $font = ImageColorAllocate($im, rand(100,255),rand(0,100),rand(100,255)); $authnum=rand(1,9); $vcodes.=$authnum; imagestring($im, 5, 2+$i*10, 1, $authnum, $font); } //加入干擾象素 for($i=0;$i<100;$i++){ $randcolor = ImageColorallocate($im,rand(0,255),rand(0,255),rand(0,255)); imagesetpixel($im, rand()%70 , rand()%30 , $randcolor); } ImagePNG($im); ImageDestroy($im); // 將四位的驗(yàn)證碼保存在 SESSION 里,登錄時(shí)調(diào)用對(duì)比 $_SESSION["VCODE"]=$vcodes; ?>index.php: ??? ? ???? $_SESSION["VCODE"]? ???? ???. ??? ??? ? ?? ?? ?? ??? ?????loginCheck.php?? ?????
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" c type="text/css" href="\css\a.css"> <style type="text/css"> <!-- #main{ font-family:宋體; font-size:10pt; text-align:center; margin-top:510px; } body{ background-attachment:fixed; background-position:center; background-image:url(./images/w2.jpg); background-repeat: no-repeat; } #authCode{background-Color:#F8F9FF;} table{text-align:center;} //--> </style> <script type="text/javascript" src="./js/trim.js"></script> <script type="text/javascript"> <!-- function clearX(){ document.getElementById('authCode').value=""; } // 點(diǎn)擊圖片重新獲得新的驗(yàn)證碼: function getVCode() { var vcode=document.getElementById('vcode'); vcode.src ='yz.php?nocache='+new Date().getTime(); } //定義XMLHttpRequest對(duì)象 var xmlHttp; // 創(chuàng)建 XMLHttpRequest: function createXmlHttpRequest(){ var xmlHttp=null; try{ // Firefox, Opera 8.0+, Safari xmlHttp=new XMLHttpRequest(); }catch(e){ // Internet Explorer try{ xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){ xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp; } // AJAX 檢查登錄: 有密碼,要用POST 提交 function login(){ var authCode=trim(document.getElementById('authCode').value); var username=trim(document.getElementById('username').value); var password=trim(document.getElementById('password').value); if(username=="" || password=="" || authCode==""){ alert("請(qǐng)輸入用戶(hù)名和密碼和驗(yàn)證碼!"); return false; }else{ if(!xmlHttp) xmlHttp=createXmlHttpRequest(); var send_string="username="+username+"&password="+password+"&authCode="+authCode+"&fresh="+Math.random(); xmlHttp.open("POST","loginCheck.php",true); xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xmlHttp.send(send_string); xmlHttp. if(xmlHttp.readystate==4 && xmlHttp.status==200){ var answer=xmlHttp.responseText; if(answer=="ok") //跳轉(zhuǎn)到管理中心頁(yè)面 window.location.href="adminCenter.php"; else{ alert("用戶(hù)名密碼或驗(yàn)證碼不正確! 請(qǐng)重新輸入!"); document.getElementById('username').focus(); } } } } } //--> </script> </head> <body /></td> <td>密 碼:<input type="password" /></td> <td>驗(yàn)證碼:<input type="text" size="6" maxlength="4" value="驗(yàn)證碼" /></td> <td><img src="yz.php" alt=" PHP+Ajax驗(yàn)證碼驗(yàn)證用戶(hù)登錄" /></td> <td><input type="submit" value="登 錄" /></td> </tr> </table> </div> </body> </html>loginCheck.php
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<?php session_start(); include("../conn/connDB.php"); // 取得POST過(guò)來(lái)的參數(shù): $username=$_POST["username"]; $password=md5($_POST["password"]); $authCode=$_POST["authCode"]; $feedback="no"; //對(duì)比是否==SESSION中的驗(yàn)證碼,不能放在客戶(hù)端做,否則取不正確的值 if($authCode==$_SESSION["VCODE"]){ $SQL="select * from users where username='$username' and password='$password'"; $result=mysql_query($SQL); $rows=mysql_num_rows($result); if($rows==1) // 驗(yàn)證成功 $feedback="ok"; $_SESSION["admin"]=true; //為了后臺(tái)安全,存入SESSION,表明 ADMIN 已登錄,供后面調(diào)用 } echo $feedback; ?>? ??? ??? ??? ??? ??? ???, ??? ? ???? ?????? ????.

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PHP ?? ??? ?? ???? ?? ? ????? ??? ?????. 1. ?? ??? ??? ??? ??? ? ? ??? ??? ??? ?? ?? ??? ???? ???????. 2. ?? ??? ???? ???? ? ?? ????? ?? ?? ?? ??? ?????. 3. $ _get ? $ _post? ?? Hyperglobal ??? ?? ???? ?? ??? ? ??? ??? ??????? ???????. 4. ?? ?? ?? ???? ?? ?? ?? ??? ?????? ?? ??? ??? ?? ??? ???????. ??? ??? ????? ??? ??? ?? ???? ????? ? ??? ? ? ????.

PHP ?? ???? ???? ????? ?? ? ??? ???? ?? ?? ? ??? ???? ?? ??? ?????? ??? ??? ? ? ???????. 1. ??? ?? CSRF? ???? ?? ??? ??? ???? ?????? ??? ???? FINFO_FILE? ?? ?? MIME ??? ?????. 2. ??? ??? ??? ???? ??? ?? ??? ?? ? WEB ????? ??? ???? ??????. 3. PHP ?? ??? ?? ? ?? ???? NGINX/APACHE? ??? ????? ?? ???? ?????. 4. GD ?????? ??? ? ?? ???? ??? ?? ??? ?? ????.

PHP ?? ???? ? ?? ???? ??? ????. 1. // ?? #? ???? ? ?? ??? ???? // ???? ?? ????. 2. ?? /.../ ?? ?? ?? ??? ????? ?? ? ?? ??? ?? ? ? ????. 3. ?? ?? ?? / if () {} /? ?? ?? ??? ????? ??? ?? ?? ?? ??? ???? ????? ???? ??? ?? ???? ???? ??? ? ??? ??????.

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PHP ??? ???? ??? ??? ??? ????? ????. ??? ????? ?? ???? ??? "?? ? ?"??? "?"? ???????. 1. ??? ? ??? ??? DocBlock (/*/)? ?? ?? ??? ???? ??? ? ?? ???? ??????. 2. JS ??? ???? ?? ???? ??? ?? ??? ??? ?????. 3. ??? ?? ?? ?? ??? ???? ????? ????? ???? ?? ????? ???? ? ??????. 4. Todo ? Fixme? ????? ???? ? ? ??? ??? ???? ?? ?? ? ??? ???????. ??? ???? ?? ??? ??? ?? ?? ?? ???? ???? ? ????.

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PHP??? ???? ??? ?? ?? ????? ???? ??? ?? ??? ??? ?? ? ??? ??? ???? ?????. ???? 0?? ???? ?? ??? ???? ? ?? ???? ?? ?? ? ? ????. MB_SUBSTR? ?? ??? ??? ???????. ? : $ str = "hello"; echo $ str [0]; ?? H; ??? MB_SUBSTR ($ str, 1,1)? ?? ??? ??? ??? ??????. ?? ???????? ???? ??? ???? ?? ???? ?? ?? ???? ?????? ??? ????? ?? ??? ?? ??? ???? ???? ?? ????.

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