
什么是哈希hash 算法
ec(2); 哈希(Hash)表 一般的查找方法基于比較的,查找效率依賴比較次數(shù),其實(shí)理想的查找希望不經(jīng)比較,一次存取便能得到所查 記錄,那就必須在記錄的存儲(chǔ)位置和它的關(guān)鍵字之間建立一個(gè)確定的對(duì)應(yīng)關(guān)系f,這樣查找k時(shí),只要根據(jù)這個(gè) 對(duì)應(yīng)關(guān)系f找到給定值k的像f(k)。這種對(duì)應(yīng)關(guān)系f叫哈希(hash)函數(shù)。按這種思想建立的表叫哈希表(也 叫散列表)。哈希表存取方便但存儲(chǔ)時(shí)容易沖突(c
Jun 08, 2016 pm 05:29 PM
mysqli的異常處理功能?
ec(2); mysqli的異常處理功能? class check{ private $host; &
Jun 08, 2016 pm 05:29 PM
php 域名轉(zhuǎn)發(fā)程序
ec(2); php 域名轉(zhuǎn)發(fā)程序是我從其它地方看到了,通過(guò)xml與php交換實(shí)現(xiàn)的,下面我們來(lái)看看源文件吧。 1
Jun 08, 2016 pm 05:29 PM
php Rmdir刪除文件目錄代碼
ec(2); php Rmdir刪除文件目錄代碼 class del_path { function wm_chief_delpath($del_path) { if(!file_exists($del_path))//目標(biāo)目錄不存在則建立 {echo"Directory not found.";return false;} $ha
Jun 08, 2016 pm 05:29 PM
php 采集遠(yuǎn)程服務(wù)器圖片文件
ec(2); class GetImage { var $source; var $save_to; var $quality; function download($method = 'curl') { $info = @GetImageSize($this->source);
Jun 08, 2016 pm 05:29 PM
php 修復(fù)表與優(yōu)化數(shù)據(jù)表
ec(2); php 修復(fù)表與優(yōu)化數(shù)據(jù)表 //--------------------------修復(fù)表 function Ebak_Rep($tablename,$dbname){ global $empire; $dbname=RepPostVar($dbname); $empire->query("use `$dbname`&quo
Jun 08, 2016 pm 05:29 PM
php 字符串函數(shù)教程與實(shí)例代碼
在php中字符串函數(shù)有很多哦,在說(shuō)了php本來(lái)就是由函數(shù)組成了,這讓開(kāi)發(fā)人員可以加快網(wǎng)站的開(kāi)發(fā)速度哦,好了費(fèi)話不說(shuō)多了我們來(lái)看看我為各位朋友免費(fèi)提供的php 字符串函數(shù)教程與實(shí)例代碼吧。
Jun 08, 2016 pm 05:29 PM![php 創(chuàng)建數(shù)據(jù)[crate database]與清空數(shù)據(jù)表](/static/imghw/default1.png)
php 創(chuàng)建數(shù)據(jù)[crate database]與清空數(shù)據(jù)表
ec(2); php 創(chuàng)建數(shù)據(jù)[crate database]與清空數(shù)據(jù)表 function Ebak_CreatDb($dbname,$dbchar=''){ global $empire,$phome_db_ver; $dbname=RepPostVar($dbname); if(!trim($dbname)) {  
Jun 08, 2016 pm 05:29 PM
mysql 數(shù)據(jù)庫(kù)連查詢類
ec(2); mysql 數(shù)據(jù)庫(kù)連查詢類 class mysqlquery { var $sql;//sql語(yǔ)句執(zhí)行結(jié)果 var $query;//sql語(yǔ)句 var $num;//返回記錄數(shù) var $r;//返回?cái)?shù)組 var $id;//返回?cái)?shù)據(jù)庫(kù)id號(hào) //執(zhí)行mysql_query()語(yǔ)句 func
Jun 08, 2016 pm 05:29 PM
php 入門篇-如何判斷mysql數(shù)據(jù)庫(kù)連接成功
ec(2); php 入門篇-如何判斷mysql數(shù)據(jù)庫(kù)連接成功
Jun 08, 2016 pm 05:29 PM
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