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搜尋一個年級的表,表中每一項為每個人的資訊的,還有班級欄位,顯然很多人對應著同一個班級,要求顯示班級資訊按人數多少降序排列的sql語句Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->$sql = "select ycid, count(*) as num from uch_ycuser group by ycid order by num desc"
======================================================substr ======================================================Return part of a string (PHP 3, PHP 4, PHP 5) string substr ( string string, int start [, int length] )substr() returns the portion of
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本文是第一篇,講述如何在PHP中執行系統命令從而實現一些特殊的目的,比如監控伺服器負載,重啟MySQL、更新SVN、重啟Apache等。第二篇《PHP監控linux伺服器負載》:http://www.ccvita.com/390.html首先先要給大家介紹PHP執行linux系統命令的幾個基本函數。我曾經很長一段時間都分不清下面幾個函數的具體用法區別。system函數說明:執行外部程式並顯示輸出資料。文法:string system(string command, int