//mb_substr(str,index,length,type) 切割字串
mb_substr('勇者是魔王',0,2,'utf-8');	//勇者
mb_substr('ABCDE',0,2,'utf-8');		//AB
//substr(str,index,length) 切割字串
substr('勇者是魔王',0,2,'utf-8');	//中文會變為亂碼
substr('ABCDE',0,2);				//AB
//strrchr(str,cutStr) 從最後一次出現的cutStr切割
strrchr('勇者H...是魔王.html','.');	//.html
//strstr(str,cutStr) or strchr(str,cutStr) 從第一次出現的cutStr切割
strstr('勇者H...是魔王.html','.');	//...是魔王.html
strstr('勇者H...是魔王.html','h');	//html
//stristr(str,cutStr) 和strstr一樣,但沒有區分大小寫
stristr('勇者H...是魔王.html','h');	//H...是魔王.html
//str_replace(targetStr,newStr,str) 取代字串
str_replace('勇者H','戰士A','勇者H...是魔王.html');	//戰士A...是魔王.html
//str_ireplace(targetStr,newStr,str) 同str_replace一樣,但是不區分大小寫
str_ireplace('勇者h','戰士A','勇者H...是魔王.html');	//戰士A...是魔王.html
//str_pad(str,length,padStr[,padType])
str_pad('50',4,'0');					//5000
str_pad('50',4,'0',STR_PAD_LEFT);		//0050
str_pad('50',4,'0',STR_PAD_RIGHT);	//5000
str_pad('50',4,'0',STR_PAD_BOTH);	//0500
str_pad('50',5,'0',STR_PAD_BOTH);	//05000 (沒有兩邊剛好,右邊先補)
                    Link is http://megull.idv.tw/MegullWorld/php/字串函數/Tags is php,strrchrPush to Create at 2011-05-12 01:04:55, Revise at 2011-05-21 15:51:56