PHP去除字符串中的所有空格及在每个字符前后加下‘%’

function str_split_unicode($str, $l = 0) {     if ($l > 0) {         $ret = array();         $len = mb_strlen($str, "UTF-8");         for ($i = 0; $i < $len; $i += $l) {             $ret[] = mb_substr($str, $i, $l, "UTF-8");         }         return $ret;     }     return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY); } $str = '  z   十   三';echo strlen($str),'--strlen','<br>';echo mb_strlen($str, 'utf-8'),'--mb_strlen','<br>';$arrstr = str_split($str);$arrstr = str_split_unicode($str);//符合要求$temp='';foreach ($arrstr as $val){	$temp.= trim($val);}echo $temp, '<br>';//符合要求，去除空格后的字符串$arrstr = str_split_unicode($temp);//符合要求$temp='%';foreach ($arrstr as $val){	$temp.=$val.'%';}echo $temp,'<br>';//符合要求，加上‘%’后的字符串echo mb_strlen($temp),'<br>';echo mb_strlen($temp, 'utf-8');//符合要求

/** *  */package cn.com.songjy.demo;/** * @author songjianyong * */public class LikeSqlConditionDemo {			public static void main(String[] args) {		System.out.println(getLikeSqlCondition("   aa  a d   "));//输出结果是：%a%a%a%d%			}		public static String getLikeSqlCondition(String condition){		if(condition==null || condition.trim().length()==0)			return null;				condition = trim(condition);//去除空格				String[] str = condition.split("");		String temp = "";		for (String string : str) {			temp+=string+"%";		}				return temp;	}		public static String trim(String str){		String temp = "";		for(int i=0; i<str.length(); i++){			temp = (new StringBuilder()).append(temp).append(str.substring(i, i+1).trim()).toString();		}		return temp;	}}