PHP 删除字符串中的空格

删除字符串中所有的空格

<?php

//删除所有空格
echo str_replace(' ', '', ' a bab  ');echo "\n";
echo preg_replace('/ /', '', '   ab  ab  ');echo "\n";
echo strtr('    ab    ab    ', array(' '=>''));echo "\n";

function trimall($str)//删除所有的空格
{
$qian=array(" ","　","\t","\n","\r");
$hou=array("","","","","");
return str_replace($qian,$hou,$str);
}

echo trimall(" a  v  ");
echo "\n";
?>

只删除字符串左右两端的空格

ltrim、rtrim进行替换

/删除左右两边的空格，字符串中间包含的空格不做处理
//使用PHP自带的函数
$str="   脚本之家      提供大量优秀脚本及素材供读者下载     ";
echo ltrim($str);
echo "\n";
echo ltrim($str," ");
echo "\n";
echo rtrim($str);
echo "\n";
echo rtrim(ltrim($str," ")," ");
echo "\n";

正则表达式进行替换

//使用正则表达式替换
$str="    脚本之家      www.jb51.net     ";
$str = preg_replace('/^( )+/', '', $str);
echo $str."\n";
$str = preg_replace('/( )+$/', '', $str);
echo $str;