第一种:使用正则
复制代码 代码如下:
echo preg_replace('# #', '', 'ab ab');
//输出 "abab"
?>
第二种:使用str_replace()函数
复制代码 代码如下:
echo str_replace(' ', '', 'ab ab');
//输出 "abab'
?>
第三种:使用strtr()函数
复制代码 代码如下:
echo strtr('ab ab', array(' '=>''));
// 输出 "abab"
?>
strtr()函数使用上有点特别,实质上:
复制代码 代码如下:
strtr('ewb', 'web', '123') ==
strtr('ewb', array('e '=> '2', 'w' => '1', 'b' => '3')) ==
str_replace(array('e', 'w', 'b'), array('2', '1', '3'), 'ewb');
?>
第四种:使用封装函数
复制代码 代码如下:
function trimall($str)//删除空格
{
$qian=array(" "," ","\t","\n","\r");
$hou=array("","","","","");
return str_replace($qian,$hou,$str);
}

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