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Homephp教程php手册php中3种方法删除字符串中间的空格

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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