PHP example code for removing leading and trailing spaces from a string

When I was doing php today, I needed to remove the spaces at the beginning and end of the string. Baidu found out that php comes with this functiontrim. It is really much more convenient. I would like to share it

The first method: through the function that comes with php

<?php 
/* 
trim 去除一个字符串两端空格， 
rtrim 是去除一个字符串右部空格， 
ltrim 是去除一个字符串左部空格。 

*/ 
?> 
<?php 
echo trim(" 空格 ")."<br>"; 
echo rtrim(" 空格 ")."<br>"; 
echo ltrim(" 空格 ")."<br>"; 
?>

The second method: through regular expressionreplacement, with stronger function
php Remove leading and trailing spaces from the string (including full-width spaces)

The code is as follows:

<? 
$str="　　　 　PHP中文网www.php.cn　　　　"; 
$str = mb_ereg_replace(&#39;^(　| )+&#39;, &#39;&#39;, $str); 
$str = mb_ereg_replace(&#39;(　| )+$&#39;, &#39;&#39;, $str); 
echo mb_ereg_replace(&#39;　　&#39;, "\n　　", $str); 
?>

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