How to remove leading and trailing spaces from a string in PHP

How to remove the leading and trailing spaces of a string in PHP: 1. Use the function [trim] function, the code is [echo trim("space")."
"]; 2. Replace with regular expressions , the code is [$str = mb_ereg_replace('(|) $', '', $str].

First method: Pass PHP’s built-in function

<?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: replace with regular expression, more powerful

php removes spaces at the beginning and end of the string (including full-width )

The code is as follows:

<?
$str="　　　 　脚本之家 www.jb51.net 　　　　";
$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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