How to remove spaces on both sides of a string in php?

php method to remove spaces on both sides of a string: 1. Directly use the trim() function to remove spaces at both ends of a string; 2. Use rtrim() and ltrim() to remove the right and left sides of a string respectively. Spaces; 3. Use the mb_ereg_replace() function with regular expressions to replace and remove spaces.

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php removes spaces on both sides of the string

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。
*/

$str = " Hello World! ";
echo trim($str)."<br>";
echo rtrim($str)."<br>";
echo ltrim($str)."<br>";
?>

The second method: through regular expression Formula replacement, more powerful

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

<? 
$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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