How to remove spaces on both sides in php

Method: 1. Use the mb_ereg_replace function to remove, the syntax format is "mb_ereg_replace(regular expression, '', $str)"; 2. Use the trim function to remove whitespace characters on both sides of the string, the syntax format is is "rtrim(string," ")".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

The first method: through php’s own Function

trim() function removes whitespace characters or other predefined characters on both sides of a string.

<?php
$str = "Hello World!";
echo $str . "<br>";
echo trim($str,"Hed!");
?>

The second method: replace by regular expression, more powerful
php removes spaces at the beginning and end of the string (including full-width)

<?php
$str="　　　 　hello world 　　　　"; 
$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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