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

 "; echo rtrim(" 空格 ")."
"; echo ltrim(" 空格 ")."
"; ?>

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:

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