How to remove all spaces from string in php?

In this post, use the PHP preg_replace() function to strip or remove all whitespaces inside a string.

1. Code:

<?php 
	function removeAllWhiteSpace($string){
		$string = trim($string);
		$string = preg_replace('/\s+/', '', $string);
		return $string;
	}
	$str = "Soltuts.com
      is providing      PHP 
      tutorials";
	echo(removeAllWhiteSpace($str));
    ?> 

2. Example:

Input:

$str ="Soltuts.com
      is providing      PHP 
      tutorials";

Output:

Soltuts.comisprovidingPHPtutorials