How to validate a variable is phone number in Php?

In this post, This function checks whether a variable is phone number or not.

1. Code:

  <?php
	function checkIsPhoneNumber($var){
		return preg_match('/^[0-9\(\)\-\[\]\.\+\s]+$/', $var);
	} 
	var_dump(checkIsPhoneNumber("0988888887"));
	echo "<br>";
	var_dump(checkIsPhoneNumber("soltuts.com"));
?> 

2. Example:

Input:

Input: "0988888887"
Input: "soltuts.com"

Output:

Output: true
Output: false