This function checks whether a variable is of type integer or not.

1. Code:

  <?php
	function checkValueIsInterger($var){
		return filter_var($var, FILTER_VALIDATE_INT);
	}  
	var_dump(checkValueIsInterger(1));
	echo "<br>";
	var_dump(checkValueIsInterger('a'));
?> 

2. Example:

Input:

input: 1
input: 1.2

Output:

output: true
output: false