Hello friends,

Today we will discuss how to validate an integer within a range. In PHP, filter_var() function is used for this purpose. It will check whether an integer exist within a range or not.

Syntax:

filter_var(var, filtername, options)

var: var is a variable name that we need to check. It is a required parameter.

filtername: It is the name of the filter which is by default FILTER_DEFAULT that is no filtering. It is an optional parameter. In this case, we will use FILTER_VALIDATE_INT which is used to validate an integer.

options: options must be defined as an associative multidimensional array named as options. Some of them are as follows:

• min_range - It define minimum value of an integer
• max_range - It defines maximum value of an integer
• FILTER_FLAG_ALLOW_OCTAL - It only allows octal number values
• FILTER_FLAG_ALLOW_HEX - It only allows hexadecimal number values

Example:

<?php
$int = 20;
$min = 11;
$max = 300;
$options=array("options" => array("min_range"=>$min, "max_range"=>$max));
if (filter_var($int, FILTER_VALIDATE_INT, $options) === false) {
	echo("Variable value is not within the legal range");
} else {
	echo("Variable value is within the legal range");
}
?> 

Output of above example is as follows:

Variable value is within the legal range