PHP FILTER_VALIDATE_INT Filter

Example

Check if the variable $int is an integer:

<?php
$int = 0;

if (filter_var($int, FILTER_VALIDATE_INT)!== false) {
echo("Variable is an integer");
} else {
echo("Variable is not an integer");
}
?>

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Definition and Usage

The FILTER_VALIDATE_INT filter is used to validate value as integer.

FILTER_VALIDATE_INT also allows us to specify a range for the integer variable.

Possible options and flags:

min_range - specifies the minimum integer value
max_range - specifies the maximum integer value
FILTER_FLAG_ALLOW_OCTAL - allows octal number values
FILTER_FLAG_ALLOW_HEX - allows hexadecimal number values

Note: When specifying options in an array. The options must be in an associative multidimensional array with the name "options".

More Examples

Example

Check if a variable is both of type INT, and between 1 and 200:

<?php
$int = 122;
$min = 1;
$max = 200;

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

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❮ PHP Filter Reference