PHP is_numeric() Function

Example

Check whether a variable is a number or a numeric string, or not:

<?php
$a = 32;
echo "a is " . is_numeric($a) . " ";

$b = 0;
echo "b is " . is_numeric($b) . " ";

$c = 32.5;
echo "c is " . is_numeric($c) . " ";

$d = "32";
echo "d is " . is_numeric($d) . " ";

$e = true;
echo "e is " . is_numeric($e) . " ";

$f = null;
echo "f is " . is_numeric($f) . " ";
?>

Try it Yourself »

Definition and Usage

The is_numeric() function checks whether a variable is a number or a numeric string.

This function returns true (1) if the variable is a number or a numeric string, otherwise it returns false/nothing.

Syntax

is_numeric( variable);

Parameter Values

Parameter	Description
variable	Required. Specifies the variable to check

Technical Details

Return Value:	TRUE if variable is a number or a numeric string, FALSE otherwise
Return Type:	Boolean
PHP Version:	4.0+

❮ PHP Variable Handling Reference