In this article, you will learn how to check if a number is numeric or not in PHP. The PHP 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.

what is the syntax of the IS_NUMERIC() function in php?

is_numeric(variable);

examples of the IS_NUMERIC() function

Example 1. In this example, we check whether a variable is a number or a numeric string, or not.

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

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

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

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

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

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

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