(PHP 4, PHP 5, PHP 7)
is_numeric — Finds whether a variable is a number or a numeric string
is_numeric ( mixed $var ) : bool
Determines if the given variable is a number or a numeric string.
var
The variable being evaluated.
Returns true
if var
is a number or a numeric string, false
otherwise.
Example #1 is_numeric() examples
<?php $tests = array( "42", 1337, 0x539, 02471, 0b10100111001, 1337e0, "0x539", "02471", "0b10100111001", "1337e0", "not numeric", array(), 9.1, null ); foreach ($tests as $element) { if (is_numeric($element)) { echo var_export($element, true) . " is numeric", PHP_EOL; } else { echo var_export($element, true) . " is NOT numeric", PHP_EOL; } } ?>
The above example will output:
'42' is numeric 1337 is numeric 1337 is numeric 1337 is numeric 1337 is numeric 1337.0 is numeric '0x539' is NOT numeric '02471' is numeric '0b10100111001' is NOT numeric '1337e0' is numeric 'not numeric' is NOT numeric array ( ) is NOT numeric 9.1 is numeric NULL is NOT numeric
© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.is-numeric.php