The is_numeric Function
The is_numeric function checks whether the passed value is a number or a string
that can be interpreted as a number. The function returns true if the value
is a number or a numeric string, and false otherwise.
Syntax
is_numeric(mixed $value): bool
Example
Let's check several values for compliance with the numeric format:
<?php
var_dump(is_numeric(123)); // true
var_dump(is_numeric('123')); // true
var_dump(is_numeric('12.3')); // true
var_dump(is_numeric('abc')); // false
var_dump(is_numeric('123a')); // false
?>
Example
Let's check the operation with various numeric formats:
<?php
var_dump(is_numeric(0x1A)); // true (hexadecimal)
var_dump(is_numeric('0x1A')); // false (string with hexadecimal number)
var_dump(is_numeric(1.2e3)); // true (exponential notation)
var_dump(is_numeric('1.2e3')); // true (string with exponential notation)
?>
