is_null
is_object
Variable handling Functions
PHP Manual

# is_numeric

(PHP 4, PHP 5)

is_numeric — Finds whether a variable is a number or a numeric string

### Description

bool is_numeric ( mixed `$var` )

Finds whether the given variable is numeric. Numeric strings consist of optional sign, any number of digits, optional decimal part and optional exponential part. Thus +0123.45e6 is a valid numeric value. Hexadecimal notation (0xFF) is allowed too but only without sign, decimal and exponential part.

### Parameters

`var`

  The variable being evaluated.

### Return Values

Returns `TRUE` if `var` is a number or a numeric string, `FALSE` otherwise.

### Examples

Example #1 is_numeric() examples

`<?php
$tests = Array(
"42",
1337,
"1e4",
"not numeric",
Array(),
9.1
);
foreach($tests as $element)
{
if(is_numeric($element))
{
echo "'{$element}' is numeric", PHP_EOL;
}
else
{
echo "'{$element}' is NOT numeric", PHP_EOL;
}
}
?>`

### See Also

- ctype_digit()
- is_bool()
- is_null()
- is_float()
- is_int()
- is_string()
- is_object()
- is_array()

is_null
is_object
Variable handling Functions
PHP Manual