is_numeric
(PHP 4, PHP 5, PHP 7)
is_numeric — Finds whether a variable is a number or a numeric string
Description
is_numeric ( mixed $var ) : bool
Determines if the given variable is a number or a numeric string.
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
$tests = array(
"42",
1337,
0x539,
02471,
0b10100111001,
1337e0,
"0x539",
"02471",
"0b10100111001",
"1337e0",
"not numeric",
array(),
9.1,
null
);
foreach ($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
See Also
- Numeric strings
- ctype_digit() - Check for numeric character(s)
- is_bool() - Finds out whether a variable is a boolean
- is_null() - Finds whether a variable is null
- is_float() - Finds whether the type of a variable is float
- is_int() - Find whether the type of a variable is integer
- is_string() - Find whether the type of a variable is string
- is_object() - Finds whether a variable is an object
- is_array() - Finds whether a variable is an array
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.is-numeric.php