PHP: Hypertext Preprocessor (original) (raw)

is_numeric

(PHP 4, PHP 5, PHP 7, PHP 8)

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

Description

Parameters

value

The variable being evaluated.

Changelog

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 ( testsastests as testsaselement) {
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 '' is NOT numeric

Example #2 is_numeric() with whitespace

`<?php
$tests = [
" 42",
"42 ",
"\u{A0}9001", // non-breaking space
"9001\u{A0}", // non-breaking space
];

foreach ( testsastests as testsaselement) {
if (is_numeric($element)) {
echo var_export($element, true) . " is numeric", PHP_EOL;
} else {
echo var_export($element, true) . " is NOT numeric", PHP_EOL;
}
}
?>`

Output of the above example in PHP 8:

' 42' is numeric '42 ' is numeric ' 9001' is NOT numeric '9001 ' is NOT numeric

Output of the above example in PHP 7:

' 42' is numeric '42 ' is NOT numeric ' 9001' is NOT numeric '9001 ' 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
• filter_var() - Filters a variable with a specified filter

Found A Problem?

sobolanx at gmail dot com ¶

14 years ago

`Note that the function accepts extremely big numbers and correctly evaluates them.

For example:

The above script will output:

bool(true)

So this function is not intimidated by super-big numbers. I hope this helps someone.

PS: Also note that if you write is_numeric (45thg), this will generate a parse error (since the parameter is not enclosed between apostrophes or double quotes). Keep this in mind when you use this function.

`

tanguy_barsik at hotmail dot com ¶

8 years ago

`for strings, it return true only if float number has a dot

is_numeric( '42.1' )//true
is_numeric( '42,1' )//false

`

moskalyuk at gmail dot com ¶

18 years ago

is_numeric fails on the hex values greater than LONG_MAX, so having a large hex value parsed through is_numeric would result in FALSE being returned even though the value is a valid hex number

ben at chico dot com ¶

11 years ago

`Apparently NAN (Not A Number) is a number for the sake of is_numeric().

Outputs "is a number". So something that is NOT a number (by defintion) is a number...

`

kouber at saparev dot com ¶

21 years ago

`Note that this function is not appropriate to check if "is_numeric" for very long strings. In fact, everything passed to this function is converted to long and then to a double. Anything greater than approximately 1.8e308 is too large for a double, so it becomes infinity, i.e. FALSE. What that means is that, for each string with more than 308 characters, is_numeric() will return FALSE, even if all chars are digits.

However, this behaviour is platform-specific.

http://www.php.net/manual/en/language.types.float.php

In such a case, it is suitable to use regular expressions:

function is_numeric_big($s=0) {
return preg_match('/^-?\d+$/', $s);
}

`

Magnus Deininger, dma05 at web dot de ¶

16 years ago

`regarding the global vs. american numeral notations, it should be noted that at least in japanese, numbers aren't grouped with an extra symbol every three digits, but rather every four digits (for example 1,0000 instead of 10.000). also nadim's regexen are slightly suboptimal at one point having an unescaped '.' operator, and the whole thing could easily be combined into a single regex (speed and all).

adjustments:

i'm sure this still isn't optimal, but it should also cover japanese-style numerals and it fixed a couple of other issues with the other regexen. it also allows for an exponent suffix, the pre-decimal digits are optional and it enforces using either grouped or ungrouped integer parts. should be easier to trim to your liking too.

`

Katrina Kizenbach ¶

2 years ago

`Note that is_numeric() will evaluate to false for number strings using decimal commas.

is_numeric('0.11');
Output: true

is_numeric('0,11');
Output: false

`