Title: InputValidator::is_numeric_array_key
Published: March 29, 2023
Last modified: November 8, 2023

---

# InputValidator::is_numeric_array_key( mixed $input ): bool

## In this article

 * [Parameters](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#parameters)
 * [Return](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#return)
 * [Source](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#source)

[ Back to top](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#wp--skip-link--target)

Verify whether a received input parameter is usable as an integer array key.

## 󠀁[Parameters](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#parameters)󠁿

 `$input`mixedrequired

Input parameter to verify.

## 󠀁[Return](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#return)󠁿

 bool

## 󠀁[Source](https://developer.wordpress.org/reference/classes/wporg-requests-utility-inputvalidator/is_numeric_array_key/?output_format=md#source)󠁿

    ```php
    public static function is_numeric_array_key($input) {
    	if (is_int($input)) {
    		return true;
    	}

    	if (!is_string($input)) {
    		return false;
    	}

    	return (bool) preg_match('`^-?[0-9]+$`', $input);
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/requests/src/utility/inputvalidator.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/Requests/src/Utility/InputValidator.php#L39)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/Requests/src/Utility/InputValidator.php#L39-L49)

## User Contributed Notes

You must [log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fdeveloper.wordpress.org%2Freference%2Fclasses%2Fwporg-requests-utility-inputvalidator%2Fis_numeric_array_key%2F)
before being able to contribute a note or feedback.