sanitize_key( string $key )

Sanitizes a string key.

Description

Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes, and underscores are allowed.

Parameters

$key: (Required) String key.

Return

(string) Sanitized key.

Source

File: wp-includes/formatting.php

function sanitize_key( $key ) {
	$raw_key = $key;
	$key = strtolower( $key );
	$key = preg_replace( '/[^a-z0-9_\-]/', '', $key );

	/**
	 * Filters a sanitized key string.
	 *
	 * @since WP-3.0.0
	 *
	 * @param string $key     Sanitized key.
	 * @param string $raw_key The key prior to sanitization.
	 */
	return apply_filters( 'sanitize_key', $key, $raw_key );
}

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Changelog

Changelog
Version	Description
3.0.0	Introduced.