get_post_custom_keys( int $post_id )

Retrieves meta field names for a post.

Description

If there are no meta fields, then nothing (null) will be returned.

Parameters

$post_id

(Optional) Post ID. Default is the ID of the global $post.

Return

(array|void) Array of the keys, if retrieved.

Source

File: wp-includes/post.php 

function get_post_custom_keys( $post_id = 0 ) {
	$custom = get_post_custom( $post_id );

	if ( !is_array($custom) )
		return;

	if ( $keys = array_keys($custom) )
		return $keys;
}

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Changelog

Changelog
Version Description
1.2.0 Introduced.