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wp_check_jsonp_callback › WordPress Function

Since4.6.0
Deprecatedn/a
› wp_check_jsonp_callback ( $callback )
Parameters:
  • (string) $callback Supplied JSONP callback function name.
    Required: Yes
Returns:
  • (bool) Whether the callback function name is valid.
Defined at:
Codex:

Checks that a JSONP callback is a valid JavaScript callback name.

Only allows alphanumeric characters and the dot character in callback function names. This helps to mitigate XSS attacks caused by directly outputting user input.


Related Functions: wp_rel_callback, wp_check_post_lock, wp_rel_nofollow_callback, wp_clean_theme_json_cache, _sort_name_callback

Source 

function wp_check_jsonp_callback( $callback ) {
	if ( ! is_string( $callback ) ) {
		return false;
	}

	preg_replace( '/[^\w\.]/', '', $callback, -1, $illegal_char_count );

	return 0 === $illegal_char_count;
}