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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.


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;
}