protected function get_interpolated_variables( $string ) {
		$variables = array();
		if ( preg_match_all( '/(?P<backslashes>\\\\*)\$(?P<symbol>\w+)/', $string, $match_sets, \PREG_SET_ORDER ) ) {
			foreach ( $match_sets as $matches ) {
				if ( ! isset( $matches['backslashes'] ) || ( \strlen( $matches['backslashes'] ) % 2 ) === 0 ) {
					$variables[] = $matches['symbol'];
				}
			}
		}
		return $variables;
	}
protected function get_interpolated_variables( $string ) {
		$variables = array();
		if ( preg_match_all( '/(?P<backslashes>\\\\*)\$(?P<symbol>\w+)/', $string, $match_sets, \PREG_SET_ORDER ) ) {
			foreach ( $match_sets as $matches ) {
				if ( ! isset( $matches['backslashes'] ) || ( \strlen( $matches['backslashes'] ) % 2 ) === 0 ) {
					$variables[] = $matches['symbol'];
				}
			}
		}
		return $variables;
	}
protected function get_interpolated_variables ( $ string ) { $ variables = array ( ) ; if ( preg_match_all ( '/(?P<backslashes>\\\\*)\$(?P<symbol>\w+)/' , $ string , $ match_sets , \ PREG_SET_ORDER ) ) { foreach ( $ match_sets as $ matches ) { if ( ! isset ( $ matches [ 'backslashes' ] ) || ( \ strlen ( $ matches [ 'backslashes' ] ) % 2 ) === 0 ) { $ variables [ ] = $ matches [ 'symbol' ] ; } } } return $ variables ; }
Get the interpolated variable names from a string.

Check if '$' is followed by a valid variable name, and that it is not preceded by an escape sequence.

@since 0.9.0

@param string $string The contents of a T_DOUBLE_QUOTED_STRING or T_HEREDOC token.

@return array Variable names (without '$' sigil).
Get the interpolated variable names from a string .