Backtick operator does not parse interpolated variables #135
Description
The backtick execution operator can have variables that are interpolated, but these are not parsed.
<?php
`hello $world`;
Actual:
(program [0, 0] - [2, 0]
(php_tag [0, 0] - [0, 5])
(expression_statement [1, 0] - [1, 15]
(shell_command_expression [1, 0] - [1, 14])))
Expected:
(program [0, 0] - [2, 0]
(php_tag [0, 0] - [0, 5])
(expression_statement [1, 0] - [1, 15]
(shell_command_expression [1, 0] - [1, 14])))
(string [1, 1] - [1, 7])
(variable_name [1, 7] - [1, 13]
(name [1, 8] - [1, 13])))))