I have a query string that contains a variable like this

```
$field_name = 'features';
$value = '5';
$query = "SELECT * FROM Table WHERE $field_name\_tid = '$value'";

```

My goal is to print out the `$query` like this `SELECT * FROM Table WHERE features_tid = '5';`
I put `\_` there hoping it would work as escape character, but it didn't work. Is there any way to achieve this without use methods like `". $field_name ."` and modifying original variable value?