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In PHP the single quotation mark (`'x'`) is reading the content as raw values. This means, that escape sequences, such as `\n`, or variable interpolation, such as `$x`, is not supported.

There are three possible ways to resolve that issue:

1. **String concatenation.** You can concatenate strings with the `.` operator:

    ```php
    $name = 'JohnDoea';
    'hello ' . $name == 'hello JohnDoea'
    ```

2. **Double-quote string.** Instead of using a single-quotation mark, you can use double-quoted strings (`"x"`). They support escape sequences and variable interpolation:


    ```php
    $name = 'JohnDoea';
    "hello $name" == 'hello JohnDoea'
    ```

    In this syntax, you need to keep in mind, though, to escape the double quotes in the HTML with a backslash (`\"`).

3. **Heredoc syntax.** PHP also has a string format called [*Heredoc*](
https://www.php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc). This allows you to easily include long strings with escape sequences and variable interpolation:

    ```php
    $name = 'JohnDoea';
    $string = <<<LABEL
    hello $name
    LABEL;
    $string == 'hello JohnDoea'
    ```