Constant string syntaxes
-----
<?php

'';
"";
b'';
b"";
'Hi';
b'Hi';
B'Hi';
"Hi";
b"Hi";
B"Hi";
'!\'!\\!\a!';
"!\"!\\!\$!\n!\r!\t!\f!\v!\e!\a";
"!\xFF!\377!\400!\0!";
-----
array(
    0: Stmt_Expression(
        expr: Scalar_String(
            value:
        )
    )
    1: Stmt_Expression(
        expr: Scalar_String(
            value:
        )
    )
    2: Stmt_Expression(
        expr: Scalar_String(
            value:
        )
    )
    3: Stmt_Expression(
        expr: Scalar_String(
            value:
        )
    )
    4: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    5: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    6: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    7: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    8: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    9: Stmt_Expression(
        expr: Scalar_String(
            value: Hi
        )
    )
    10: Stmt_Expression(
        expr: Scalar_String(
            value: !'!\!\a!
        )
    )
    11: Stmt_Expression(
        expr: Scalar_String(
            value: !"!\!$!
        !@@{ "\r" }@@!@@{ "\t" }@@!@@{ "\f" }@@!@@{ "\v" }@@!@@{ chr(27) /* "\e" */ }@@!\a
        )
    )
    12: Stmt_Expression(
        expr: Scalar_String(
            value: !@@{ chr(255) }@@!@@{ chr(255) }@@!@@{ chr(0) }@@!@@{ chr(0) }@@!
        )
    )
)