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: Scalar_String(
        value:
    )
    1: Scalar_String(
        value:
    )
    2: Scalar_String(
        value:
    )
    3: Scalar_String(
        value:
    )
    4: Scalar_String(
        value: Hi
    )
    5: Scalar_String(
        value: Hi
    )
    6: Scalar_String(
        value: Hi
    )
    7: Scalar_String(
        value: Hi
    )
    8: Scalar_String(
        value: Hi
    )
    9: Scalar_String(
        value: Hi
    )
    10: Scalar_String(
        value: !'!\!\a!
    )
    11: Scalar_String(
        value: !"!\!$!
    !@@{ "\r" }@@!@@{ "\t" }@@!@@{ "\f" }@@!@@{ "\v" }@@!@@{ chr(27) /* "\e" */ }@@!\a
    )
    12: Scalar_String(
        value: !@@{ chr(255) }@@!@@{ chr(255) }@@!@@{ chr(0) }@@!@@{ chr(0) }@@!
    )
)