<?php
$variavel='123';
$heredoc = <<<CODE
rand@#¨4key"'?></ <\\\\ $variavel \0
CODE;
$nowdoc = <<<'CODE'
rand@#¨4key"'?></ <\\\\ $variavel \0
CODE;
echo $heredoc . PHP_EOL;
echo $nowdoc . PHP_EOL;
PD9waHAKCiR2YXJpYXZlbD0nMTIzJzsKCiRoZXJlZG9jID0gPDw8Q09ERQpyYW5kQCPCqDRrZXkiJz8+PC8gPFxcXFwgJHZhcmlhdmVsIFwwCkNPREU7Cgokbm93ZG9jID0gPDw8J0NPREUnCnJhbmRAI8KoNGtleSInPz48LyA8XFxcXCAkdmFyaWF2ZWwgXDAKQ09ERTsKCgplY2hvICRoZXJlZG9jIC4gUEhQX0VPTDsKCmVjaG8gJG5vd2RvYyAuIFBIUF9FT0w7