Description:
------------
When injecting 0 byte in first parameter of file_get_contents this will produce a warning and should return FALSE according PHP documentation. But the return is NULL.

Test script:
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$fc1 = file_get_contents("not-existing-file.txt");
$fc2 = file_get_contents("not-existing-file.txt\0");
echo PHP_EOL;
var_dump($fc1);
var_dump($fc2);

Expected result:
----------------
PHP Warning:  file_get_contents(not-existing-file.txt): failed to open stream: No such file or directory in /home/arch/php-fgc-test.php on line 2
PHP Warning:  file_get_contents() expects parameter 1 to be a valid path, string given in /home/arch/php-fgc-test.php on line 3

bool(false)
bool(false)


Actual result:
--------------
PHP Warning:  file_get_contents(not-existing-file.txt): failed to open stream: No such file or directory in /home/arch/php-fgc-test.php on line 2
PHP Warning:  file_get_contents() expects parameter 1 to be a valid path, string given in /home/arch/php-fgc-test.php on line 3

bool(false)
NULL