Description:
------------
Signature of file_get_contents is ($filename, $use_include_path = false, $context = null, $offset = 0, $maxlen = null) so null is an allowed value for maxlen.

Yet, when I explicitly gave the default values in my call: file_get_contents($filename, false, null, 0, null), no content is found.

If I call the function with only the filename (so default values will be used too), content is found.

If I explicitly gave default values for all parameters except maxlen, content is found.

Test script:
---------------
echo 'default: ' . strlen(file_get_contents($filename)) . PHP_EOL;
echo 'without maxlen: ' . strlen(file_get_contents($filename, false, null, 0)) . PHP_EOL;
echo 'with maxlen: ' . strlen(file_get_contents($filename, false, null, 0, null)) . PHP_EOL;