Hash #¶
# is character, used in various situations:
one line comment:
# comments after the characterSeparator in a URL, for the anchor:
https://www.php.net/ChangeLog-8.php#8.5.3
A hash may also be a type of arrays.
<?php
file_get_contents('https://www.php.net/ChangeLog-8.php#8.5.3');
echo 1; # A single line comment
?>
