(PHP 4, PHP 5, PHP 7)
fclose — Closes an open file pointer
fclose ( resource $handle ) : bool
The file pointed to by handle is closed.
handle
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen().
Returns true on success or false on failure.
Example #1 A simple fclose() example
<?php
$handle = fopen('somefile.txt', 'r');
fclose($handle);
?>
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https://www.php.net/manual/en/function.fclose.php