How does PHP delete all files in the specified directory (keep the directory)?

ask, how does PHP delete all files in the specified directory (keep the directory)?

Php
Mar.01,2021

<?php
$src = '';
$d = new RecursiveDirectoryIterator($src);
$i = new RecursiveIteratorIterator($d);
foreach ($i as $name => $file) {
    // unlink
    if (!is_dir($name)) {
        unlink($name);
    }
}
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e49084-437db.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e49084-437db.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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