How does PHP copy and move the specified file to another directory?

ask, how does PHP move"a directory / b directory / specified file .txt"to"c directory / d directory / specified file .txt"?

Php
Mar.01,2021

<?php
$src = 'a/b/.txt';
$dst = 'c/d/.txt';
// mkdir()c/d
mkdir(dirname($dst), 0777, true);
// 
rename($src, $dst);
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-64f5-1b393f9-4d818.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b393f9-4d818.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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