Php generates a nested key array

$tpl = [
    "a",
    "b",
    "c",
    "d",
];
$value = "hello";
  • how to generate the following in code?
$arr["a"]["b"]["c"]["d"] = $value;
Mar.12,2022

$tpl = array_reverse($tpl);
$arr = $value;
foreach($tpl as $k) {
    $arr = [$k => $arr];
}
print_r($arr);
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-64f5-1b35b5c-2bfd1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35b5c-2bfd1.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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