Why does the lastInsertId of pdo always return 1?

function execute($pdo, $sql="select version();", $params=[])
{
    $stmt = $pdo->prepare($sql);
    $ret = $stmt->execute($params);
    $lastId = $pdo->lastInsertId();
    if ($ret && $lastId) {
        return $lastId;
    } else {
        return false;
    }
}

lastId1id
Php
Mar.01,2021
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-64f5-1be8425-31903.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1be8425-31903.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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