我使用php脚本备份我的数据库。以下是给定的脚本：
$datestamp = date("Y-m-d_h-i-s"); // Current date to append to filename of backup file in format of YYYY-MM-DD
/* CONFIGURE THE FOLLOWING FOUR VARIABLES TO MATCH YOUR SETUP */
$dbuser = "xyz"; // Database username
$dbpwd = "*****"; // Database password
$dbname = "mydatabase"; // Database name. Use --all-databases if you have more than one
$filename = "backup-$datestamp.sql.gz"; // The name (and optionally path) of the dump file
$command = "mysqldump -u $dbuser --password=$dbpwd $dbname | gzip > $filename";
$result = system($command);
以下是命令行
php5 /var/www/vhosts/cc.astra1641.startdedicated.de/httpdocs/cron/backup.php
我使用var_dump输出$ result变量来检查它是否返回空字符串。我也试过使用其他方法，如exec（$ command）或passthru（$ command），它不起作用。