What are the potential limitations of using the "df -h" command in PHP to check web space usage?

Using the "df -h" command in PHP to check web space usage may not be reliable as it relies on system commands that may not be available on all servers. A better approach would be to use PHP functions like disk_total_space() and disk_free_space() to accurately determine disk space usage. 

$total_space = disk_total_space('/');
$free_space = disk_free_space('/');
$used_space = $total_space - $free_space;

echo "Total space: " . $total_space . " bytes\n";
echo "Free space: " . $free_space . " bytes\n";
echo "Used space: " . $used_space . " bytes\n";

Keywords

df -h PHP web space limitations command

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