php 获取上级目录名称

<?php
// 获取当前文件的上级目录
$current_file_path = __FILE__;
$parent_directory = dirname($current_file_path);
echo "当前文件的上级目录: " . $parent_directory . "\n";

// 获取指定路径的上级目录
$specified_path = "/var/www/html/project/data/file.txt";
$specified_parent_directory = dirname($specified_path);
echo "指定路径的上级目录: " . $specified_parent_directory . "\n";
?>

<?php
$path = "/var/www/html/";
$parent_directory = dirname($path);

if ($parent_directory === '') {
    echo "已经是根目录";
} else {
    echo "上级目录: " . $parent_directory;
}
?>

<?php
$path = "/var/www/html/project with spaces/data/file.txt";
$parent_directory = dirname(str_replace(' ', '\ ', $path));
echo "上级目录: " . $parent_directory;
?>