示例
检查途径是目录还是文件
该is_dir函数返回参数是否为目录，而is_file返回参数是否为文件。使用file_exists来检查它是否是要么。
$dir = "/this/is/a/directory";
$file = "/this/is/a/file.txt";
echo is_dir($dir) ? "$dir is a directory" : "$dir is not a directory", PHP_EOL,
is_file($dir) ? "$dir is a file" : "$dir is not a file", PHP_EOL,
file_exists($dir) ? "$dir exists" : "$dir doesn't exist", PHP_EOL,
is_dir($file) ? "$file is a directory" : "$file is not a directory", PHP_EOL,
is_file($file) ? "$file is a file" : "$file is not a file", PHP_EOL,
file_exists($file) ? "$file exists" : "$file doesn't exist", PHP_EOL;
这给出：
/this/is/a/directory is a directory
/this/is/a/directory is not a file
/this/is/a/directory exists
/this/is/a/file
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