Retrieving File Information
It is rather unusual to use PHP for accessing directory and file informationat least as long as the vast majority of PHP scripts run via HTTP in a web server and not using the command line interface (CLI) or PHP.
However, PHP offers a variety of helper functions that provide information about a file. Most of them are just calling the relevant operating system functions.
Reading Information About Files (fileinfos.php)
<?php
$filename = __FILE__;
$data = array(
'fileatime' => fileatime($filename),
'filegroup' => filegroup($filename),
'filemtime' => filemtime($filename),
'fileowner' => fileowner($filename),
'filesize' => filesize($filename),
'is_dir' => var_export(is_dir($filename), true),
'is_executable' =>
var_export(is_executable($filename), true),
'is_file' => var_export(is_file($filename),
true),
'is_link' => var_export(is_link($filename),
true),
'is_readable' => var_export(is_readable
($filename), true),
'is_uploaded_file' => var_export
(is_uploaded_file($filename), true),
'is_writable' => var_export
(is_writable($filename), true)
);
echo '<table>';
foreach ($data as $function => $result) {
echo
"<tr><td>$function</td><td>$result</td></tr>";
}
echo '</table>';
?>
The following list shows the most relevant helper functions in this regard:
fileatime($filename)
Last access to the file
filegroup($filename)
Group that owns the file
filemtime($filename)
Last change to the file
fileowner($filename)
File owner
filesize($filename)
Size of the file
Another set of helper functions also takes a filename, so the files do not have to be opened before you use these functions:
is_dir($path)
Whether the path is a directory
is_executable($filename)
Whether the filename is an executable
is_file($path)
Whether the path is a (regular) file
is_link($filename)
Whether the filename is a symbolic link
is_readable($filename)
Whether the file is readable
is_uploaded_file($path)
Whether the path is a file uploaded via HTTP (see Chapter 5, "Remembering Users (Cookies and Sessions)")
is_writable($filename)
Whether the file is writable
Figure 6.5 contains the result of the code at the beginning of this phrase.
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