File And Directory Manipulation In PHP (part 1) - Permission Granted (Page 7 of 9 )
In addition to obtaining basic information on a file, PHP also comes with a set of functions designed to provide information on file sizes, permissions and modification times. Here's a list:
filesize() - gets size of file
filemtime() - gets last modification time of file
filemtime() - gets last access time of file
fileowner() - gets file owner
filegroup() - gets file group
fileperms() - gets file permissions
filetype() - gets file type
Consider the following example, which asks for a file name and displays the above information for that file:
<html>
<head>
</head>
<body>
<?php
// if form has not yet been submitted
// display input box
if (!$_POST['file'])
{
?>
<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
Enter file path <input type="text" name="file">
</form>
<?
}
// else process form input
else
{
echo "Filename: <b>" . $_POST['file'] . "</b><br>";
// check if file exists
if (file_exists($_POST['file']))
{
// print file size
echo "File size: <b>" . filesize($_POST['file']) . " bytes</b><br>";
// print file owner
echo "File owner: <b>" . fileowner($_POST['file']) . "</b><br>";
// print file group
echo "File group: <b>" . filegroup($_POST['file']) . "</b><br>";
// print file permissions
echo "File permissions: <b>" . fileperms($_POST['file']) . "</b><br>";
// print file type
echo "File type: <b>" . filetype($_POST['file']) . "</b><br>";
// print file last access time
echo "File last accessed on: <b>" . date("Y-m-d",
fileatime($_POST['file'])) . "</b><br>";
// print file last modification time
echo "File last modified on: <b>" . date("Y-m-d",
filemtime($_POST['file'])) . "</b><br>";
}
else
{
echo "File does not exist! <br>";
}
}
?>
</body>
</html>
Here's the output:
Filename: /apps/inventory_control/reports.php
File size: 1503 bytes
File owner: 512
File group: 100
File permissions: 33188
File type: file
File last accessed on: 2003-07-31
File last modified on: 2003-07-25
Note that the various file functions discussed in this section only return valid values if the underlying operating system supports them. On Windows, for example, it's quite likely that the fileowner(), filegroup() and
fileperms() functions will return null values.
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