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php中可以显示文件的各种属性，这些属性包括文件的最后访问时间、最后修改时间、文件大小等。
<HTML>
<HEAD>
<TITLE>Returning information about a file</TITLE>
</HEAD>
<BODY>
<?
print "The size of the file is ";
print filesize( "samplefile.doc" );
print "<br>";
$atime = fileatime( "samplefile.doc" );
print "This file accessed on ";
print date("l, M d, Y g:i a", $atime);
print "<br>";
$mtime = filemtime( "samplefile.doc" );
print "This file was modified on ";
print date("l, M d, Y g:i a", $mtime);
print "<br>";
$ctime = filectime( "samplefile.doc" );
print "This file was changed on ";
print date("l, M d, Y g:i a", $ctime);
?>
</BODY>
</HTML>