PHP file Property related functions

<meta charset= "Utf-8" >
<?php
function to get file attributes
function Getfilepro ($filename) {
Detects if a file exists
if (file_exists ($filename)) {
echo "This file exists <br>";

Detect if it is a directory
if (Is_dir ($filename)) {
echo "This is a catalogue <br>";
}

Detect if it is a file
if (Is_file ($filename)) {
echo "This is a file <br>";
FileSize () only returns the number of bytes
echo "File Size:". Tosize (FileSize ($filename)). " <br> ";
}

Get file permissions
Detect whether it is readable
if (is_readable ($filename)) {
echo "Document readable <br>";
}

if (is_writable ($filename)) {
echo "File writable <br>";
}

if (is_executable ($filename)) {
echo "File executable <br>";
}

Creation time
echo Date ("Y-m-d h:i:s", Filectime ($filename)). " <br> ";
Access time
echo Date ("Y-m-d h:i:s", Fileatime ($filename)). " <br> ";
Modification time
echo Date ("Y-m-d h:i:s", Filemtime ($filename)). " <br> ";

} else {
echo "This file does not exist <br>";
}
}
Getfilepro ("Fengge.txt");

File size conversion function
function Tosize ($size) {
$s = $size;
$DW = "";
2 of the 40 parties, 1024 of the 2-time Square
if ($size > Pow (2, 40)) {
$s = $size/pow (2, 40);
$DW = "TB";
} elseif ($size > Pow (2, 30)) {
$s = $size/pow (2, 30);
$DW = "GB";
} elseif ($size > Pow (2, 20)) {
$s = $size/pow (2, 20);
$DW = "MB";
} elseif ($size > Pow (2, 10)) {
$s = $size/pow (2, 10);
$DW = "KB";
}else {
$s = $size;
$DW = "Types";
}

return $s. $dw;
}

Get the type of file
function Getfiletype ($filename) {
Fifo,char,dir,block,link,file
Switch (filetype ($filename)) {
Case ' dir ':
echo "This is a catalogue <br>";
Break
Case ' char ':
echo "This is a character device <br>";
Break
Case ' block ':
echo "This is a block device <br>";
Break
Case ' file ':
echo "This is a file <br>";
Break
Case ' link ':
echo "This is a link <br>";
Break
Default
echo "Last known type <br>";
}
}
Get the type of file
Getfiletype ($filename);

PHP file Property related functions