FileSystem Function in PHP: Part 13

Introduction

In this article I describe the PHP FileSystem functions is_readable, is_uploaded, is_writable and is_writeable. To learn some other FileSystem functions, go to:

PHP is_readable() Function

The PHP FileSystem is_readable function checks whether a file exists and is readable and it returns true if the file or directory specified by the filename exists and is readable or false on failure.

Syntax

is_readable(file)

Parameter in is_readable function

The parameter of the function is:

Parameter	Description
file	It specifies the file to check.

Example

An example of the function is:

<?php
$file = "test.txt";
if(is_readable($file))
{
echo ("$file is <b>readable.</b>");
}
else
{
echo ("$file is not <b>readable.</b>");
}
?>
Output

PHP is_uploaded() Function

The PHP FileSystem is_readable function checks whether the file was uploaded via HTTP POST and it returns true on success and false on failure.

Syntax

is_uploaded(file)

Parameter in is_uploaded function

The parameter of the function is:

Parameter	Description
file	It specifies the file to check.

Example

An example of the function is:

<?php
$file = "test.txt";
if(is_uploaded_file($file))
{
echo ("$file is uploaded via HTTP POST.");
}
else
{
echo ("$file is not uploaded via HTTP POST.");
}
?>

Output

PHP is_writable() Function

The PHP FileSystem is_writable function checks whether the filename is writable and it returns true if the filename exists and is writable.

Syntax

is_writable(file)

Parameter in is_writable function

The parameter of the function is:

Parameter	Description
file	It specifies the file to check.

Example

An example of the function is:

<?php
$file = "test.txt";
if(is_writable($file))
{
echo ("$file is writable.");
}
else
{
echo ("$file is not writable.");
}
?>

Output

PHP is_writeable() Function

It is an alias of the is_writable function and it is also used to determine if the filename is writeable and it returns true if the filename exists and is writeable.

Syntax

is_writeable(file)

Parameter in is_writeable function

Parameter	Description
file	It specifies the file to check.

Example

An example of the function is:

<?php
$file = "test.txt";
if(is_writeable($file))
{
echo ("$file is writeable.");
}
else
{
echo ("$file is not writeable.");
}
?>

Output