PHP | is_writable() Function
Last Updated :
05 Jun, 2018
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The is_writable() function in PHP used to check whether the specified file is writable or not. The name of the file is sent as a parameter to the is_writable() function and it returns True if the filename exists and is writable.
Name of a directory can also be a parameter to the is_writable() function which allows checking whether the directory is writable or not.
Syntax:
php
Output:
php
Output:
is_writable(file)Parameters Used: The is_writable() function in PHP accepts one parameter.
- file : It is a mandatory parameter which specifies the file.
- An E_WARNING is emitted on failure.
- The result of this function are cached and therefore the clearstatcache() function is used to clear the cache.
- is_writable() function returns false for non-existent files.
Input : $myfile = "gfg.txt";
if(is_writable($myfile))
{
echo ("$myfile file is writable!");
}
else
{
echo ("$myfile file is not writable!");
}
Output : gfg.txt file is writable!
Input : $permissions = fileperms("gfg.txt");
$perm_value = sprintf("%o", $permissions);
$myfile = "gfg.txt";
if (is_writable($myfile))
{
echo ("$myfile file is writable and
it has the following file permissions : $perm_value");
}
else
{
echo ("$myfile file is not writable and
it has the following file permissions : $perm_value");
}
Output : gfg.txt file is writable and it has the following file permissions : 0664
Below programs illustrate the is_writable() function.
Program 1
<?php
$myfile = "gfg.txt";
// checking whether the file is writable or not
if(is_writable($myfile))
{
echo ("$myfile file is writable!");
}
else
{
echo ("$myfile file is not writable!");
}
?>
gfg.txt file is writable!Program 2
<?php
// checking permissions of the file
$permissions = fileperms("gfg.txt");
$perm_value = sprintf("%o", $permissions);
// Clearing the File Status Cache
clearstatcache();
$myfile = "gfg.txt";
// checking whether the file is writable or not
if(is_writable($myfile))
{
echo ("$myfile file is writable and
it has the following file permissions : $perm_value");
}
else
{
echo ("$myfile file is not writable and
it has the following file permissions : $perm_value");
}
// Clearing the File Status Cache
clearstatcache();
?>
gfg.txt file is writable and it has the following file permissions : 0664Reference: http://php.net/manual/en/function.is-writable.php
