Codeigniter Functions :-

file_exists($path)

$file_path = '/upload/mywork/sana.txt';
if (file_exists($file_path)) {
echo "file exist";
}else {
echo "Not exist";
}

<?php
$file = "upload";
if(is_dir($file)) {
echo "$file is a directory);
} else {
echo "$file is not a directory";
}
?>

if (!file_exists('upload/images')) {
mkdir('upload/images', 0777, true);
}

####################################################

$upload_path_dir = '/media/files/images/';
if (!is_dir($upload_path_dir))
{
$oldmask = umask(0);
mkdir($upload_path_dir,0777,TRUE);
umask($oldmask);
}

Specifies the new permissions. Default is 0777
The mask parameter consists of four numbers:

The first number is always zero
The second number specifies permissions for the owner
The third number specifies permissions for the owner's user group
The fourth number specifies permissions for everybody else
Possible values (to set multiple permissions, add up the following numbers):

1 = execute permissions
2 = write permissions
4 = read permissions

<?php
$filename = '/path/to/foo.txt';

if (file_exists($filename)) {
echo "The file $filename exists";
} else {
echo "The file $filename does not exist";
}
?>
The result of file_exists() is cached, which means you first need to call the clearstatcache() function if you want to be absolutely sure a file exists.

We can use file_exists() to check whether a file exists or not, but keep in mind that this does not work properly with HTTP URLs. This function expects Path to the file or directory parameter. It will Returns TRUE if the file or directory specified by filename exists; FALSE otherwise.