fopen Unable to create new file correctly

$fp = fopen ("/www/modernsky/test_id_validater/1.jpg", "WB") or Die ("can ' t open file");
$fp = fopen ("1.jpg", "WB") or Die ("can ' t open file");
These statements always return "can ' t open file" and do not understand where the problem is

Reply to discussion (solution)

See if there is a directory limit.
chmod 777 Directory Name
$fp = fopen ("1.jpg", "WB") or Die ("can ' t open file");

See if there is a directory limit.
chmod 777 Directory Name
$fp = fopen ("1.jpg", "WB") or Die ("can ' t open file");

What does that mean? Directory restrictions? What is 777? The above sentence is written in PHP? Can php modify directory permissions? I feel dizzy.

See if there is a directory limit.
chmod 777 Directory Name
$fp = fopen ("1.jpg", "WB") or Die ("can ' t open file");

What does that mean? Directory restrictions? What is 777? The above sentence is written in PHP? Can php modify directory permissions? I feel dizzy.

This is the command in Linux, add read and write permission to your directory.

