Php umask
Contents |
PHP function umask
This function uses to removed file permission from the system default permission when create a file. The purpose of using umask function is to secure a file for other to access or modify.
Syntax umask
permission defines the permission. It's default value is 0777.
umask(permission)
Permission
- 1 = execute permission
- 2 = write permission
- 4 = read permission
The permission consists of four digits,
- first digit: always starts with a zero
- second digit : defines permission for owner
- third digit: defines permission for owner's group
- fourth digit: defines permission for everyone else
Permission example
- 0777 (rwxrwxrwx) is owner, owner's group, and everyone else can execute, write, and read
- 0775 (rwxrwxr-x) is owner can execute and write
- 0700 (rwx------) is for owner has permission to execute, read, and write
Note
Do not use umask function to set the file permission. Use chmod function.
Example 1
<?php
umask(0755);
$h1 = fopen("file1.txt",'w');
echo umask();
?>
Output
0755 (-----w--w-) for file1.txt
493
Example 2
<?php
$mrk = umask(0);
$h2 = fopen("file2.txt","w");
chmod("file2.txt",0770);
umask($mrk);
if($mrk != umask()) {
die ("error occured");
}
else {
echo "matched";
}
?>
Output
-rwxrwx--- 1 sophal sophal 0 2012-06-07 23:02 file2.txt
matched
Related Links
basename-- chgrp-- chmod-- chown-- clearstatcache-- copy-- delete-- dirname-- disk_free_space-- disk_total_space-- diskfreespace-- fclose-- feof-- fflush-- fgetc-- fgetcsv-- fgets-- fgetss-- file_exists-- file_get_contents-- file_put_contents- file-- fileatime-- filectime-- filegroup-- fileinode-- filemtime-- fileowner-- fileperms-- filesize-- filetype-- flock-- fnmatch-- fopen-- fpassthru-- fputcsv-- fputs-- fread-- fscanf-- fseek-- fstat-- ftell-- ftruncate-- fwrite-- glob-- is_dir-- is_executable-- is_file-- is_link-- is_readable-- is_uploaded_file-- is_writable-- is_writeable-- lchgrp-- lchown-- link-- linkinfo-- lstat-- mkdir-- move_uploaded_file-- parse_ini_file-- parse_ini_string-- pathinfo-- pclose-- popen-- readfile-- readlink-- realpath_cache_get-- realpath_cache_size-- realpath-- rename-- rewind-- rmdir-- set_file_buffer-- stat-- symlink-- tempnam-- tmpfile-- touch-- umask-- unlink--
