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Coding Guideline

These standards for code formatting and documentation must be followed by anyone contributing to the |omv| project. Any contributions that do not fullfill these guidelines will not be accepted.

File Formatting

Use 4 space tabs for writing your code. If you are modifying someone else's code, try to keep the coding style similar.
Line Length
Lines shouldn't be longer than 80 characters.
Line Endings
Line endings should be Unix-style LF.
Files should be saved with UTF-8 encoding.

Naming Conventions


PHP classes should use the OMV namespace.

namespace OMV\System;

 * @ingroup api
class Process {
        use \OMV\DebugTrait;

Functions/Methods must use camel case syntax, this convention capitalizes the first character of each word except the first one.

public function getGecos() {

public function getHomeDirectory() {

Variables must use camel case syntax, this convention capitalizes the first character of each word except the first one.


Constants should start with OMV_ and should be all upper case.

$OMV_DEFAULT_FILE = "/etc/default/openmediavault";
$OMV_JSONSCHEMA_SORTFIELD = '"type":["string","null"]';

Multiline parameters

Functions with many parameters may need to be split onto several lines to keep the 80 characters/line limit. The first parameters may be put onto the same line as the function name if there is enough space. Subsequent parameters on following lines are to be indented using 1 tab.

throw new OMVException(OMVErrorMsg::E_EXEC_FAILED,
    $cmd, implode("\n", $output));

$dispatcher->notify(($data['uuid'] == $GLOBALS['OMV_UUID_UNDEFINED']) ?
    "", $object);

Control Structures

for (i = 0; i < 10; i++) {
    if (foo(i)) {

switch (x) {
case 'a':
case "b":

if (a) {
} else {

if (TRUE === $result)

foreach ($output as $outputk => $outputv) {


Single line comments
You should use the // comment style to "comment out" code. It may be used for commenting sections of code too. Single line comments must be indented to the indent level when they are used for code documentation.
Block comments

Block comments should usually be avoided. For descriptions use the // comments.

// Parse output:
// shadow:x:42:openmediavault
// snmp:x:112:
// sambashare:x:113:
// openmediavault:x:999:
// nut:x:114:
foreach ($output as $outputv) {
Documentation comments

Use the doxygen syntax where possible.

 * Get the filesystem label.
 * @return string The filesystem label, otherwise FALSE.
public function getLabel() {

 * Enumerate all disk devices on the system.
 * @return array An array containing physical disk device objects with
 *   the fields \em devicename, \em devicefile, \em model, \em size,
 *   \em description, \em vendor, \em serialnumber, \em israid and
 *   \em isrootdevice.
public function enumerateDevices() {

 * Enumerate all disk devices on the system. The field \em hdparm will
 * be added to the hard disk objects if there exists additional hard
 * disk parameters (e.g. S.M.A.R.T. or AAM) that can be defined
 * individually per hard disk.
 * @param array data An array containing the following fields:
 *   \em start The index where to start.
 *   \em limit The number of objects to process.
 *   \em sortfield The name of the column used to sort.
 *   \em sortdir The sort direction, ASC or DESC.
 * @return array An array containing the requested objects. The field
 *   \em total contains the total number of objects, \em data contains
 *   the object array. An exception will be thrown in case of an error.
public function getList($data) {