Private Const
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Private Const
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Declares constants for use in place of literal values.
[ Public | Private ] Const constname [ As type ] = expression
The Const statement syntax has these parts:
Constants are private by default. Within procedures, constants are always private; their visibility can't be changed. In standard modules , the default visibility of module-level constants can be changed by using the Public keyword. In class modules , however, constants can only be private and their visibility can't be changed by using the Public keyword.
To combine several constant declarations on the same line, separate each constant assignment with a comma. When constant declarations are combined in this way, the Public or Private keyword, if used, applies to all of them.
You can't use variables, user-defined functions, or intrinsic Visual Basic functions (such as Chr ) in expressions assigned to constants.
Constants can make your programs self-documenting and easy to modify. Unlike variables, constants can't be inadvertently changed while your program is running.
If you don't explicitly declare the constant type by using As type , the constant has the data type that is most appropriate for expression .
Constants declared in a Sub , Function , or Property procedure are local to that procedure. A constant declared outside a procedure is defined throughout the module in which it is declared. You can use constants anywhere you can use an expression.
This example uses the Const statement to declare constants for use in place of literal values. Public constants are declared in the General section of a standard module, rather than a class module. Private constants are declared in the General section of any type of module.
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Optional. Keyword used at the module level to declare constants that are available to all procedures in all modules . Not allowed in procedures.
Optional. Keyword used at the module level to declare constants that are available only within the module where the declaration is made. Not allowed in procedures.
Required. Name of the constant; follows standard variable naming conventions.
Optional. Data type of the constant; may be Byte , Boolean , Integer , Long , Currency , Single , Double , Decimal (not currently supported), Date , String , or Variant . Use a separate As type clause for each constant being declared.
Required. Literal, other constant, or any combination that includes all arithmetic or logical operators except Is .
Are private constants possible in PHP? - Stack Overflow
Const statement (VBA) | Microsoft Docs | Private
Private Constants > PHP 7: The Important Stuff | SymfonyCasts
Constants in PHP 7
PHP 5.6 ะธ PHP 7 ะฝะฐ ััััะบะพะผ: ะะพะฝััะฐะฝัั ะบะปะฐััะพะฒ
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PHP 7: The Important Stuff
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src/AppBundle/Entity/GenusNote.php
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src/AppBundle/Controller/GenusController.php
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src/AppBundle/Entity/GenusNote.php
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src/AppBundle/Entity/GenusNote.php
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src/AppBundle/Controller/GenusController.php
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Okay enough with type hints and return types! PHP 7.1 added another cool feature
for class constants: we can finally make them private!
In GenusController find, getNotesAction() . This is used by an AJAX call to load
notes that appear at the bottom of the genus show page. For example, go to /genus
and click on one of them. Bam! At the bottom, an AJAX call loads a list of
notes, complete with an avatar. That comes from the avatarUri field that's returned.
Look at the /images/ part: that looks funny to me. All of our images are stored
in that directory, and that's fine. But I hate having random strings like this in
my code. This is a perfect place to use... drum roll... a constant!
Open GenusNote , which is the object we're rendering on this page. Add a new constant:
const AVATAR_FILE_PREFIX = '/images'; . Then, in the controller, use this:
GenusNote::AVATAR_FILE_PREFIX .
So far, this is all stuff we've seen before. And when we refresh... yep! Everything
still loads.
This is an improvement... but it would be even better if I could call a method
on GenusNote to get the complete avatarUri string, instead of calculating it
here in my controller. In other words, I don't want anyone to use our constant
anymore: we're going to add a public method instead.
In PHP 7.1, we can say private const .
Now, accessing that constant from outside
this class is illegal! That means, if we refresh, our AJAX calls are failing! On
the web debug toolbar, yep! You can see the 500 errors! If I open the profiler and
click "Exception", we see
Cannot access private const from the controller
Awesome! So now that I can't use the constant anymore, I'll be looking for a public
function to use instead. In GenusNote , add a public function getUserAvatarUri() .
Hey! We're PHP 7 pros now, so add a string return type.
Before we add the logic, let's make things fancier. Suppose that sometimes there
is not a userAvatarFilename value for a note. If that's true, let's show a default
avatar image.
Back at the top, add another private const BLANK_AVATAR_FILENAME = 'blank.jpg' .
We'll pretend that we have a blank.jpg file that should be used when there's no
avatar.
Back in the new method, add $filename = $this->getUserAvatarFilename(); . And,
if (!$filename) , then $filename = self::BLANK_AVATAR_FILENAME ... because we
can access the private constant from inside the class. Finish the method with
return self::AVATAR_FILE_PREFIX.'/'.$filename; .
Nice! Back in the controller, we're still accessing the private constant, which is
super obvious. That'll push me to use the public function getUserAvatarUri() .
const AVATAR_FILE_PREFIX = '/images' ;
class GenusController extends Controller
public function getNotesAction (Genus $genus)
foreach ($genus->getNotes() as $note) {
'avatarUri' => GenusNote::AVATAR_FILE_PREFIX. '/' .$note->getUserAvatarFilename(),
private const AVATAR_FILE_PREFIX = '/images' ;
public function getUserAvatarUri () : string
private const BLANK_AVATAR_FILENAME = 'blank.jpg' ;
public function getUserAvatarUri () : string
$filename = $this ->getUserAvatarFilename();
$filename = self ::BLANK_AVATAR_FILENAME;
return self ::AVATAR_FILE_PREFIX. '/' .$filename;
class GenusController extends Controller
public function getNotesAction (Genus $genus)
foreach ($genus->getNotes() as $note) {
'avatarUri' => $note->getUserAvatarUri(),
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