Implicit Class Variable Declaration?

Jun 25, 2010

I've been looking at some code and am having a hard time working out variable declaration in php classes. Specifically it appears that the code i'm looking at doesn't declare the class variables before it uses them. Now this may be expected but I can't find any info that states that it is possible. So would you expect this:

class Example
public function __construct()


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Why Implicit Property Declaration In Script

I'm wondering why the PHP language allows implicit property declaration when most languages need to define properties within the class declaration itself (see code below). Is there a practical use for this type of coding style?

$user1 = new User();
$user1->name = "Kylie";
echo $user1->name;
class User{}

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Closures And Implicit Global Variable Scope?

Is there a way that one can implicitly declare top-level variables as global for use in closures? For example, if working with code such as this:


So in summary/TL;DR, is there a way to implicitly declare variables as global for use in closures (or other functions I suppose) without making use of the global keyword or $GLOBALS super-global?

I started this topic at another forum I frequent [URL]...

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Bug With Array Declaration In Class

Can someone confirm this problem:

This works:

var $x = array(
"x" => "x".
"y" => "a".


But this doesn't work:

class g{
var $x = array(
"x" => "x".
"y" => "a".

$g = new g();


It throws

Parse error: parse error, expecting `')'' in x.php on line 5

I know I have an outdated version of PHP (4.3.2), but it is compiled
with a special MSSQl extension and I cannot seem to compile the patch
with 4.3.3 and 4.3.4. The patch reads the milliseconds for dates.
There's a workaround, but it would involve heaps of testing again.

Just wanted to see, if its worth going to a different version.

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Dynamic Declaration Of Class Variables?

I have a mysql table, but because there are lots of fields, I want to create automatically variables in the class, taking their names from fields' names.

I know how to do it outside a class, but in a class you have to declare the variables before use them. So I can't figure out how to dynamic declare variables through code inside the class. Any idea? Or is it possible?

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Call First Declaration Of Foo From Extended Class


I'm sure there are a few of you scratching your head trying to figure out why I would ever want to do something like this, so I promise you this will make sense, just let me explain. I have a function that works just fine by it's self and I have some other classes that extend upon the base class to add some functions to it, these classes do the same task but in a different context or with additional information so they must do all of the steps of the parent class but they must also do some special sub set's in some cases. Is there a way I can still execute a's foo method and my sub classes foo method? I know I could fix this with some awful hacks like making the method a file, and then including that file in both the parent function and it's siblings where needed, or I could make a second method called bar() that would contain the instructions of foo() and have my sub classes overwrite foo() but call bar() when they need the functionality of foo(). I'm just wondering if I can do this without using some pretty interesting hacks, is there something I don't know about PHP that someone on here can teach me?

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Error In Object Declaration When PDO Class Is Extended

I have create three classes. One class is db which extends from PDO. Other two class extends from the db class. But the problem is when I initialize objects of these sub classes the second object is created as clone of the first object.


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Oop - Not Declaring Variables At The Start Of The Class Declaration?

Are there any consequences to not declaring variables at the start of the class declaration. I mean, I always do it because it is just neater and nicer, but my latest project is huge, and I have added loads of vars without declaration in the heat of the moment without consequence. I am now about to go and add them all to the opening declaration no matter what, just curious.

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Oop - Anonymous Function Declaration In An Existing Class Object?

Possible Duplicate:

Initialize class property with an anonymous function

I've been programing PHP for quite a while, and PHP 5.3 anonymous functions are one of those thinks that help you out a lot while building some simple scripts. However, I cannot understand why would the following example won't work?

$db = new PDO([..]);
$db->die = function($str){ die(var_dump( $str )); };

After all, all I do is declare anonymous function on ->die property of PDO instance.

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Question About Variable Declaration

I have modified my PHP.ini file so that it reports E_ALL, even the
notices. I wanted to see everything. Question is how do I declare a
variable... bare with me, Im new to PHP.

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Force Variable Declaration

If you code in C or VB or PERL or other language, you are required (at least you can choose to) to DECLARE the any variable before you can use it. This will help the compiler to detect more possible mistakes and I found it useful.

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Echo Variable Before Declaration?

I need to echo a var in a page but the value is declared later after being included in the page.Is there any way to echo a var before I declare it? or some way to include the page withought running any of the code and just getting the var?

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Automate Variable Declaration ?

I want to try and write a function to automate some of the legwork in checking/declaring a variable i.e.

function checkVariable($var)

obviously, this isn't going to work, because the variable doesn't exist prior to declaration and throws an error when you use it as an argument - sooooo, is there a way of doing this?

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Variable Declaration In Scripting Languages?

In php/perl we can simply say $a='hi" and then $a=1 without needing to declare its type. But there are type casting errors in java for the same. Why this difference?

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Make Variable Declaration Optional In Codeigniter?

coming from a modular php programming environment i got used to using variables in php without regard of wether they were instantiated or not. i've been using codeigniter for around a month now and noticed that it is strictly implementing on not using a variable if they are undefined / undeclared.

i would like to know what's the purpose behind this and how does it differ from not really being strict about undeclared variables? is there a way that i can disable this feature in codeigniter in case i prefer to stick to using undeclared variables? and if so, what are the cons i'd get?

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Oop - Assign Session Variable To Class Variable While Initialize The Class Variable?

I have a problem regarding assign session variable to class variable while initialize the class variable.

Check my below code

class ModifyProfile
var $userType=$_SESSION['wb_user_type'];


so can i assign the session variable to class variable as above or not.

EDIT: What is the use of public, private and protected keyword while declaring class variable?

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Implicit Constructor Call

does php call the constructor of a class in its subclass automatic if i leave out the
constructor method of the subclass?

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Document Implicit Input Parameters, Such As $_SESSION?

If a function relies on $_SESSION['some_var'] then the header comment out to make that clear. How do you do it? Just as text, or what?Or even @param ?Edit: it looks like we settled on @uses ... but what if the fn() "returns" a $_SESSION variable?What if it "returns" multiple $_SESSION variables?

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Regular Expressions Error :: Illegal Mix Of Collations (utf8_general_ci,IMPLICIT)

Are mysql regular expressions supported in PHP 5.03? I've run the query via PHP and got an error, but the query works fine when put straight into mysql. I've not come across this error message before and don't know how to get around it, but I have heard about some incompatibility issues. Here's a sample query output from PHP:

SELECT prodName FROM tProducts WHERE `prodName` REGEXP '[[:<:]]chair[[:>:]]'

and the error:

Illegal mix of collations (utf8_general_ci,IMPLICIT) and (latin1_swedish_ci,COERCIBLE) for operation 'regexp'.

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#1267 - Illegal Mix Of Collations (latin1_swedish_ci,IMPLICIT) And (utf8_unicode_ci,COERCIBLE) For Operation 'like'

In my MySQL database I have encoded users in latin1_swedish_ci (bad idea). Now I connect my iPhone application to Facebook and retrieve the list of friend names, and I would like to see if I already have these friends in my application. Sadly when I try to do the query I get this error:

#1267 - Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8_unicode_ci,COERCIBLE) for operation 'like'

I try to mix the Facebook friend's name (in utf8) with the names in my dabatase (latin1). I don't want to migrate the whole database to utf8, I just would like to know if it's possible in PHP to check if the name encoding is compatible with latin1, or at least if it's possible to encode all the names in latin1 and do the query, and if not just skip the name.

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Track Existing Number Of Objects Of A Given Class Without Introducing A Non-class Member Variable?

i get some collection of solutions please help me to find correct one.
-> add member variable increment in default constructor and decrement in destructor.
-> add local variable that goes incremented in each constructor and decremented in destructor.
-> add static member variable that get incremented in each constructor and decremented in the destructor.
-> cannot be accomplished since the creation of the objects is being done dynamically via "new".

these are my four points select me the best.

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Class Inheritance In 5.2: Overriding Static Variable In Extension Class?

I need to bea be able to use a static variable set in a class that extends a base class.

class Animal {
public static $color = 'black';
public static function get_color()


This works wonderfully in PHP 5.3.x (Dog::get_color() prints 'brown') since it has late static binding. But my production server runs PHP 5.2.11 and so I need to adapt my script.

EDIT: this is a very much simplified example of what I am trying to accomplish. If I provide you with the two options I have used to solve my problem (and the problem itself) someone might have a different solution than I... I have built a base database model that contains functions like "find", "find_by" and "find_all" (all static).

In PHP 5.3 there is a function called get_called_class() which I currently use to determine the called class's name, and then use it to map against the correct database table. Ex class User would point to users. get_called_class() doesn't exist in PHP 5.2.x and the hack implementations I've found are very unreliable. Then I turned to this option of using a static variable in all model classes which contain the class name.

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Shared Variable Across Multiple Class Instances That I Can Change Outside The Class?

the code explains it better:

class Class{
$var = 0;

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Update Variable Of Parent Class From Child Class

I have a function in a child class which counts the number of SQL queries in a page load. In the child class which extends the parent class, after every: mysql_query($query);. I put parent::update_query_function();

where update_query_function() is:
function update_query_function(){

the $query_num variable in the parent class is not being updated. Why?

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Can't Access The Value Of A Public Variable In A 5 Class From Class Functions?

I'm using CodeIgniter 2.0 with PHP5.3.2 on Apache 2.2.14 with MySQL 5.1.48-community. I created a small test controller to isolate another problem and discovered that my problem appears to be caused by public variable accessibility. Calling test1 or test2 will result in errors because they can't see the value of the array elements set in the other functions. Does anyone have any idea why this doesn't work? If so, what is the solution as I need to be able to access class-wide variables.

class Test extends CI_Controller
public $data;
function __construct()

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Constant Member Of Class Called Using A Variable Name For The Class

Say, I have a const 'table_name' in derived class Girl. And, I want to get its value in base class Person. I'm currently returning the name of the derived class from a method call to my registry in the base class constructor. So, the below code works fine:

$class_name = $this->registry->loader->get_class_controller_main_name();echo $class_name::table_name;

However, I was wondering if there's any way to not have to first store the name of the derived class in a variable?

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