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PHP - Collection Classes Help
hi,
i would like to find out if anyone has any examples of code for a collection class(alternative to array) thanks Similar TutorialsI've been spending long hours learning about classes and their magic methods. I just came across a tutorial which showed a constructor like this:
class Device {
//...
public function __construct(Battery $battery, $name) {
// $battery can only be a valid Battery object
$this->battery = $battery;
$this->name = $name;
// connect to the network
$this->connect();
}
//...
}
the Battery part instantly caught my attention. Here had previously made a Battery class (and a more complete Device class) but the next thing he did really caught my interest:
$device = new Device(new Battery(), 'iMagic'); // iMagic connected echo $device->name; // iMagicwhat the hell is going on here? Is this another way to include the methods and properties of one class into another class, in order words is this the same thing as: class Device extends BatteryI don't think so because this new Battery() thing looks more like its creating an object inside the Device object. Previously the only way I could to that was to type $battery = new Battery() inside one of my methods. But this looks like hes doing something different. Can anyone explain whats going on here? The whole tutorial is he http://code.tutsplus...-php--net-13085 in the main Device method he has a premade $battery variable to hold the Battery object. Sometimes I have multiple classes containing functions which I'd like to include in my main class. I can only extend one class, so I usually extent a class containing only properties, no methods. I still don't know what difference making that info class abstract is, I'd appreciate if anyone could tell me. Also I'd love to know what the point in static methods is. I've never used them because I've never seen the point. Is it just to make it easier to call the methods because you don't need to create an object instance to call them? Sorry for the extra questions, the first one is what I'm really wondering about. I can obtain either one or a collection of objects by executing the following.
$product = $entityManager->find('Product', $id);
$products = $entityManager->getRepository('Product')->findAll();
All products have many common properties, however, based on the type of product there are some differences. To implement this, I am using class table inheritance (side question - is there any difference between CTI and supertype/subtype modeling?). I will need to convert either a single product to JSON as well as a collection of products to JSON. When converting a collection, only a subset of the product's properties is desired, however, again most of these properties are common to each product type but there are some differences. One solution is to utilize the JsonSerializable interface. A shortcoming, however, is how to deal with both the detail view with all the properties and the collection view with only a subset of properties. To overcome this, I can potentially use jsonSerialize() to provide the detail view, and add another function index() to provide the subset results for the collection. Since this index() function will not recursively incorporate sub-objects, I will need to manually loop over the collection, however, it should not be too big of issue. Or should the entity not be responsible to convert to JSON? I am kind of mixed on this issue, but do agree using a separate class has merit. So, if a separate class is used, how does it deal with each subclass of Product which might have unique properties and getters? I suppose I can have the entities implement an interface which requires them to return their applicable properties, but doing so isn't very flexible and isn't this (almost) the same as having the entity responsible to provide the JSON? I "could" make this other class perform some switch operation based on the class name, but doing so goes against all good OOP principles. What is the "right" way to do this? Thanks I have a basic form for collecting data, I have a function for collecting the ip address of the visitors unfortunately I cannot get the ip collection working with the rest of the form once I put the if($_POST['emailaddress']) {.........} in. My aim is once the user has completed the form, data gone to MySQL database that the data will then be printed via the echo statements on to the form as the action sends it back to the same page. Currently my code is <?php /* This script is a form handler, each section is commented as to what it does. 1. connects to the database (see connect.php). 2. it gets the users ip address. 3. Strips tags from the data entered so that no malicious code can be entered and corrupt/cause problems with the database or site. 4. Inserts the relevant data into the database in this case it is the ip, haveemail, emailaddress, browser, otherbrowser, resolution, otherresolution. 5. Sends the data just entered by the user back to the screen so they can see what they entered */ // 1. connection to MySQL require ("php/connect.php"); // if this script is unavailable then the rest of the code is pointless as need a connection to the database. // if fields are completed if($_POST['emailaddress']) { // if this field has had data entered then process the data // 2. collect ip address //$ip = getRealIpAddr(); // 3. Strips tags and POST variables from the form $haveemail = strip_tags($_POST['haveemail']); $emailaddress = strip_tags($_POST['emailaddress']); $browser = strip_tags($_POST['browser']); $otherbrowser = strip_tags($_POST['otherbrowser']); $resolution = strip_tags($_POST['resolution']); $otherresolution = strip_tags($_POST['otherresolution']); // 4. insert data to dbase $query="INSERT INTO datacollection1 (id, ip, haveemail, emailaddress, browser, otherbrowser, resolution, otherresolution) VALUES ('Null', '$ip', '$haveemail', '$emailaddress', '$browser', '$otherbrowser', '$resolution', '$otherresolution')"; // Null is in the id field as this is added automatically in the database as it is set to auto increment upon an entry going in and is primary key. // message to say if database has been updated mysql_query($query) or die (mysql_error()); //echo "<b>Your IP address is: $ip</b> <br />"; /*function getRealIpAddr() { if (!empty($_SERVER['HTTP_CLIENT_IP'])) //check ip from share internet { $ip=$_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) //to check ip is pass from proxy { $ip=$_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip=$_SERVER['REMOTE_ADDR']; } return $ip; } */ // 5. displays information on form to advise what the user just entered echo '<br/>'."The database has just been updated with the following information: ".'<br/><br/>'; // echo "Your ip address is ".$ip.'<br/>'; echo "You answered ".$haveemail." to having an email address.".'<br/>'; echo "Your email address is ".$emailaddress.'<br/>'; echo "You use ".$browser." to browse the internet".'<br/>'; echo $otherbrowser.'<br/>'; echo "Your screen resolution is set at ".$resolution.'<br/>'; echo $otherresolution.'<br/>'; echo "Now you have completed this form, please follow onto the main form, this form seeks to get your valuable opinion regarding your likes and dislikes of the websites researched."; } mysql_close($db); // closes the database, this is good practice but the database will close once stopped running. ?> I have tried moving the function outside of the if($_POST['emailaddress']) but it still didnt get the ip address. Just as a side note everything else works, the data is written into the database bar the ip address. I would appreciate some help Thanks in advance. Anyone know why the following results in an error? Not a big deal as memory is not an issue and I can (and have) just changed it to create a new array instead of using a generator, but still curious. Thanks
<?php
foreach($doctrineCollection as $doctrineEntity){
yield new MyWrapper($doctrineEntity);
/*
After around 4 iterations, results in the following error:
syslog
Apr 06 15:25:25 myserver.net kernel: php-fpm[42889]: segfault at 7f8156a14100 ip 000055bb1d79acfd sp 00007ffd0b50a968 error 4 in php-fpm[55bb1d47c000+46e000]
/var/log/php-fpm/error.log
[Mon Apr 06 20:06:38.781360 2020] [proxy_fcgi:error] [pid 1501:tid 140210423629568] (104)Connection reset by peer: [client 12.345.67.890:45574] AH01075: Error dispatching request to :
/var/log/httpd/error_log
[06-Apr-2020 20:04:52] WARNING: [pool michael] child 5524 exited on signal 11 (SIGSEGV) after 0.138268 seconds from start
[06-Apr-2020 20:04:52] NOTICE: [pool michael] child 5526 started
*/
}
class MyWrapper
{
private $doctrineEntity;
public function __construct($doctrineEntity)
{
$this->doctrineEntity=$doctrineEntity;
}
}
Not sure how to describe what I'm trying to do here in the title, but here goes with what I am trying to accomplish. I've got a few hundred lines of code in total so far, so I'll try to keep it as short as I can. I've got an application that I am programming using classes for each module and right now I am coding the base classes that I need in order for it to run (database, errors, logging, etc). What I'm doing for my database class is I have a query factory and it extends the MySQLi class so I can process, clean and code the rest of my app faster. I also have another, unrelated class "Error", which will be used for processing errors I might come across. I'd rather do it this way instead of having to call trigger_error and error_log every time there is an error. I'd also not like to have to call a new instance of an object every time I need to use something from that class. Is there any way I can call a class within a class and return it as an object for all the methods within the class? I've tried the methods below, but no luck I've tried others, but I'm trying to keep it brief and get what I'm trying to do across. <?php class QueryFactory extends MySQLi { public $err = new error(); //Doesn't work. public $err = error(); //Nope. #This is the function that I need the $err object for. function set($fields, $newvals) { if ( is_array($fields) && is_array($newvals) ) { if ( count($fields) != count($newvals) ) { //Instead of below, I want to do something like $err->('Array lengths must match for method', 256, $islogged = 1); trigger_error('Array lengths must match for method', 256); } } } } The thing is, I have a "run.inc.php" which does include and create new objects for running just the basic app and if I try to redeclare the error class in query.class.php, it gives me an error saying I can't do that, but if i try to call $err from the page that has all the classes defined it throws an error saying that my method is undeclared. I'd like my error class be available to every other class I create so I can display and log errors as needed. Any suggestions or links to point me where I'd like to go? Hi. I want to know how I access calsses in PHP. I mean how I search for class that I want and need. do I need to search in php.net? and what editors that provide access the the whole php classes and who they keep updated? Cheers. im currently doing a large php project and i am confident i can do it. Its a basic forum like phpbb or mybb where users can download the files and instal. however i have looked through their code and i see they use classes. I have never learned to do classes since i havent had to use them yet. should i be using them now for this project? do i need to? and if so then what are the benefits? Hi, I want to build a simple calculator class and one of the function is to calculate the factorial, but for some reason I cannot get this to work. Here is class: ========= Code: [Select] <?php class Calculator { function factorial($n) { if($n==1) return 1; else return factorial($n-1)*$n; } }//END CLASS Calculator $calculator=new Calculator(); print $calculator->factorial(3); ?> But it doesn't work, I know this is simple but I am a little rusty with object oriented programming. I'd appreciated any help! If I have defined an instance of a class in one script how do I then use this same instance and the same variable in other scripts? For example say I have this code in a file called "index.php" include("myclass.class.php"); $myclass = new myClass; $myclass->$variable = "hello world"; However if I then have this code in a file called "page1.php" when I try to access the same variable it is empty. include("myclass.class.php"); echo($myclass->$variable) How can I use the same instance of this class across all files keep the variable values the same? Thanks for any help. Hi there,
This might a newbie question but I need help understanding PHP classes which am currently learning.
I have an index page.
With this three included files.
database.php
config.php
account.php
on database.php, the class is declared using $connection new Database(...), on this page is also all the coding for this class.
In config.php is a declared class of $account new Account($user_id);
and on account.php is all the details for the account class.
on the index.php is echo $account->sayHello;
However, My page is throwing out an error because I'm trying to use $connection->query(..) in my account.php / Account class.
I have tried to extend the Account class with Database but still have no luck.
How can I make sure the I can use a class function from another page in my Account class?
Thanks for reading
ini_set('display_errors', 1); error_reporting(E_ALL); class A { private function operation1() //only be used inside this class { echo 'operation1 called'; } protected function operation2() //only inside this class { echo 'operation2 called'; } public function operation3() //public can be used in any class { echo 'operation3 called'; } } class B extends A { function _construct() { //$this->operation1(); //$this ->operation2(); $this->operation3(); } } $b = new B; can someone please tell me why this code doesn't work ? How can i get my class to be showed on the front page here is the front page <?php require('ex2.php'); $start = new A(); $tart->Display(); ?> now here is ex2.php <?php ini_set('display_errors', 1); error_reporting(E_ALL); class A { public $title = "test1"; public $end = "test2"; } function __set($name, $value) { $this->$name = $value; } function Display() { echo $title; echo $end; } ?> shoudn't this print test1 and test2 ? Hello, maybe back to basics, but [PHP] pobierz, plaintext Take the following example: <?php class a { var $things; public function __construct($stuff) { $this->things = $stuff; } } class b { var $morethings; $this->morethings = "something"; } $c = new a(new b); echo $c->things->__PARENT__; ?> The line "echo $c->things->__PARENT__;" (as you can probably imagine) does not work. How would I output what the 'b' object is stored in ('a')? I have just start using PHP classes and was wondering how you continue an instance of a class in another file. For example I have a folder called "includes" where I includes files that I send data to when I perform ajax request. However how do I continue an instance of class in these files? Hope that makes sense. Thanks for any help. Hello All, I am fairly new to PHP class development, and I was wondering if it is normal behaviour to see classes not being able to access global variables related to PHP-based requests ($_GET, $_SESSION, etc.)? I seem to either have to use "global <var>" inside of the class to access the data, or I am forced to change the methods so then such required data is passed in as parameters. Perhaps I am just doing something wrong? Here is an example of what I mean: class Something { function aFunc() { if (isset($_SESSION['somedata'])) { return false; } // this always returns false whether I had set the value or not } function bFunc() { global $_SESSION; // figured this would already be in a global accessible scope if (isset($_SESSION['somedata'])) { return false; } // now this will return false only when the value is set } } Now the above example is commented to demonstrate what I was meaning above, and I was wondering if this was the 'norm' when developing classes for PHP (and thus such values should be passed as parameters)? Thanks! Hi, I am running a web server for which I place the php files in /var/www folder and they work fine from the browser. Now, I wish to use SSH2 class that can be found at (http://phpseclib.sourceforge.net/documentation/net.html#net_ssh_ssh2). I have placed SSH2.php in the same folder (/var/www) but it doesn't work. I have also copied the file in /usr/share/php (which is the path returned by ini_get('include_path') command). Where do I put my required file (SSH2.php) so that I can use it. Thanks Hi all, I'm struggling with a bit of logic here. What's the score on connection to a database inside of a class (PDO). I'm guessing it's bad practice and any queries should be passed as an array to the object - is this correct? What should I do with entering data into the DB? For example, say you have an orders class, one of the methods is to create the order, would you return an array from the method of all the data to be entered into the DB and then to enter back in the script? Getting pretty good at OOP, just need a little extra help. Have had a play with a framework (CodeIgnitor) but found it too limiting if that makes any sense - although I did like the MVC pattern. I'm looking for suggestions / recommendations for php classes that interact with Skype. It's a bit difficult to fully describe what I want to do, but think in terms of a internal customer support application leverages the functionality of Skype. We will need to do things like open Skype progamatically, monitor the elapse time and acquire that data for statistical analysis, things like that... I know Skype has an API, so I'm thinking someone has probably already written some classes that work with it... Naturally, I'm trying to avoid "reinventing the wheel". Anyone know about this sort of thing? |
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