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PHP - Reusing Objects
I know it is often frivolous, but sometimes I can't help trying to optimize things, and use the following two methods to create either an object injected with a string or one of a set of objects. For both cases, the class has no setters so there is no chance that the object will later be changed. I first stated doing this in continuously running server applications which I believe makes sense, however, it has leaked over to standard HTTP requests. Please commit good or bad on this approach. Thanks
public static function create(string $unit):self
{
static $stack=[];
if(!isset($stack[$unit])) {
$stack[$unit] = new self($unit);
}
return $stack[$unit];
}
public static function create(string $class):FunctionInterface
{
static $stack=[];
if(!isset($stack[$class])) {
$stack[$class] = new $class;
}
return $stack[$class];
}
Similar TutorialsI am new to php and would like help understanding Sessions and session variables. When should I or should I not make my php, sessions? I have this Idea that by creating all my documents sessions It will always be easier to reuse all my session variables in other documents. Is this ok or is there a way to use variable in other documents without making a session? I want to code correctly and professionally but I don,t want to become a creature of BAD HABIT. Hello all!
I have this array of objects:
Array
(
[0] => stdClass Object
(
[first_name] => test
[last_name] => test
[title] => test
[id] => 34
[type] => 4
[manager] => 4
[email] => p@yahoo.com
[date] => 2014-09-21 07:23:12
[status] => 2
[approval_date] => 2014-09-21 07:31:10
[assessment_id] => 1
[supervisor_approval] => 1
[manager_approval_date] => 2014-09-21 07:31:27
[mainmanger] => 3
)
[1] => stdClass Object
(
[first_name] => test
[last_name] => test
[title] => test
[id] => 34
[type] => 4
[manager] => 4
[email] => p@yahoo.com
[date] => 2014-09-20 07:39:55
[status] => 2
[approval_date] => 2014-09-20 07:40:41
[assessment_id] => 3
[supervisor_approval] => 1
[manager_approval_date] => 2014-09-20 07:41:07
[mainmanger] => 3
)
[2] => stdClass Object
(
[first_name] => jimmy john john
[last_name] => john
[title] => Lorad and Master
[id] => 32
[type] => 4
[manager] => 3
[email] => j@j.com
[date] => 2014-09-21 07:38:50
[status] => 2
[approval_date] => 2014-09-19 07:39:25
[assessment_id] => 2
[supervisor_approval] => 1
[manager_approval_date] => 2014-09-19 07:39:25
[mainmanger] => 0
)
)
Where "id" = the user ID.
If there are two or more entries for a user, I want to remove all but the most recent by the "approval_date",... So for the above example it would return:
Array
(
[0] => stdClass Object
(
[first_name] => test
[last_name] => test
[title] => test
[id] => 34
[type] => 4
[manager] => 4
[email] => piznac@yahoo.com
[date] => 2014-09-21 07:23:12
[status] => 2
[approval_date] => 2014-09-21 07:31:10
[assessment_id] => 1
[supervisor_approval] => 1
[manager_approval_date] => 2014-09-21 07:31:27
[mainmanger] => 3
)
[1] => stdClass Object
(
[first_name] => jimmy john john
[last_name] => john
[title] => Lorad and Master
[id] => 32
[type] => 4
[manager] => 3
[email] => j@j.com
[date] => 2014-09-21 07:38:50
[status] => 2
[approval_date] => 2014-09-19 07:39:25
[assessment_id] => 2
[supervisor_approval] => 1
[manager_approval_date] => 2014-09-19 07:39:25
[mainmanger] => 0
)
)
I'm having a hard time wrapping my head around this concept, so I don't have any example code. And I don't really need or expect someone to code this for me,. just a push in the right direction would be awesome.
Hi, I am having some trouble re-using a method of a class which I use to setup my pages. I have an include which instantiates the class and then I make a call at the top of each page depending on the content required. I have several javascripts I want to include for a specific page and would like to just keep calling the same method to load them. If I try to call the method twice on the last one is echoed. I don't really want have to write out different methods for each file I may need. Any help much appreciated. The included class has this: Code: [Select] class Page { public function display_top() { # page specific atrributes $this->display_js(); } public function display_js() { echo "<script type='text/javascript' src='{$this->js}'></script>\n"; } } my page has this: Code: [Select] require ('classes/page_class.php'); $page = new Page; $page->js = "js/jquery-1.3.2.min.js"; $page->js = "js/revealClass.js"; I am creating a webpage for my golf league and some of the information(variables) such as Name, Address and email, must be reused across multiple pages for different outputs. May question is "Can I, or is there a way to reUse variables across multiple pages. "Do I need to create a session and make everything session variables"? "Should I link to a database and call the information when needed"? Any explanation would be greatly appreciated. I have the following three tables (and also delta_point and hist_point which are purposely left out and just mentioned for context). Before going down the Doctrine ORM long curvy road, aggrType was just used to restrict possible values so that I didn't need to use MySQL's ENUM, but now I am thinking there may be value to making it an entity and include some methods (and a second reason because I still can't figure out how to make Doctrine create a FK constraint yet not populate the parent entity with a AggrType object). point -id (int PK) -data -dType /* descriminator. Options are AggregatePoint, DeltaPoint, and HistoricPoint */ aggr_point -id (int PK, FK to point) -aggrType (char FK to aggrType) -data aggrType -type (char PK) /* there are about five types */ I have a service to create a new point based on the provided desired type and user data. I don't like the switch statement to determine which type of point to create, but don't know a better way. Also my entity is responsible to provide the appropriate validation rules for the given point type which might not be considered proper but it seems to work for me. Any constructive criticism is welcomed.
<?php
namespace NotionCommotion\PointMapper\Api\Point;
use NotionCommotion\PointMapper\Domain\Entity\Point;
class PointService
{
public function create(string $type, array $params):integer {
$class=[
'aggr'=>'AggregatePoint',
'delta'=>'DeltaPoint',
'hist'=>'HistoricPoint',
][$type];
//$class='Point\\'.$class; //This doesn't seem to be possible and I needed to use the fully qualifed name without the short cut used namespace.
$class='\\Greenbean\Datalogger\Domain\Entity\Point\\'.$class;
$point=new $class();
$validator=$this->getValidator($point);
$params=$validator->sanitize($params);
$validator->validate($params);
$point->setAccount($this->account);
$point->populate($params, $this->em); //Will be addressed later
$this->em->persist($point);
$this->em->flush();
$point->setIdPublic($this->em->getRepository(Point\Point::class)->getPublicId($point->getId()));
return $point->getIdPublic();
}
}
Now, this is the part I am struggling with the most. I only have one service to create any type of point, so I do wish to put a bunch of if/thens in it and instead move logic to the individual point type being created. The AggrPoint in question requires a sub-point and I don't think it is appropriate to inject the entity manager into a point entity and as an alternative solution find an existing point which is associated with the account which resides in the new AggrPoint. Maybe not appropriate, but it works. This type of point also has a sub-object AggrType as discussed at the very beginning of this post, so I first attempt to create a new one from scratch, but that doesn't work and I need to set $aggrType with an existing one. As an alternative, I passed the entity the entity manager, but as stated I think this is a bad idea. Any recommendations where to go from here? Thank you
namespace NotionCommotion\PointMapper\Domain\Entity\Point;
class AggregatePoint extends Point
{
public function populate(array $params, \Doctrine\ORM\EntityManager $em):\NotionCommotion\PointMapper\Domain\Entity\Entity{
$criteria = \Doctrine\Common\Collections\Criteria::create()
->where(\Doctrine\Common\Collections\Criteria::expr()->eq("id_public", $params['pointId']));
if(!$subpoint = $this->getAccount()->getPoints()->matching($criteria)->current()){
throw new \Exception("Invalid subpoint ID $params[pointId]");
}
$this->setSubpoint($subpoint);
//This won't work since I must use an existing AggregateType and not create a new one
$aggrType=new AggregateType();
$aggrType->setType($params['aggrType']);
//This just seems wrong and I shouldn't be passing the entity manager to an entity
$aggrType=$em->getRepository(AggregateType::class)->findOneBy(['type'=>$params['aggrType']]);
$this->setAggregateType($aggrType);
unset($params['pointId'], $params['aggrType']);
// parent::populate($params) not shown, but it basically calles appropriate setters based on the property name
return parent::populate($params);
}
public function getValidatorRules():array
{
return $this->filesToArr(['/point/base.json', '/point/aggr.json']);
}
}
hey gurus, i am a newbie php coder.. i am learning by example. what i am trying to do is write a piece of code which will alter 3 tables (user, bonus_credit, bonus_credit_usage) ---------------------------------------------------------------- the table structure that will be used is as follows: user.bonus_credit user.ID bonus_credit.bonusCode bonus_credit.qty bonus_credit.value bonus_credit_usage.bonusCode bonus_credit_usage.usedBy ---------------------------------------------------------------- so lets say, in bonus_credit i have the following bonusCode = 'facebook' (this is the code they have to type to redeem the bonus qty = '10' ( number of times the bonusCode can be redeemed, but same person can't redeem it more than once) value = '5' (this is the amount of bonus_credit for each qty) Now, I need to write a code that check to see if the code has been redeemed in the bonus_credit_usage table and if the user.ID exists in this table as bonus_code_usage.usedBy, then give an error that its already been used and if it hasn't been used, then subtract 1 from qty, add ID to usedBy and then add the value to the bonus_credit ----------------------- i have started the steps just to create a simple textbox and entering a numeric value to bonus_credit, and that works.. but now i have to use JOIN and IF and ELSE.. which is a little too advanced for me.. so i'd appreciate a guide as i write the code. if(isset($_REQUEST['btnBonus'])) { $bonus_credit = addslashes($_REQUEST['bonusCode']); $query = "update user set bonus_credit=bonus_credit+'".$bonus_credit."' where id='".$_SESSION['SESS_USERID']."'"; echo "<script>window.location='myreferrals.php?msgs=2';</script>"; mysql_query($query) or die(mysql_error()); } Hi I am new to PHP and I need to create an array and add both books to the array and than loop through the array this is where I am having trouble if the price of a book is less than $20.00 output the book’s name and price if the book’s title comes after the letter R in the alphabet output the book’s title. I am getting these error:
Notice: Trying to get property 'price' of non-object in C:\xampp\htdocs\PHP objects\books.php on line 45 My code is:
<?php
// Methods
$first_book = new Book();
foreach ($book as $bookItem) { Any help will be very much appreciated Thank you In a relational database, you "link" tables together. For example, Customer (parent) ---> Product (child) How do you do that with Objects? I have a "User" class and an "AddressBook" class. A User can have zero or more Addresses (in their AddressBook). If I create a User object and an AddressBook object, I need a way to link them up similar to how they are linked up in the database. Make sense?! TomTees I took an object, and saved it into a database serialized. Code: [Select] $object_here = serialize($theobject); Then later on, I go and I get that data from a database, and try to unserialize it.. Code: [Select] $objecthere = unserialize($row->theobject) And it throws the following error...any advice? Quote Warning: unserialize() [function.unserialize]: Node no longer exists in /path/to/file on line 20 I found it helpful to configure all my objects in one or several bootstrap scripts. Before doing so, I would often find myself forgetting that I already had written some class which is located deep in some script and recreating it for some other need (granted, composer definitely helped in this regard, but using it wasn't always applicable).
<?php
$c=new Pimple\Container(getMySettings());
$c['pdo'] = function ($c) {
$db = $c['settings']['mysql'];
return new \PDO(bla);
};
$c['foo'] = function ($c) {
return new Foo(
$c->get('pdo')
);
};
$c['bar'] = function ($c) {
return new Bar(
$c->get('foo')
);
};
It is all good until I find myself needing to create some new instance of some class instead of just passing some common instance to whoever needs it.
class Foo
{
private $pdo;
public function __construct(\PDO $pdo)
{
$this->pdo=$pdo;
}
public function getSomething():SomeClass
{
return new SomeClass($this->getAllDataFromDB($GET['id']));
}
}
class SomeClass
{
private $arr;
public function __construct(array $records)
{
foreach($records as $record) {
$arr[]=new SomeOtherClass($record);
}
}
}
I've read that one shouldn't create new objects in a given class's constructor, and while I could instead do so in some class's method and pass the object to the given class's constructor, to me it seems to really be the same thing. The three issues I have with this scenario a Needing to remember that these classes exist as they are hidden deep in some classes. Makes it more difficult to replace one of the classes with some other class in the future. Some duplication of code.Are there other compelling reasons not to do so? Is it worth the effort to do differently? If so, how would you recommend doing so? My thoughts would either to use Pimple's factory() method are create my only factory which also relies on anonymous functions. Maybe something else?
$c['someClass'] = $c->factory(function (array $record, Container $c) {
return new SomeClass($record);
});
Thanks Hi all,
I am working with the following 2 page script: https://github.com/k...hi/php-riot-api. All works well and the data is pulled via the API as intended. However, depending on the data I'm trying to display on screen, the object contains multiple values.
For example:
$r = $test->getSummoner($summoner_id,'name'); print_r($r);outputs their ID and name: {"585897":"TheirName"} Just as the following: $r = $test->getSummonerByName($summoner_name); print_r($r);outputs username, ID, Name, profile icon ID, level, and timestamp: {"theirname":{"id":585897,"name":"TheirName","profileIconId":642,"summonerLevel":30,"revisionDate":1405652924000}} Depending on which function I am calling (on example.php), I would like to be able to split the values so I can echo them throughout a page: Name: <value> ID: <value> Level: <value> etc... Any guidance would be appreciated. Hello, Can anyone help me with this. To put it simply. Class foo { protected $bar = new Moo(); How can i use this object (And it's methods) inside the methods of that class. So function whatNot (){ $this->bar->Doesn't work. } } I hope you can get my general meaning. What is the better way, in terms of best practice and also speed of storing PHP objects in a database? Is it: Serialize Code: [Select] $SQL = "INSERT INTO my_table (my_object) VALUES ('" . seralize($php_object). "')"; OR JSON Code: [Select] $SQL = "INSERT INTO my_table (my_object) VALUES ('" . json_encode($php_object). "')"; Any idea which is faster serialize() / unserialize() or json_ecode() / json_decode()? Hello everyone. Before I start, I'm relivily new to PHP but have been doing it for a few weeks or so, my latest problem that i've been trying to crack for a few days now is using the "imagecopy" command in php, I'm working on an avatar script that lets users design there own avatar, selecting clothes, hair, eyes, etc. I've only just started and i've ran into a rather large problem so don't seem to be able to move any further, This is the code i have Quote <?php ob_start (); /* background */ $bg = imagecreatefrompng('bg.png'); /* foreground */ $fg = imagecreatefrompng('fg.png'); /* frontground */ $fgg = imagecreatefrompng('fgg.png'); $x = imagesx($bg); $y = imagesy($bg); imagecopy($bg, $fg, $fgg, $x, $y); header('Content-Type: image/png'); imagepng($bg); imagedestroy($bg); imagedestroy($fg); imagedestroy($fgg); ?> However for some reason, probably a simple fault, it's just giving me a broken image link? I'm not sure why it's doing this if you want to see exactly what it's doing please look at http://chat.blastgames.org/index.php Like i say i'm clueless so any help would be much appreciated, Also if anyone knows of any downloadable php avatar scripts that lets you customize things like hair, clothes etc. please tell me, I've been searching for one for a while, Thanks for reading , Any help will be much appreciated. Hello, i been making a site to learn some PHP. I been always searching about what's the best way of using the PHP functions, classes and objects but i have a small question that i couldnt found the awnser by my self. so far i m inicializing an PHP class like this: 1st case Code: [Select] $themeobj = new theme(); Today i found an tuturial that used an other way of calling an function inside the class: 2nd case Code: [Select] theme::loadTheme; I understand that the way i m doing, your iniciating the variable $themeobj as an object of the class theme and that the theme:loadTheme just calls the function loadTheme inside the theme class (please correct me if i m wrong), but here's where is where i need abit of enlightment. Using the 2nd case will "skip" the loading of the __construct function? when should you use the 1st case or the 2nd case? Every time i needed an function from theme i would use $themeobj->loadTheme($param) its safe to use theme::loadTheme($param)? Thanks in advance I have gotten into the habit of freeing MySQLi result objects once they are no longer needed. However, I'm curious about the cases where multiple MySQLi objects are being used. I can post some code once I am back at my laptop but for now thinking about this is keeping me awake in bed and all I have handy is my phone. Anyway, I am new to OOPHP. I have a class that I created. I have two objects/instances of it, each using some of the same and some different methods within the class. When I run the page either of the instances works great alone but I get the white screen of death when I try to use both instances at the same time. Any ideas or places I should start? Hi I am trying to connect to my database but i am having some problems where the server( WAMP) crashes and does not load this page. here is the php coding
<?php
$db = new PDO("mysql:host=localhost;dbname=test;port=80", "root", "");
var_dump($db);
when i run this no error comes the page doesnt load. anyone know why? when using PDO do i have to do some sort of configuration changes to wamp? i have even changed the directory of the file and still same issue. any suggestions would be wonderful.
Ever since I started using OOP this past week, I have not been able to go back to the old "procedural" methods. HOwever, I seem to be stuck on creating a mysql connection that I can reuse in all of my classes. After I set up a connection to mysql using the mysqli object, I am unable to use the mysqli in other objects. Code: [Select] $mysqli = new mysqli(.....); class new_class { function quickQuery () { $mysqli->query('some query') } } Obviously, this doesn't work, because $mysqli is not defined within that functions scope. One way, is to use global keyword. Code: [Select] global $mysqli However, globals "are the root of all evil" and simply go against the idea of encapsulation in OOP. What's a way around this? HOWEVER: 1) I still want to use the mysqli object 2) I don't want to reference the $link of the db each time I instantiate a new class .... Maybe I'm asking too much? And I've google for the past hour or so. Singleton seems interesting but it requires the creation of a new db connection class. I want to use the mysqli object. Hi guys, I am currently building a customer appointment booking system with PHP. Customers who are added are store on a customer database and displayed or listed as links dynamically in a 'customer.php' page. So you can click on a customer to view their profile i.e. name, address, time added, an so on. Also there is a button to 'create appointment' for the customer. Click the button, a form appear, select a day and time the click submit. It all works fine. The problem is once the appointment is booked I dont how to remove the customer from the list on the customer.php page. So am looking for something like what they have on e-commerce sites e.g a customer buys an item and that item is no longer available for another customer. Please guys am calling for your expertise, any ideas, inputs or suggestions you may have are more than welcome. Thanks |
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