Массив объектов внутри класса в PHP
Недавно я понял, что мой подход к проекту в настоящее время значительно улучшится с использованием более / более описательных объектов. Таким образом, я понял, что хочу, чтобы массив объектов был членом другого класса.
Редактирование: Я не знал, что такое мой вопрос. Мой вопрос таков: как у меня есть массив в классе LogFile, который содержит объекты типа Match?
В конце концов я хочу иметь возможность сделать что-то вроде:
$logFile = new LogFile(); $match = new Match(); $logFile->matches[$i]->owner = “Brian”; Как мне сделать то, что я описал? Другими словами, что мне нужно сделать в классе LogFile для создания массива, который содержит объекты типа Match ?
class LogFile < public $formattedMatches; public $pathToLog; public $matchCount; public $matches = array(); >class Match < public $owner; public $fileLocation; public $matchType; >$l = new LogFile(); $l->matches[0] = new Match(); Это дополнение к ответу Брэда или Сваткинса . Вы написали:
что мне нужно сделать в классе LogFile для создания массива, который содержит объекты типа Match?
Вы можете создать «массив», который может содержать объекты соответствия. Это довольно легко, простираясь от ArrayObject и только принимая объект определенного класса:
class Matches extends ArrayObject < public function offsetSet($name, $value) < if (!is_object($value) || !($value instanceof Match)) < throw new InvalidArgumentException(sprintf('Only objects of Match allowed.')); >parent::offsetSet($name, $value); > > Затем вы LogFile класс LogFile который соответствует классу LogFile :
class LogFile < public $formattedMatches; public $pathToLog; public $matchCount; public $matches; public function __construct() < $this->matches = new Matches(); > > В конструкторе вы его настроили, новые Matches «Массив». Применение:
$l = new LogFile(); $l->matches[] = new Match(); // works fine try < $l->matches[] = 'test'; // throws exception as that is a string not a Match > catch(Exception $e) < echo 'There was an error: ', $e->getMessage(); > Демо – Надеюсь, это полезно.
Просто создайте другую общедоступную переменную для совпадений. Затем вы можете инициализировать его как массив в методе конструктора .
PHP не строго типизирован – вы можете поместить все, что угодно, в любую переменную. Чтобы добавить к совпадениям, просто выполните $logFile->matches[] = new Match(); ,
Затем, когда вы хотите добавить в массив:
$matches[] = $match; // $match being object of type match Вы можете использовать объект SplObjectStorage поскольку он предназначен для хранения объектов.
PHP5. Two ways of declaring an array as a class member
I’d suggest doing this when declaring a class variable. A constructor can be overriden in extending classes, which might result in E_NOTICEs or even E_WARNINGs if any of your functions depend on this variable being an array (even an empty one)
If you are going to populate your array dynamically during initialization, do it in the constructor. If it contains fixed values, do it in the property declaration.
Trying to populate an array dynamically (e.g. by using the return value of a certain function or method) within the declaration results in a parse error:
// Function call is not valid hereprivate $paths = get_paths();Performance is not a real concern here as each has its own use case.
In general, because I write mostly in other languages besides PHP, I like to declare my instance variables outside of the constructor. This let’s me look at the top of a class and get an idea for all properties and their access modifiers without having to read the code.
For example, I really don’t like methods like this
// . // whole bunch of code// . public function initialize() < $this->foo = array(); // some other code to add some stuff to foo>Now, if I just look at the class, I can’t be sure there is a variable foo even available. If there is, I don’t know if I have access to it from anywhere outside the instance.
at the top of my class, I know that foo is an instance property, and that I can access it from elsewhere.
PHP5. Two ways of declaring an array as a class member
I’d suggest doing this when declaring a class variable. A constructor can be overriden in extending classes, which might result in E_NOTICEs or even E_WARNINGs if any of your functions depend on this variable being an array (even an empty one)
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There are no performance implications. Stop obsessing over things that don’t matter — concentrate on performance problems that ARE there: measure first, optimize only the top offenders.
In general, because I write mostly in other languages besides PHP, I like to declare my instance variables outside of the constructor. This let’s me look at the top of a class and get an idea for all properties and their access modifiers without having to read the code.
For example, I really don’t like methods like this
// . // whole bunch of code // . public function initialize() < $this->foo = array(); // some other code to add some stuff to foo > Now, if I just look at the class, I can’t be sure there is a variable foo even available. If there is, I don’t know if I have access to it from anywhere outside the instance.
at the top of my class, I know that foo is an instance property, and that I can access it from elsewhere.
sberry 123885
If you are going to populate your array dynamically during initialization, do it in the constructor. If it contains fixed values, do it in the property declaration.
Trying to populate an array dynamically (e.g. by using the return value of a certain function or method) within the declaration results in a parse error:
// Function call is not valid here private $paths = get_paths(); Performance is not a real concern here as each has its own use case.
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