PHP Classes

PHP Auto Dependency Injection: Create objects classes and dependent classes

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Description 

Author

Aleksandar Zivanovic

This class can create objects classes and dependent classes.

It can create a new instance of a given class or return a previously created instance of that class.

The class uses reflection to determine what are the dependent classes by looking at the type hinting classes passed as class function parameters.

The class can also automatically invoke a given function of a class passing instances of the respective classes specified in the type hinting.

Innovation Award
PHP Programming Innovation award nominee
March 2016
Number 16

Prize: One year server license IP to country, region, city, latitude, longitude, ZIP code, time zone, area code database		 Nowadays, with type hinting it is possible to determine the types of values that a class expects on each call.

This class can automatically create objects of classes and any dependencies using Reflection to determine what the classes expect when calling its function.

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Example

<?php

class ExampleA
{
    public $variable;
}

class ExampleB
{
    public $exampleA;

    public $uniqueId;

    public function __construct(ExampleA $exampleA)
    {
        $this->exampleA = $exampleA;

        $this->exampleA->variable = uniqid();
    }
}

class ExampleC
{
    public function methodWithDependencies(ExampleA $a, ExampleB $b, $customInteger, $customString)
    {
        var_dump($a->variable, $b->uniqueId, $customInteger, $customString);
    }
}

// Creates new instance of ExampleB and returns it
$exampleBOne = AutoDi::getInstance(ExampleB::class);

// Gets already created instance of ExampleB (Singleton)
$exampleBTwo = AutoDi::getInstance(ExampleB::class);

// Creates new instance of ExampleB without affecting previous
$exampleBThree = AutoDi::getNewInstance(ExampleB::class);

// Set value in $exampleBOne
$exampleBOne->uniqueId = 'this value SHOULD NOT be printed out!!!';

// Set value in $exampleBThree
$exampleBThree->uniqueId = 'this value is for itself';

// Set value in $exampleBTwo
$exampleBTwo->uniqueId = 'this value SHOULD be printed out!!!';

// Executes method "methodWithDependencies" from object (ExampleC)
// last argument are parameters of method that are scalar type or non typed
// e.g:
//
// methodWithDependencies(ExampleA $a, ExampleB $b, $customInteger, $customString)
// AutoDi will inject first and second parameter (ExampleA and ExampleB) and use
// values from array that is last argument of AutoDi::autoInvoke
//
// if method looked something like this
// methodWithDependencies(ExampleA $a, $customInteger, ExampleB $b, $customString)
// AutoDi will map non typed parameters with array elements, so $customInteger and $customString
// will be same as in previous example because of order
AutoDi::autoInvoke(AutoDi::getInstance(ExampleC::class), 'methodWithDependencies', [1, 'string']);

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Plain text file AutoDi.php Class Class itself
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