Symfony 3 - 2 数组集合之间的区别

Question

有没有办法区分 2 ArrayCollection？（如array_diff）

今天我循环第一个并检查 $it->contains（） 是否匹配，但我认为它可以重构。

Answer 1

您可以

通过以下方式使用array_diff：

$diff = array_diff($arrayCollection1->toArray(), $arrayCollection2->toArray());
$arrayCollectionDiff = new ArrayCollection($diff);

Answer 2

我会提出以下建议：

由两个函数组成的类：

函数 getElementFromANotInB 给出 ArrayCollection A 中不在 ArrayCollection B 中的元素
• （也可以反过来用于从 B 中获取不在 A 中的元素）;
• 函数 getElementCommonInAAndB 给出了 ArrayCollection A 和 B 的常见元素。

这是类：

<?php
namespace [Bundle name]DependencyInjectionToolBoxArrayCollectionTB;
use DoctrineCommonCollectionsArrayCollection;
class ArrayCollectionTB {
    public function __construct(){}
    public function getElementFromANotInB(ArrayCollection $acA,ArrayCollection $acB){
        return $elementsInANotInB = $acA->filter(function($a) use ($acB) {
            return $acB->contains($a)===false;
        });
    }
    public function getElementCommonInAAndB(ArrayCollection $acA,ArrayCollection $acB){
        return $elementsCommonInAAndB = $acA->filter(function($a) use ($acB) {
            return $acB->contains($a)===true;
        });
    }
}
?>

这是它附带的测试类：

<?php
namespace Tests[Bundle name]DependencyInjectionToolBoxArrayCollectionTB;
use [Bundle name]DependencyInjectionToolBoxArrayCollectionTBArrayCollectionTB;
use DoctrineCommonCollectionsArrayCollection;
use PHPUnitFrameworkTestCase;
use SymfonyBundleFrameworkBundleTestKernelTestCase;
/**
* @coversDefaultClass [Bundle name]DependencyInjectionToolBoxArrayCollectionTB
*/
class ArrayCollectionTBTest extends KernelTestCase{
    private static $acA;
    private static $acB;
    private static $acTB;
    public static function setUpBeforeClass()
    {
        //start the symfony kernel
        $kernel = static::createKernel();
        $kernel->boot();
        //get the DI container
        $container = $kernel->getContainer();
        self::$acA = new ArrayCollection();
        self::$acB = new ArrayCollection();
        //acA and acB have in common 1,5
        //acA has 2 and 3 not in acB
        self::$acA->add('element 1');
        self::$acA->add('element 2');
        self::$acA->add('element 3');
        self::$acA->add('element 5');
        //acB has 4 and 6 not in acA
        self::$acB->add('element 1');
        self::$acB->add('element 4');
        self::$acB->add('element 5');
        self::$acB->add('element 6');
        self::$acTB = new ArrayCollectionTB();
    }
    /**
    * @covers ::getElementFromANotInB
    * @testdox test check dif give element from ArrayCollection A not in ArrayCollection B
    */
    public function testGetElementFromANotInB(){
        $res = self::$acTB->getElementFromANotInB(self::$acA,self::$acB);
        //result should be  2 and 3
        $this->assertNotContains('element 1',$res);
        $this->assertContains('element 2',$res);
        $this->assertContains('element 3',$res);
        $this->assertNotContains('element 4',$res);
        $this->assertNotContains('element 5',$res);
        $this->assertNotContains('element 6',$res);

    }
    /**
    * @covers ::getElementFromANotInB
    * @testdox test check dif give element from ArrayCollection B not in ArrayCollection A
    */
    public function testGetElementFromBNotInA(){
        $res = self::$acTB->getElementFromANotInB(self::$acB,self::$acA);
        $this->assertNotContains('element 1',$res);
        $this->assertNotContains('element 2',$res);
        $this->assertNotContains('element 3',$res);
        $this->assertContains('element 4',$res);
        $this->assertNotContains('element 5',$res);
        $this->assertContains('element 6',$res);
    }
    /**
    * @covers ::getElementCommonInAAndB
    * @testdox test check gives element from ArrayCollection A and ArrayCollection A
    */
    public function testGetElementFromBAndA(){
        $res = self::$acTB->getElementCommonInAAndB(self::$acB,self::$acA);
        $this->assertContains('element 1',$res);
        $this->assertNotContains('element 2',$res);
        $this->assertNotContains('element 3',$res);
        $this->assertNotContains('element 4',$res);
        $this->assertContains('element 5',$res);
        $this->assertNotContains('element 6',$res);
    }
}
?>

Answer 3

当 ArrayCollection 是一个对象数组时：

$collFoo = ArrayCollection($arrayOfFooObjects);
$collBar = ArrayCollection($arrayOfBarObjects);
$diff = $collFoo->filter(function (Foo $fooObject) use ($collBar) {
    return !$collBar->contains($fooObject);
});

简单array_diff引发错误：Error: Object of class Foo could not be converted to string