如何合并两个 php Doctrine 2 ArrayCollection()

How to merge two php Doctrine 2 ArrayCollection()

提问by Throoze

Is there any convenience method that allows me to concatenate two Doctrine ArrayCollection()? something like:

有什么方便的方法可以让我连接两个 DoctrineArrayCollection()吗？就像是：

$collection1 = new ArrayCollection();
$collection2 = new ArrayCollection();

$collection1->add($obj1);
$collection1->add($obj2);
$collection1->add($obj3);

$collection2->add($obj4);
$collection2->add($obj5);
$collection2->add($obj6);

$collection1->concat($collection2);

// $collection1 now contains {$obj1, $obj2, $obj3, $obj4, $obj5, $obj6 }

I just want to know if I can save me iterating over the 2nd collection and adding each element one by one to the 1st collection.

我只想知道我是否可以省去迭代第二个集合并将每个元素一个一个地添加到第一个集合中。

Thanks!

谢谢！

回答by pliashkou

Better (and working) variant for me:

对我来说更好（和工作）的变体：

$collection3 = new ArrayCollection(
    array_merge($collection1->toArray(), $collection2->toArray())
);

回答by Daniel Ribeiro

You can simply do:

你可以简单地做：

$a = new ArrayCollection();
$b = new ArrayCollection();
...
$c = new ArrayCollection(array_merge((array) $a, (array) $b));

回答by Matthias Brock

If you are required to prevent any duplicates, this snippet might help. It uses a variadic function parameter for usage with PHP5.6.

如果您需要防止任何重复，此代码段可能会有所帮助。它使用可变参数函数参数用于 PHP5.6。

/**
 * @param array... $arrayCollections
 * @return ArrayCollection
 */
public function merge(...$arrayCollections)
{
    $returnCollection = new ArrayCollection();

    /**
     * @var ArrayCollection $arrayCollection
     */
    foreach ($arrayCollections as $arrayCollection) {
        if ($returnCollection->count() === 0) {
            $returnCollection = $arrayCollection;
        } else {
            $arrayCollection->map(function ($element) use (&$returnCollection) {
                if (!$returnCollection->contains($element)) {
                    $returnCollection->add($element);
                }
            });
        }
    }

    return $returnCollection;
}

Might be handy in some cases.

在某些情况下可能会很方便。

回答by kanariezwart

$newCollection = new ArrayCollection((array)$collection1->toArray() + $collection2->toArray()); 

This should be faster than array_merge. Duplicate key names from $collection1are kept when same key name is present in $collection2. No matter what the actual value is

这应该比array_merge. 从重复的键名$collection1时相同的键名出现在保持$collection2。不管实际值是多少

回答by Stephen Senkomago Musoke

You still need to iterate over the Collections to add the contents of one array to another. Since the ArrayCollection is a wrapper class, you could try merging the arrays of elements while maintaining the keys, the array keys in $collection2 override any existing keys in $collection1 using a helper function below:

您仍然需要遍历集合以将一个数组的内容添加到另一个数组。由于 ArrayCollection 是一个包装类，您可以尝试在维护键的同时合并元素数组，$collection2 中的数组键使用下面的辅助函数覆盖 $collection1 中的任何现有键：

$combined = new ArrayCollection(array_merge_maintain_keys($collection1->toArray(), $collection2->toArray())); 

/**
 *  Merge the arrays passed to the function and keep the keys intact.
 *  If two keys overlap then it is the last added key that takes precedence.
 * 
 * @return Array the merged array
 */
function array_merge_maintain_keys() {
    $args = func_get_args();
    $result = array();
    foreach ( $args as &$array ) {
        foreach ( $array as $key => &$value ) {
            $result[$key] = $value;
        }
    }
    return $result;
}

回答by Manatax

Add a Collection to an array, based on Yury Pliashkou's comment (I know it does not directly answer the original question, but that was already answered, and this could help others landing here):

根据Yury Pliashkou的评论将 Collection 添加到数组（我知道它没有直接回答原始问题，但已经回答了，这可以帮助其他人登陆这里）：

function addCollectionToArray( $array , $collection ) {
    $temp = $collection->toArray();
    if ( count( $array ) > 0 ) {
        if ( count( $temp ) > 0 ) {
            $result = array_merge( $array , $temp );
        } else {
            $result = $array;
        }
    } else {
        if ( count( $temp ) > 0 ) {
            $result = $temp;
        } else {
            $result = array();
        }
    }
    return $result;
}

Maybe you like it... maybe not... I just thought of throwing it out there just in case someone needs it.

也许你喜欢它......也许不......我只是想把它扔在那里以防万一有人需要它。

回答by Валентин Анохин

Attention! Avoid large nesting of recursive elements. array_unique-has a recursive embedding limit and causes a PHP error Fatal error: Nesting level too deep - recursive dependency?

注意力！避免递归元素的大嵌套。array_unique -具有递归嵌入限制并导致PHP error Fatal error: Nesting level too deep - recursive dependency?

/**
 * @param ArrayCollection[] $arrayCollections
 *
 * @return ArrayCollection
 */
function merge(...$arrayCollections) {
    $listCollections = [];
    foreach ($arrayCollections as $arrayCollection) {
        $listCollections = array_merge($listCollections, $arrayCollection->toArray());
    }

    return new ArrayCollection(array_unique($listCollections, SORT_REGULAR));
}

// using
$a = new ArrayCollection([1,2,3,4,5,6]);
$b = new ArrayCollection([7,8]);
$c = new ArrayCollection([9,10]);

$result = merge($a, $b, $c);

回答by Juja

Using Clousures PHP5 > 5.3.0

使用闭包 PHP5 > 5.3.0

$a = ArrayCollection(array(1,2,3));
$b = ArrayCollection(array(4,5,6));

$b->forAll(function($key,$value) use ($a){ $a[]=$value;return true;});

echo $a.toArray();

array (size=6) 0 => int 1 1 => int 2 2 => int 3 3 => int 4 4 => int 5 5 => int 6