CODEWITHSUNDEEP
phpsymfonycommandphp-7
Syllz
Syllz

Reputation: 340

PHP 7 - Warning: array_column() expects parameter 1 to be array, object given

I just found something weird in my project. I am using PHP7.3 and I am trying to make use of the array_column() function with objects.

I am using a command to call a service in a symfony project - if that matters, however I have simplified my code to the minimum important.

Article.php:

class Article {
    private $id;
    private $category;

    public function __construct()
    {
        $this->category = new ArrayCollection();
    }

    public function getCategory(): Collection
    {
        return $this->category;
    }

    public function addCategory(ArticleCategory $category): self
    {
        if (!$this->category->contains($category)) {
            $this->category[] = $category;
        }

        return $this;
    }

    public function removeCategory(ArticleCategory $category): self
    {
        if ($this->category->contains($category)) {
            $this->category->removeElement($category);
        }

        return $this;
    }
}

ArticleCategory.php

class ArticleCategory
{
    private $id;
    private $name;

    public function getName(): ?string
    {
        return $this->name;
    }

    public function setName(string $name): self
    {
        $this->name = $name;

        return $this;
    }

I am trying to get the categories of an article as an array - for this case I use following:

$categories = array_column($a->getCategory(), 'name'); //$a is the article object

However this throws following warning: Warning: array_column() expects parameter 1 to be array, object given

What I already tried

However none of this works for me. Even though array_column should work with objects in PHP >7 ? I appreciate any help

Upvotes: 1

Views: 6668

Answers (1)

Ihor Kostrov
Ihor Kostrov

Reputation: 2561

If you need array use this $categories = $a->getCategory()->toArray();

If you you need array of category names - use array map

$categoriesName = $a->getCategory()->map(function(ArticleCategory $category) { 
    return $category->getName(); 
});

Upvotes: 7

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