I have two arrays. They look like these:

        $array1 = [
            [
                "filename" => "test1.pptx",
                "article" => "article",
                "category 1" => "cat1",
                "category 2" => "cat2",
                "category 3" => "cat3",
            ]
        ];

        $array2 = [
            [
                "filename" => "test1.pptx",
                "date" => "2023-08-29 11:05:59"
            ],
            [
                "filename" => "test1.pptx",
                "date" => "2024-01-29 12:05:59"
            ],

                 "filename" => "test1.pptx",
                 "date" => "2023-06-30 12:05:59"
            ]
        ];

The count of $array2 is approx. 300 and the count of $array1 is 40.
Both arrays have the key “filename” and it will match a lot of times. Each time it matches I want the values of the matched $array2 array and $array1 array stored in a new array.
“filename” should exist once in the new array.
So for this example it should to look like this:

       $mergedFileOutputs = [
            [
                "filename" => "test1.pptx",
                "article" => "article",
                "category 1" => "cat1",
                "category 2" => "cat2",
                "category 3" => "cat3",
                "date" => "2023-08-29 11:05:59"
            ],
            [
                "filename" => "test1.pptx",
                "article" => "article",
                "category 1" => "cat1",
                "category 2" => "cat2",
                "category 3" => "cat3",
                "date" => "2024-01-29 12:05:59"
            ],
            [
                "filename" => "test1.pptx",
                "article" => "article",
                "category 1" => "cat1",
                "category 2" => "cat2",
                "category 3" => "cat3",
                "date" => "2023-06-30 12:05:59"
            ],
        ];

I can’t seem to find a way to get an array with the amount of $array2 arrays just filled with the matched “filename” values of $array1.

Thanks in advance for any kind of help!

To achieve this I tried the following:

        $mergedFileOutputs = [];

        foreach ($array2 as $file2) {
            foreach ($array1 as $file1) {
                $filename = $file1['filename'];
                if ($file2['filename'] === $filename) {
                    $mergedFileOutputs[] =
                        [
                            'filename' => $array1['filename'],
                            'article' => $array1['article'],
                            'category 1' => $array1['category 1'],
                            'category 2' => $array1['category 2'],
                            'category 3' => $array1['category 3'],
                            'date' => $array2['date'],
                        ];
                }
            }
        }

Now the problem is that I receive 40 arrays that are correctly filled, which is the amount of arrays that are $array1.
Since I have a lot more $array2s I need this amount of arrays. I tried several options with array_merge and had the same results, so I posted this solution as it’s the most simple.