Php. How to Use Array_Column with an Array of Objects

PHP. Is it possible to use array_column with an array of objects

PHP 5

array_column doesn't work with an array of objects. Use array_map instead:

$titles = array_map(function($e) {
    return is_object($e) ? $e->Title : $e['Title'];
}, $records);

PHP 7

array_column()

The function now supports an array of objects as well as
two-dimensional arrays. Only public properties are considered, and
objects that make use of __get() for dynamic properties must also
implement __isset().

See https://github.com/php/php-src/blob/PHP-7.0.0/UPGRADING#L629 -
Thanks to Bell for the hint!

array_column with an array of objects

$array = array_combine(array_map(function ($o) { return $o->id; }, $array), $array);

Whether this is really a lot better than a simple foreach loop, aside from "but, but, functional programming...!", is debatable.

PHP, array of objects, how can I use one set of object values as the array keys

As of PHP 7, you can use array_column() on objects, with the third parameter as the column to index by...

$questions = array_column($data, "name", "id");

array_column not working for an array of objects?

v7.0.0: Added the ability for the input parameter to be an array of objects.

Source: https://secure.php.net/manual/en/function.array-column.php

array_column doesn't work with first key in nested array

This is a recursive function which at each point checks if the key matches the required one, if so it returns the value, if not it will look in elements which are also arrays (which is where the recursive bit comes in) and return if a match is found there...

function nested_array_key_search ( array $array, $key ) {
    foreach ( $array as $elementKey => $element )  {
        if ( $elementKey === $key ) {
            return $element;
        }
        if ( is_array($element) )   {
            $nested = nested_array_column ( $element, $key );
            // If the recursive call returns a value
            if ( $nested !== false )    {
                return $nested;
            }
        }
    }
    // Not found, return false
    return false;
}
$bar = nested_array_key_search($array, 2);

print_r($bar);

gives...

Array
(
    [5] => Array
        (
            [7] => Array
                (
                    [46] => Array
                        (
                        )

                )

        )

    [108] => Array
        (
        )

)

PHP - Extracting a property from an array of objects

If you have PHP 5.5 or later, the best way is to use the built in function array_column():

$idCats = array_column($cats, 'id');

But the son has to be an array or converted to an array

Isolate a specific column of values in an array of objects

I would suggest array_map().

$original_array; // your original array
$rid_array = array_map(function($val) {
    return $val->rid;
}, $original_array);

Or for PHP < 5.3

$original_array; // your original array
$rid_array = array_map('map_function', $original_array);

function map_function($val) {
    return $val->rid;
}

A shorthand and brief way to collaps array of objects in PHP

Yes, you can use array_column
https://www.php.net/manual/en/function.array-column.php

Get multi column from array php, Alternate of array_column

There is custom function to achieve this,

public function filterArrayByKeys(array $input, array $column_keys)
{
    $result      = array();
    $column_keys = array_flip($column_keys); // getting keys as values
    foreach ($input as $key => $val) {
         // getting only those key value pairs, which matches $column_keys
        $result[$key] = array_intersect_key($val, $column_keys);
    }
    return $result;
}

$a = $this->filterArrayByKeys($students, ['id','name','email']);
print_r($a);

array_flip — Exchanges all keys with their associated values in an array

array_intersect_key — Computes the intersection of arrays using keys for comparison

Output

Array
(
    [0] => Array
        (
            [id] => 498
            [name] => Andrew A. Blaine
            [email] => student14@gmail1.com
        )

    [1] => Array
        (
            [id] => 499
            [name] => Billie C. Heath
            [email] => student15@gmail1.com
        )

)

Working demo.

Source.

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