Alternate to Array_Column()

Alternate to array_column()

Add your own function array_column if you PHP version does not support it:

<?php
if (! function_exists('array_column')) {
    function array_column(array $input, $columnKey, $indexKey = null) {
        $array = array();
        foreach ($input as $value) {
            if ( !array_key_exists($columnKey, $value)) {
                trigger_error("Key \"$columnKey\" does not exist in array");
                return false;
            }
            if (is_null($indexKey)) {
                $array[] = $value[$columnKey];
            }
            else {
                if ( !array_key_exists($indexKey, $value)) {
                    trigger_error("Key \"$indexKey\" does not exist in array");
                    return false;
                }
                if ( ! is_scalar($value[$indexKey])) {
                    trigger_error("Key \"$indexKey\" does not contain scalar value");
                    return false;
                }
                $array[$value[$indexKey]] = $value[$columnKey];
            }
        }
        return $array;
    }
}

Reference:

Alternative to array_column function used as search

Add your own function array_column if you PHP version does not support it:

if (!function_exists('array_column')) {
function array_column($input = null, $columnKey = null, $indexKey = null)
{
    $argc = func_num_args();
    $params = func_get_args();

    if ($argc < 2) {
        trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING);
        return null;
    }

    if (!is_array($params[0])) {
        trigger_error(
            'array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given',
            E_USER_WARNING
        );
        return null;
    }

    if (!is_int($params[1])
        && !is_float($params[1])
        && !is_string($params[1])
        && $params[1] !== null
        && !(is_object($params[1]) && method_exists($params[1], '__toString'))
    ) {
        trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
        return false;
    }

    if (isset($params[2])
        && !is_int($params[2])
        && !is_float($params[2])
        && !is_string($params[2])
        && !(is_object($params[2]) && method_exists($params[2], '__toString'))
    ) {
        trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
        return false;
    }

    $paramsInput = $params[0];
    $paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null;

    $paramsIndexKey = null;
    if (isset($params[2])) {
        if (is_float($params[2]) || is_int($params[2])) {
            $paramsIndexKey = (int) $params[2];
        } else {
            $paramsIndexKey = (string) $params[2];
        }
    }

    $resultArray = array();

    foreach ($paramsInput as $row) {
        $key = $value = null;
        $keySet = $valueSet = false;

        if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) {
            $keySet = true;
            $key = (string) $row[$paramsIndexKey];
        }

        if ($paramsColumnKey === null) {
            $valueSet = true;
            $value = $row;
        } elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) {
            $valueSet = true;
            $value = $row[$paramsColumnKey];
        }

        if ($valueSet) {
            if ($keySet) {
                $resultArray[$key] = $value;
            } else {
                $resultArray[] = $value;
            }
        }

    }

    return $resultArray;
}

}

Reference:

Is there any function in jQuery that is equivalent to PHP's array_column()?

You can do it with .map(). Immagine a fetch of database rows.

With arrow function

To have a reusable arrayColumn(array, column) function:

const array = [
    {id: 1, name: 'foo'},
    {id: 2, name: 'bar'},
];
const arrayColumn = (array, column) => {
    return array.map(item => item[column]);
};
const names = arrayColumn(array, 'name');
console.log(names);

What is the equivalent of array_column in python3

You can use list comprehension:

In [11]: [e['_source'] for e in data]
Out[11]: [{'id': 1, 'price': 100}, {'id': 2, 'price': 150}, {'id': 3, 'price': 90}]

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

How do I get index of repeated data from multi dimension array in different variables using array_search() method

It is described in array_search manual:

function Search($value, $array) 
{ 
    return array_keys($array, $value, false); 
}

$array = array(45, 5, 1, 22, 22, 10, 10); 
$value = "10"; 
$indexes = Search($value, $array);
print_r($indexes);

You can see full documentation of array_keys here

php array_column with unsequential index returns wrong index

array_column() doesn't maintain indexes (although it allows you to set your own from other data columns in the row), but you can handle that using something like:

array_combine(
    array_keys($myarray),
    array_column($myarray,'columnbeingsearchedhere')
);

EDIT

Alternative, that probably grabs a bit more memory temporarily (unless you don't mind the original array being modified), but might be a bit faster overall (depending on your data):

$newArray = $myArray;
array_walk($newArray, function(&$value) use ($columnName) { $value = $value[$columnName]; } );

Isolate a single column in a multi-dimensional array

As of June 20th in PHP-5.5 there is a new function array_column

For example:

$records = array(
    array(
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe'
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith'
    ),
    array(
        'id' => 5342,
        'first_name' => 'Jane',
        'last_name' => 'Jones'
    ),
    array(
        'id' => 5623,
        'first_name' => 'Peter',
        'last_name' => 'Doe'
    )
);

$firstNames = array_column($records, 'first_name');
print_r($firstNames);

Will return

Array
(
    [0] => John
    [1] => Sally
    [2] => Jane
    [3] => Peter
)

There are even more examples in the above mentioned link.

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