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@ 2020-08-08T04:49:33Z

<?php

$array = array (
    0 => 
    array (
        'id' => 1,
        'user_id' => 15,
        'booked' => '2020-08-01',
        'sendin' => '2020-08-03',
        'pickup' => '2020-08-08',
        'duration' => 5
    ),
    1 => 
    array (
        'id' => 2,
        'user_id' => 15,
        'booked' => '2020-08-01',
        'sendin' => '2020-08-03',
        'pickup' => '2020-08-08',
        'duration' => 5
    )
);

$user_id = 15;

$ids = array_map(function ($a) { return $a['id']; },
                 array_filter($array, 
                              function ($a) use ($user_id) {
                                  return $a['user_id'] == $user_id; 
                              })
                 );
print_r($ids);

$ids = array_map(function ($k) use ($array) { return $array[$k]['id']; },
                 array_keys(array_column($array, 'user_id'), $user_id)
                 );
print_r($ids);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => 1 [1] => 2 ) Array ( [0] => 1 [1] => 2 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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