Loop only certain array key in PHP

Question

How can I loop to display the values of array key type without looping other keys because am have more than 500 array lines and reduce time.

$details = array(
    array('year' => '1990'),
    array('year' => '1995'),
    array('condition' => 'working'),
    array('type' => 'bus'),
    array('type' => 'car'),
    array('type' => 'bike'),
);

There is no clever way without touching all the records I guess — Ivan Yonkov
– Ivan Yonkov, Commented May 27, 2014 at 8:30
If possible consider changing your data structure i.e. $details['type'] = array('bus','car','bike') — FuzzyTree
– FuzzyTree, Commented May 27, 2014 at 8:37

h2ooooooo · Accepted Answer · 2014-05-27 08:26:32Z

4

You might be looking for array_column introduced in PHP 5.5 (however this still internally loops through the entire array to gather which sub arrays have this key):

<?php

$details = array_column($details, 'year');

print_r($details);

/*
    Array
    (
        [0] => 1990
        [1] => 1995
    )
*/

DEMO

For older versions of PHP the author himself has a polyfill on github.

edited May 27, 2014 at 8:26

answered May 27, 2014 at 8:21

h2ooooooo

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9 Comments

InventorX Over a year ago

What you think about PHP's Prevoius versions ?

h2ooooooo Over a year ago

@InventorX Huh? How far back? PHP 5.3+ is usually fine? What do you mean?

InventorX Over a year ago

Means PHP 5.3+ and less then PHP 5.5

Ivan Yonkov Over a year ago

array_column I guess is introduced before 5.5

devdarsh Over a year ago

Thanks for the solution h2ooooooo. many hosting providers are running php 5.2.x and so I think to use ramsey's alternate solution as you mentioned. Thanks again

|

InventorX · Accepted Answer · 2014-05-27 09:04:53Z

0

PHP Array

$details = array(
    array('year' => '1990'),
    array('year' => '1995'),
    array('condition' => 'working'),
    array('type' => 'bus'),
    array('type' => 'car'),
    array('type' => 'bike'),
);

Create Array that contain only "Type" index

$names = array_map(function ($v)
        { 
            return $v['type']; 
        }, 
        $details);

$names = array_filter($names);      

print_r($names);

Output

Array ( [3] => bus [4] => car [5] => bike )

answered May 27, 2014 at 9:04

InventorX

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1 Comment

Raggamuffin Over a year ago

use array_values() to reset the keys, and pretty nice solution really.

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