implode first element in associative array

Question

I have one index array which contain associative array. Like this

$arr = array(
            array("id" => 1,"name" => "student1"),
            array("id" => 2,"name" => "student2"),
            array("id" => 3,"name" => "student3"),
        );

Now I want output like this

1,2,3 // output

I have solution for it but I am searching for better way to do that. Here it is

$ids = "";
for($i=0;$i<count($arr);$i++)
{
    $ids .= $arr[$i]['id'].",";
}

$ids = rtrim($ids,",");
echo $ids; // output : 1,2,3

Is there any better way to achieve it?

Thanks in advance

score 3 · Answer 1 · answered Jan 21 '14 at 11:14

3

If you have php version >= 5.5 then try,

echo implode(",",array_column($arr,'id'));

answered Jan 21 '14 at 11:14

Nouphal.M

6,304
1
17
28

Didn't you forget the `glue` parameter ? – Shankar Narayana Damodaran Jan 21 '14 at 11:17
Thanks Nouphal.M but I have php version 5.4.16 – user2923768 Jan 21 '14 at 11:29

score 3 · Accepted Answer · answered Jan 21 '14 at 11:17

3

Alternative using array_map() if you don't have PHP 5.5+:

echo implode(',', array_map(function($v) { return $v['id']; }, $arr));

Demo

answered Jan 21 '14 at 11:17

billyonecan

20,090
8
42
64

score 0 · Answer 3 · answered Jan 21 '14 at 11:21

try this code

<?php

    $arr = array(
                array("id" => 1,"name" => "student1"),
                array("id" => 2,"name" => "student2"),
                array("id" => 3,"name" => "student3"),
            );
    $str = "";      
    foreach ($arr as $value)        
    {

        $str=$str.$value["id"].",";
    }
    $str = substr($str, 0, -1);
    echo $str;
    ?>

score 0 · Answer 4 · answered Jan 21 '14 at 11:25

0

foreach ($arr as $val){
$ids[]=$val['id'];
}
echo implode(($ids),',');

answered Jan 21 '14 at 11:25

sinisake

11,240
2
19
27

implode first element in associative array

4 Answers4

Demo