How to use implode a column from an array of stdClass objects? [duplicate]

Question

I have an array of stdClass objects and I want to build a comma separated list using one specific field of all those stdClass objects. My array looks like this:

$obj1 = stdClass Object ( [foo] => 4 [bar] => 8 [foo-bar] => 15 );
$obj2 = stdClass Object ( [foo] => 16 [bar] => 23 [foo-bar] => 42 );
$obj3 = stdClass Object ( [foo] => 76 [bar] => 79 [foo-bar] => 83 );

$a = array(1=>$obj1 , 2=>$obj2 , 3=>$obj3);

And I want to implode on foo of all the stdClass objects in that array to create a comma separated list. So the desired result is:

4,16,76

Is there any way to do this with implode (or some other mystery function) without having to put this array of objects through a loop?

maybe if you overload the toString() method of the object.

clentfort
– clentfort

2012-05-31 12:52:21 +00:00
Commented May 31, 2012 at 12:52 — clentfort
– clentfort, Commented May 31, 2012 at 12:52

alex · Accepted Answer · 2012-05-31 12:54:09Z

41

You could use array_map() and implode()...

$a = array_map(function($obj) { return $obj->foo; }, 
               array(1=>$obj1 , 2=>$obj2 , 3=>$obj3));

$a = implode(", ", $a);

answered May 31, 2012 at 12:54

alex

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1 Comment

ubiquibacon Over a year ago

This works and is cleaner than a loop, unfortunately I am finding that a foreach loop performs better. I'm getting similar results with array_reduce :( Guess I'll just stick with the foreach loop.

Don't Panic · Accepted Answer · 2019-05-29 00:03:37Z

14

With PHP 7.0+ you can use array_column for this.

echo implode(',', array_column($a, 'foo'));

answered May 29, 2019 at 0:03

Don't Panic

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2 Comments

JochenJung Over a year ago

Works only, if foo is declared public.

Don't Panic Over a year ago

@JochenJung Can you have non-public properties in a StdClass object?

Kristofer Doman · Accepted Answer · 2020-09-17 17:34:33Z

11

This is actually the best way I've found, it doesn't seem to be answered here properly as the array of objects should be able to handle dynamic size.

$str = implode(',', array_map(function($x) { return $x->foo; }, $a));

edited Sep 17, 2020 at 17:34

answered Mar 31, 2016 at 15:47

Kristofer Doman

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Comments

VVV · Accepted Answer · 2014-09-25 12:41:39Z

7

You can actually set __toString() on the class as suggested by Ray, but you don't need to iterate through the array first. implode() will directly call the __toString() function of the objects (which also works with associative arrays, btw).

edited Sep 25, 2014 at 12:41

VVV

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answered Sep 25, 2014 at 12:35

osteel

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Niko · Accepted Answer · 2012-05-31 12:58:35Z

6

A very neat solution for this is the array_reduce() function, that reduces an array to a single value:

$str = array_reduce($a, function($v, $w) {
    if ($v) $v .= ',';
    return $v . $w->foo;
});

answered May 31, 2012 at 12:58

Niko

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alex · Accepted Answer · 2015-05-26 13:31:49Z

1

echo implode("','",(array)$data->stdArray);

edited May 26, 2015 at 13:31

alex

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answered Jan 26, 2015 at 18:28

Jason

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Comments

shadyyx · Accepted Answer · 2012-05-31 12:54:34Z

0

I guess the easiest way would be to create an ID indexed array and then call implode on array_keys:

$a = array();
$a[4] = stdClass Object ( [foo] => 4 [bar] => 8 [foo-bar] => 15 );
$a[16] = stdClass Object ( [foo] => 16 [bar] => 23 [foo-bar] => 42 );
$a[76] = stdClass Object ( [foo] => 76 [bar] => 79 [foo-bar] => 83 );

echo implode(', ', array_keys($a));

answered May 31, 2012 at 12:54

shadyyx

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Ray · Accepted Answer · 2012-05-31 12:54:51Z

0

No, the best you can do is iterate through, call tostring() on the object and put the results in a new array to call implode on.

answered May 31, 2012 at 12:54

Ray

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user3038781 · Accepted Answer · 2014-08-08 15:41:14Z

0

If it's a 1-level object, this worked for me.

function implodeObjValues($glue, $obj) { 
    $s = "";
    foreach($obj[1] as $n=>$v) {
        $s .= $glue . $v;
    }
    return substr($s,strlen($glue));
}

function implodeObjLabels($glue, $obj) { 
    $s = "";
    foreach($obj[1] as $n=>$v) {
        $s .= $glue . $n;
    }
    return substr($s,strlen($glue));
}

Could include a by-type multi-level process, but I didn't need that yet. Hope this helps.

Handy for converting MySQL object back to array.

$db = new mysqli("localhost",$usr,$pw,$db);
$row = $db->query("SHOW TABLES");
$a = implodeObjValues("|",$row);

answered Aug 8, 2014 at 15:41

user3038781

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