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?

Answer 1

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);