如何在PHP中减少数组的内部数组值？

Question

if I have the array like that:

array(
   array('id'=>123,'name'=>"Ele1"),
   array('id'=>12233,'name'=>"Ele2"),
   array('id'=>1003,'name'=>"Ele4"),
   array('id'=>1233,'name'=>"Ele5")
)

That's the data I get and I want to effeciently remove 2nd value of every inner array. (e.g. "Ele1", "Ele2". .... )

here is what I do:

$numEle = count($arrayA);
$_arrayB = array();
for ($i=0; $i<$numEle ; $i++)
{
 array_push($_arrayB ,  $arrayA[$i]['id']); 
}

Instead of have a for loop to read and assign the value to a new array. What is the best way to do it? any php build-in function I should use?

like array_map?

I currently do that:

---

Thanks all for the answer. They all work. :)

Answer 1

When you're using PHP 5.3 the solution can be quite elegant:

$b = array_map(function($item) { return $item['id']; }, $arrayA);

On PHP < 5.3 you would have to create a callback function

function mapCallback($item) {
    return $item['id'];
}
$b = array_map('mapCallback', $arrayA);

or use create_function() to create a dynamic callback function (I won't show this, because it actually hurts my eyes ;-))