How do I reindex an array after using unset()?

Question

I'm having a little trouble with losing my array order after using unset(). This is the code I am using.

$id = $_GET['id'];
for ($i = 0; $i < count($my_array); $i++) {
  if ($my_array[$i] == $id) {
    unset($my_array[$i]);
  }
}

Assume that $my_array has 4 items and $my_array[1] is equal to $id. After I unset that, I loop on $my_array and I get an Undefined Offset: 1 error. With print_r($my_array), I get $my_array[0], $my_array[2], and $my_array[3].

I understand perfectly why that's happening. Is there a way to re-index the array so that item 2 'drops' to item 1, and and the rest of the items respectively to the end of the array?

Something like reindex($my_array) would be sweet. I know I could run another for loop with a new array and transfer them manually, but a one step solution would be awesome. I just couldn't find anything anywhere.

Artefacto · Accepted Answer · 2010-08-01 06:05:53Z

3

Call array_values to reindex the array.

answered Aug 1, 2010 at 6:05

Artefacto

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4 Comments

Adam Tootle Over a year ago

dude you rock. Though I had tried that already. We'll just blame this one on it being after 2 am ;) Thanks again

Artefacto Over a year ago

@Adam Well, it's past 7 am here :p I guess I'll go sleep too.

Artefacto Over a year ago

@Adam By the way, after the unset, you could iterate the now-one-element-short array with foreach. If you're reindexing because you're going to iterate with that for loop, it's unnecessary; just use foreach or reset and next.

Adam Tootle Over a year ago

Yeah I knew I could put in another couple of steps and do it that way, but array_values seems to be doing exactly what I needed. And yeah, 7am sounds like a nice stopping point :P

imagiro · Accepted Answer · 2013-12-04 15:42:47Z

1

I just discovered you can also do a

 array_splice($ar, 0, 0);

That does the re-indexing inplace, so you don't end up with a copy of the original array.

answered Dec 4, 2013 at 15:42

imagiro

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