Deleting from a multi dimensional array

Question

I need to delete from a multi dimensional array.

My array looks as follows

Array(
   0 => Array(
      0 => "My Album",
      1 => "Testphoto2011-222231.jpg"
   ),
   1 => Array(
      0 => "Test Album",
      1 => "12345.jpg"
   )
);

What I want to do is search the value "My Album" and then delete the entire array from the array.

So for example the values "My Album" & "Testphoto2011-222231.jpg" belong to array[0]. When found I want to delete array[0].

Can anyone help me on this?

Lightness Races in Orbit · Accepted Answer · 2011-07-24 20:02:25Z

1

<?php
$ar = Array(
   Array(
      "My Album",
      "Testphoto2011-222231.jpg"
   ),
   Array(
      "Test Album",
      "12345.jpg"
   )
);

// Not using foreach, or ascending counting, because
// element removal will screw that up.
for ($i = count($ar) - 1; $i >= 0; $i--) {
   if ($ar[$i][0] == "My Album")
      unset($ar[$i]);
}

$ar = array_values($ar); // re-index

var_export($ar);

/* Output:
array (
  0 => 
  array (
    0 => 'Test Album',
    1 => '12345.jpg',
  ),
)
*/
?>

Live demo.

answered Jul 24, 2011 at 20:02

Lightness Races in Orbit

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2 Comments

Wayne Over a year ago

Brilliant thanks, i just have one question, My array is in a session, I used this code for ($i = count($_SESSION['albums']) - 1; $i >= 0; $i--) { if ($_SESSION['albums'][$i][0] == $album) unset($_SESSION['albums'][$i]); } $_SESSION['albums'] = array_values($_SESSION['albums']); // re-index var_export($_SESSION['albums']); is this right? At the moment its not updating the session array

Lightness Races in Orbit Over a year ago

@Wayne: Please use backticks to format code. And yes, that looks right.

Mike · Accepted Answer · 2011-07-24 20:00:53Z

0

unset($array[0]) will remove that entry from the array.

answered Jul 24, 2011 at 20:00

Mike

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