Delete/unset an array element matching a key/value of another array element [PHP]

by

Try this:

<?php
$messages = array(

  'message1'=>array(
    'type'=>'voice',
    'call-id'=>'11',
    'id'=>'message1'
  ),
  'message2'=>array(
    'type'=>'voice',
    'call-id'=>'44',
    'id'=>'message2'
  ),
  'message3'=>array(
    'type'=>'text',
    'call-id'=>'44',
    'id'=>'message3'
  ),
  'message4'=>array(
    'type'=>'text',
    'call-id'=>'55',
    'id'=>'message4'
  ),
  'message5'=>array(
    'type'=>'voice',
    'call-id'=>'55',
    'id'=>'message5'
  ),

);

$unique = [];

foreach ($messages as $value) {
    if ($value['type'] == 'text') {
        $unique[$value['call-id']] = $value;
    // so text comes first and override any previous value with the same call-id
    } else if (!array_key_exists($value['call-id'], $unique)) {
        $unique[$value['call-id']] = $value;
    // will be added only if no same call-id and will be overridden if same call-id with type text after
    }
}

foreach ($unique as $value) {
    $array[$value['id']] = $value;
}

echo '<pre>';
print_r($array);

OUTPUT:

    Array
(
    [message1] => Array
        (
            [type] => voice
            [call-id] => 11
            [id] => message1
        )

    [message3] => Array
        (
            [type] => text
            [call-id] => 44
            [id] => message3
        )

    [message4] => Array
        (
            [type] => text
            [call-id] => 55
            [id] => message4
        )

)

http://www.phpwin.org/s/LJxrQw

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