delete subarrays from multiple array by equal values of key PHP - php

Question

i faced with problem and i hope that you can help
I have array like this (but with hundreds of subarrays):
Array
(
[0] => Array
(
[id] => 211
[name] => Name
[description] => Desc
[Link] => http://link/211
[previewUrl] => https://link/id885364?mt=8
[payout] => 0.30
[image] => http://link/ios.png
[categories] => Array
(
[0] => iOS
[1] => Games
)
)
[1] => Array
(
[id] => 2
[name] => Name
[description] => Desc
[Link] => http://link/211
[previewUrl] => https://link/id885364?mt=8
[payout] => 2
[image] => http://link/ios.png
[categories] => Array
(
[0] => iOS
[1] => Games
)
)
)
I need to find all subarrays that equals by 'previewUrl' and then find among them one with max value of 'payout' and delete others with smaller value.
Thank you!

Answer 1

Loop through the original array ($arr) collecting the maximum payout values in a temporary array ($max_arr). When a higher payout is found replace the previous higher payout in the temporary array and delete it in the original array. When a lower or equal payout is found delete it.
<?php
$arr = array(array('id' => 211, 'name' => 'Name', 'description' => 'Desc', 'Link' => 'http://link/211', 'previewUrl' => 'https://link/id885364?mt=8', 'payout' => '0.30', 'image' => 'http://link/ios.png', 'categories' => array('0' => 'iOS', '1' => 'Games')), array('id' => 2, 'name' => 'Name', 'description' => 'Desc', 'Link' => 'http://link/211', 'previewUrl' => 'https://link/id885364?mt=8', 'payout' => '2', 'image' => 'http://link/ios.png', 'categories' => array('0' => 'iOS', '1' => 'Games')), array('id' => 11, 'name' => 'Name', 'description' => 'Desc', 'Link' => 'http://link/211', 'previewUrl' => 'https://link/id885364?mt=7', 'payout' => '3', 'image' => 'http://link/ios.png', 'categories' => array('0' => 'iOS', '1' => 'Games')), array('id' => 1, 'name' => 'Name', 'description' => 'Desc', 'Link' => 'http://link/211', 'previewUrl' => 'https://link/id885364?mt=7', 'payout' => '1', 'image' => 'http://link/ios.png', 'categories' => array('0' => 'iOS', '1' => 'Games')));
$max_arr = array(); // temporary array
foreach ( $arr as $key => $value ) {
if ( !isset($max_arr[$value['previewUrl']]) ) {
$max_arr[$value['previewUrl']] = array_merge(array('key' => $key), $value);
}
else {
// higher payout
if ( $max_arr[$value['previewUrl']]['payout'] < $value['payout'] ) {
unset($arr[$max_arr[$value['previewUrl']]['key']]);
$max_arr[$value['previewUrl']] = array_merge(array('key' => $key), $value);
}
else { unset($arr[$key]); } // lower or equal payout
}
}
?>

Answer 2

You can try with the following:
class MyArrayParser{
var $preview_url;
var $max_payout;
function filter_preview_url($subarray)
{
return $subarray["previewUrl"] == $this->preview_url;
}
function filter_payout($subarray)
{
return $subarray["payout"] == $this->max_payout;
}
function search_max_payout_by_previewUrl($big_array,$preview_url)
{
$this->preview_url = $preview_url;
$filtered_array = array_filter($big_array,array($this,"filter_preview_url")); //Only subarrays with previewUrl == $preview_url
function payout_extract($subarray)
{
return $subarray["payout"];
}
$payouts_list = array_map("payout_extract",$filtered_array);
if(count($payouts_list)==0) //PreviewUrl not found
return array();
$this->max_payout = max($payouts_list);
$only_max_payout_list = array_filter($filtered_array,array($this,"filter_payout"));
return $only_max_payout_list;
}
}
$obj = new MyArrayParser();
$filtered_array = $obj->search_max_payout_by_previewUrl($my_big_array,"....previewUrl...."));

Answer 3

Not necessarily fast, but it's pretty easy to understand.
$a = array(
array ('id' => 211,'previewUrl' => 'https://link/id885364?mt=8','payout' => 0.30),
array ('id' => 2,'previewUrl' => 'https://link/id885364?mt=8','payout' => 2));
$searchUrl = 'https://link/id885364?mt=8';
$to_delete = array();
$max_payout = -1;
$max_key = "";
// Loop through array, looking at previewUrls that match.
foreach ($a as $key => $subarray) {
if ($subarray['previewUrl'] == $searchUrl) {
// Save all matches to an array for deletion.
array_push($to_delete, $key);
// Find the element with the highest payout.
if ($subarray['payout'] > $max_payout || $max_payout == -1) {
$max_payout = $subarray['payout'];
$max_key = $key;
}
}
}
// Remove the element with the highest payout.
if (($key = array_search($max_key, $to_delete)) !== false) {
unset($to_delete[$key]);
}
//print $max_payout;
//print $max_key;
//print_r($to_delete);
// Finally, delete all the elements flagged for deletion.
foreach ($to_delete as $key) {
unset($a[$key]);
}
print_r($a);