Removing duplicate data in a multi dimension array (associative array) - php

Question

I have three keys pointing to value of type array, in those array values I have duplicate values. How can I remove them?
array(3) {
["rock"]=>
array(4) {
[0]=>
array(9) {
["id"]=>
string(1) "1"
["title"]=>
string(15) "Teleman Tickets"
["location"]=>
string(20) "Concorde 2, Brighton"
["event_date"]=>
string(10) "2017-02-20"
["event_time"]=>
string(8) "20:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "50.817321799999990"
["geo_long"]=>
string(17) "-0.12304610000001"
["tags"]=>
string(30) "rock,alternative,indie"
}
[1]=>
array(9) {
["id"]=>
string(1) "4"
["title"]=>
string(9) "Blink-182"
["location"]=>
string(25) "Motorpoint Arena, Cardiff"
["event_date"]=>
string(10) "2017-07-03"
["event_time"]=>
string(8) "18:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "51.478937400000010"
["geo_long"]=>
string(17) "-3.17172289999996"
["tags"]=>
string(14) "rock,metal"
}
[2]=>
array(9) {
["id"]=>
string(1) "8"
["title"]=>
string(5) "Ghost"
["location"]=>
string(29) "O2 Forum Kentish Town, London"
["event_date"]=>
string(10) "2017-03-26"
["event_time"]=>
string(8) "19:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "51.552197000000010"
["geo_long"]=>
string(17) "-0.14196900000002"
["tags"]=>
string(30) "rock,alternative,indie"
}
[3]=>
array(9) {
["id"]=>
string(2) "10"
["title"]=>
string(11) "Courteeners"
["location"]=>
string(39) "Emirates Old Trafford, Lancashire C.C.C"
["event_date"]=>
string(10) "2017-05-27"
["event_time"]=>
string(8) "16:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "53.456428000000000"
["geo_long"]=>
string(17) "-2.28679699999998"
["tags"]=>
string(30) "rock,alternative,indie"
}
}
["alternative"]=>
array(4) {
[0]=>
array(9) {
["id"]=>
string(1) "1"
["title"]=>
string(15) "Teleman Tickets"
["location"]=>
string(20) "Concorde 2, Brighton"
["event_date"]=>
string(10) "2017-02-20"
["event_time"]=>
string(8) "20:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "50.817321799999990"
["geo_long"]=>
string(17) "-0.12304610000001"
["tags"]=>
string(30) "rock,alternative,indie"
}
[1]=>
array(9) {
["id"]=>
string(1) "6"
["title"]=>
string(6) "Sum 41"
["location"]=>
string(23) "O2 Academy Leeds, Leeds"
["event_date"]=>
string(10) "2017-02-26"
["event_time"]=>
string(8) "19:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "53.802188400000000"
["geo_long"]=>
string(17) "-1.54713770000001"
["tags"]=>
string(21) "alternative,indie"
}
[2]=>
array(9) {
["id"]=>
string(1) "8"
["title"]=>
string(5) "Ghost"
["location"]=>
string(29) "O2 Forum Kentish Town, London"
["event_date"]=>
string(10) "2017-03-26"
["event_time"]=>
string(8) "19:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "51.552197000000010"
["geo_long"]=>
string(17) "-0.14196900000002"
["tags"]=>
string(30) "rock,alternative,indie"
}
[3]=>
array(9) {
["id"]=>
string(2) "10"
["title"]=>
string(11) "Courteeners"
["location"]=>
string(39) "Emirates Old Trafford, Lancashire C.C.C"
["event_date"]=>
string(10) "2017-05-27"
["event_time"]=>
string(8) "16:00:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "53.456428000000000"
["geo_long"]=>
string(17) "-2.28679699999998"
["tags"]=>
string(30) "rock,alternative,indie"
}
}
["sax"]=>
array(1) {
[0]=>
array(9) {
["id"]=>
string(1) "3"
["title"]=>
string(9) "Take That"
["location"]=>
string(22) "The SSE Hydro, Glasgow"
["event_date"]=>
string(10) "2017-05-11"
["event_time"]=>
string(8) "18:30:00"
["url"]=>
string(1) "0"
["geo_lat"]=>
string(18) "55.860156000000000"
["geo_long"]=>
string(17) "-4.28525800000000"
["tags"]=>
string(24) "pop,boy-band,sax"
}
}
}

Answer 1

I'm going to assume that if two bands have the same 'id' then they are identical
$unique_bands = array();
// if the master array is called bands
foreach($bands as $genre){
foreach($genre as $band){
$unqiue_bands[$band['id']] = $band;
}
}
Maybe put $unique_bands = array_values(array_filter($unique_bands)); at the end to reindex the array

Answer 2

You have a solution on the official documentation... A person made a simple function to do exactly what you want.
Example array:
<?php
$details = array(
0 => array("id"=>"1", "name"=>"Mike", "num"=>"9876543210"),
1 => array("id"=>"2", "name"=>"Carissa", "num"=>"08548596258"),
2 => array("id"=>"1", "name"=>"Mathew", "num"=>"784581254"),
);
?>
Function:
<?php
function unique_multidim_array($array, $key) {
$temp_array = array();
$i = 0;
$key_array = array();
foreach($array as $val) {
if (!in_array($val[$key], $key_array)) {
$key_array[$i] = $val[$key];
$temp_array[$i] = $val;
}
$i++;
}
return $temp_array;
}
?>
You will have to fix it to work your for array dimension.