Reputation: 3715
I am writing a script to compare the achievements of one player to another in a game. In each of the arrays the id and timestamp will match up on some entries. I have included a sample of one of the start of the 2 separate arrays:
Array
(
[0] => Array
(
[id] => 8213
[timestamp] => 1384420404000
[url] => http://www.wowhead.com/achievement=8213&who=Azramon&when=1384420404000
[name] => Friends In Places Higher Yet
)
[1] => Array
(
[id] => 6460
[timestamp] => 1384156380000
[url] => http://www.wowhead.com/achievement=6460&who=Azramon&when=1384156380000
[name] => Hydrophobia
)
I want to find all of the array items where the id and timestamp match. I have looked into array_intersect but I don't think this is what I am looking for as it will only find items when the entries are identical. Any help much appreciated.
Upvotes: 2
Views: 634
Reputation: 3470
If you want to go on an exploration of array callback functions, take a look at array_uintersect. It's like array_intersect except you specify a function to use for the comparison. This means you can write your own.
Unfortunately, you need to implement a function that returns -1, 0 or 1 based on less than, same as, greater than, so you need more code. But I suspect that it'll be the most efficient way of doing what you're looking for.
function compareArrays( $compareArray1, $compareArray2 ) {
if ( $compareArray1['id'] == $compareArray2['id'] && $compareArray1['timestamp'] == $compareArray2['timestamp'] ) {
return 0;
}
if ( $compareArray1['id'] < $compareArray2['id'] ) {
return -1;
}
if ( $compareArray1['id'] > $compareArray2['id'] ) {
return 1;
}
if ( $compareArray1['timestamp'] < $compareArray2['timestamp'] ) {
return -1;
}
if ( $compareArray1['timestamp'] > $compareArray2['timestamp'] ) {
return 1;
}
}
var_dump( array_uintersect( $array1, $array2, "compareArrays") );
Upvotes: 0
Reputation: 4104
Try something like this:
<?php
$key_match = Array();
//Loop first array
foreach($array as $key => $element){
//Compare to second array
if($element == $array2[$key]){
//Store matching keys
$key_match[] = $key;
}
}
?>
$key_match will be an array with all matching keys.
(I'm at work and havn't had time to test the code)
Hope it helps
EDIT: Fully working example below:
<?php
$a1["t"] = "123";
$a1["b"] = "124";
$a1["3"] = "125";
$a2["t"] = "123";
$a2["b"] = "124";
$a2["3"] = "115";
$key_match = Array();
//Loop first array
foreach($a1 as $key => $element){
//Compare to second array
if($element == $a2[$key]){
//Store matching keys
$key_match[] = $key;
}
}
var_dump($key_match);
?>
Upvotes: 0