Using array_keys to search a multidimensional array with a partial array - php

Question

$testArray = array(
array(1,2,"file1.png"),
array(1,3,"file2.png"),
array(1,4,"file3.png")
);
print_r (array_keys($testArray, array(1,3, "file2.png"))); // Works
print_r (array_keys($testArray, array(1,3))); // Does not work.
As shown in the code above, I'd like to be able to quickly find an array in a multidimensional array but only specify two of the values.

Answer 1

One way to do this is to filter the testArray down to those number of keys using array_map, then use array_search to get the key.
$testArray = array(
array(1,2,"file1.png"),
array(1,3,"file2.png"),
array(1,4,"file3.png")
);
$search = [1,3];
$filtered = array_map(function ($item) use ($search){
return array_slice($item, 0, count($search));
}, $testArray);
$key = array_search($search, $filtered);
if ($key !== false){
print_r($testArray[$key]);
} else {
echo 'not found';
}

Answer 2

You can filter the array by testing which ones contain the values by computing the intersection and then get those keys:
$keys = array_keys(array_filter($testArray,
function($v) {
return count(array_intersect([1,3], $v)) == 2;
}));
You can extend it with a search $s variable:
$s = [1,3];
$keys = array_keys(array_filter($testArray,
function($v) use($s) {
return count(array_intersect($s, $v)) == count($s);
}));
This will return the keys for any sub array that contains [1,3], [3,1] or even [3,"file2.png",1], order is irrelevant.
To check them in order:
$s = [1,3];
$keys = array_keys(array_filter($testArray,
function($v) use($s) {
return count(array_intersect_assoc($s, $v)) == count($s);
}));

Answer 3

Loop through your data and slice each triplet, taking the first two items, and compare these to your needle. Return the file given a match.
<?php
$data = array(
array(1, 2, "file1.png"),
array(1, 3, "file2.png"),
array(1, 4, "file3.png")
);
$get_file_from_coords = function(array $coords) use ($data) {
foreach($data as $v) {
if (array_slice($v, 0, 2) == $coords) {
return $v[2];
}
}
};
echo $get_file_from_coords([1, 3]);
Output:
file2.png
(Note: If you have more than one file associated with your co-ordinate pair you'll need to adapt the code to return an array of matches.)
You don't necessarily need to slice or do anything fancy here. You can just compare like so:
[$v[0], $v[1]] == $coords

Answer 4

Your array data
$testArray = [
[1, 2, 'file1.png'],
[1 ,3, 'file2.png'],
[1 ,4, 'file3.png']
];
Specify what your search match conditions into an array
$matching = [1, 3];
Loop through your array data to find matches using array_intersect_assoc() which compares values and keys between two arrays. Store the actual found key and its values into a new array.
foreach ($testArray as $index => $contents) {
if (array_intersect_assoc($matching, $contents) == $matching) {
$found[$index] = $contents;
}
}
Display the results
echo '<pre>';
!empty($found) ? print_r($found) : print_r('not found');