link a value from an array to another in PHP - php

Question

I'm trying two combine two arrays based on the values names.
Here what I'm trying to do :
$array1 = ("fifa21","pes21","halflife2","carma2");
$array2 = ("fifa21_cover","pes21_cover","halflife2_cover");
I want to loop through both arrays and if value from array1 match value from array 2 it will list both values like this :
fifa21 - fifa21_cover
pes21 - pes21_cover
halflife2 - halflife2_cover
carma2 - default_cover
if not find anything in the array2, a default cover will be used.
Note: the arrays will be filled dynamically based in a scanDir (two different folders search) and the arrays can be sorted differently than shown in the example above.

Answer 1

This code will loop through array1 and check to see if the item cover exists in array2, if it does then it will echo out in the format you wanted.
$array1 = array("fifa21","pes21","halflife2","carma2");
$array2 = array("fifa21_cover","pes21_cover","halflife2_cover");
foreach ($array1 as $item) {
if (in_array($item."_cover", $array2)) {
echo "<p>".$item." - ".$item."_cover</p>\n";
} else {
// use default cover...
}
}

Answer 2

(because it is lunch time and I need to write some code)
Given two arrays:
$array1 = ["fifa21", "pes21", "halflife2", "carma2"];
$array2 = ["fifa21_cover", "pes21_cover", "halflife2_cover"];
A function such as this can walk through and look for items that start with those values:
function merge_arrays(array $array1, array $array2): array
{
$output = [];
array_walk(
$array1,
static function ($key) use ($array2, &$output) {
$items = array_filter($array2, static fn($f) => 0 === mb_strpos($f, $key));
if (count($items) === 1) {
$output[$key] = reset($items);
return;
}
if (count($items) === 0) {
$output[$key] = 'default_cover';
return;
}
throw new RuntimeException('More than one item found starting with key ' . $key);
}
);
return $output;
}
When called as:
print_r(merge_arrays($array1, $array2));
It will output:
(
[fifa21] => fifa21_cover
[pes21] => pes21_cover
[halflife2] => halflife2_cover
[carma2] => default_cover
)
For your use-case, it might be overly complicated when compared to a for loop, but it does the job.
Another version that more-blindly assumes only a one-to-one match could use the ?? operator for a null check, although I wouldn't recommend this. The more terse and compact that code looks, the more I find that it is usually very hard to reason about, especially in the future:
function merge_arrays(array $array1, array $array2): array
{
$output = [];
array_walk(
$array1,
static function ($key) use ($array2, &$output) {
$output[$key] = array_filter($array2, static fn($f) => 0 === mb_strpos($f, $key))[0] ?? 'default_cover';
}
);
return $output;
}

Answer 3

All code snipping provided works, however if the array values have extension it always assumes the default cover. I can figure it how using my code by removing the extension for compare purpose, and then I add it back.
Inside my loop I use this :
$keyvaluetemp = substr($keyvalue, 0, strrpos($keyvalue, "."));
the above it inside my first ForEach (where I check the first array), and then in the covers array I remove the "_cover" by nothing :
$keyvalue2temp = (str_replace("_cover", "",$keyvalue2));
then I use the following code inside the second ForEach to add the data to a DB:
// if fantart match the game file name so we associate it to the game and save to the DB
if ( stripos ( $keyvalue2temp , $keyvaluetemp ) !== FALSE )
{
$sql = "UPDATE listgames SET FanArt='$keyvalue2' WHERE Name='$keyvalue'";
$con->exec($sql);
}
// if fanart is empty we add a default picture
$checkifempty = "SELECT `FanArt` FROM `listgames` WHERE `Name` = '$keyvalue'";
$runsql = $con->query($checkifempty);
$row = $runsql->fetch(PDO::FETCH_ASSOC);
$fanartkey = $row['FanArt'];
if($fanartkey == '')
{
$sql = "UPDATE listgames SET FanArt='nopic.JPG' WHERE Name='$keyvalue'";
$con->exec($sql);
}
Later in my code I print the results from the DB. I don't know if this is the best approach, however it does exactly what I want :)