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@ 2020-04-13T13:05:16Z

<?php

$array = array(
    "FL_1" => array(
        "MIC_1" => array(
            "SP_4" => 7
        ),
        "MIC_13" => array(
            "SP_16" => 4
        ),
        "MIC_6" => array(
            "SP_74" => 4
        )
    ),
    "FL_2" => array(
        "MIC_1" => array(
            "SP_5" => 4
        ),
        "MIC_13" => array(
            "SP_17" => 4
        ),
        "MIC_6" => array(
            "SP_75" => 4
        )
    ),
    "FL_3" => array(
        "MIC_1" => array(
            "SP_5" => 89
        ),
        "MIC_13" => array(
            "SP_18" => 1
        ),
        "MIC_6" => array(
            "SP_78" => 21
        )
    )
);

// find the minimum SP_X value and its key
$min_sp = PHP_INT_MAX;
$min_key = '';
array_walk_recursive($array, function ($v, $k) use (&$min_sp, &$min_key) {
    if ($v < $min_sp) {
        $min_sp = $v;
        $min_key = $k;
    } 
});
echo "$min_key => $min_sp\n";

// find the MIC_X key corresponding to the min SP_X value
$mic_key = '';
foreach ($array as $fl) {
    foreach ($fl as $mic => $sp) {
        if (isset($sp[$min_key]) && $sp[$min_key] == $min_sp) {
            $mic_key = $mic;
            break 2;
        }
    }
}
echo "$mic_key\n";

// filter the array to get all the MIC_X values
$out = array_map(function ($fl) use ($mic_key) {
    return array_filter($fl, function ($mic) use ($mic_key) {
        return $mic == $mic_key;
    }, ARRAY_FILTER_USE_KEY);
}, $array);

print_r($out);

Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: SP_18 => 1 MIC_13 Array ( [FL_1] => Array ( [MIC_13] => Array ( [SP_16] => 4 ) ) [FL_2] => Array ( [MIC_13] => Array ( [SP_17] => 4 ) ) [FL_3] => Array ( [MIC_13] => Array ( [SP_18] => 1 ) ) )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 SP_18 => 1 MIC_13 Array ( [FL_1] => Array ( [MIC_13] => Array ( [SP_16] => 4 ) ) [FL_2] => Array ( [MIC_13] => Array ( [SP_17] => 4 ) ) [FL_3] => Array ( [MIC_13] => Array ( [SP_18] => 1 ) ) )

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