How can PHP developers handle situations where certain arrays may have different structures (e.g., some with 'main' and 'subs' keys while others only have 'main') when sorting multidimensional arrays?

When dealing with multidimensional arrays that may have different structures, PHP developers can use conditional checks to handle the variations. By checking if certain keys exist before accessing them, developers can ensure that their code doesn't throw errors when sorting arrays with different structures. This can be achieved by using functions like isset() or array_key_exists() to verify the presence of specific keys before sorting the arrays.

// Sample multidimensional array with varying structures
$sampleArray = [
    ['main' => 'value1', 'subs' => ['sub1', 'sub2']],
    ['main' => 'value2'],
    ['main' => 'value3', 'subs' => ['sub3']],
];

// Sort the array based on the 'main' key
usort($sampleArray, function($a, $b) {
    if (isset($a['main']) && isset($b['main'])) {
        return $a['main'] <=> $b['main'];
    }
    return 0;
});

// Output the sorted array
print_r($sampleArray);