What are the advantages of using array keys in a foreach loop to remove array elements in PHP instead of using unset()?

When using unset() within a foreach loop to remove elements from an array in PHP, it can lead to unexpected results or errors due to the array being modified during iteration. To avoid this issue, it is recommended to use array keys in the foreach loop to safely remove elements without disrupting the iteration. 

// Example of using array keys in a foreach loop to remove elements safely
$array = ['a', 'b', 'c', 'd'];

foreach(array_keys($array) as $key) {
    if ($array[$key] == 'b') {
        unset($array[$key]);
    }
}

print_r($array);

Keywords

array keys foreach loop remove array elements unset() advantages

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