What are some common mistakes to avoid when using foreach loops in PHP?

One common mistake to avoid when using foreach loops in PHP is modifying the array being iterated over within the loop. This can lead to unexpected behavior and errors. To avoid this, make a copy of the array before iterating over it. 

// Incorrect way - modifying the array within the loop
$array = [1, 2, 3, 4, 5];
foreach ($array as $value) {
    if ($value % 2 == 0) {
        unset($array[array_search($value, $array)]);
    }
}

// Correct way - making a copy of the array before iterating
$array = [1, 2, 3, 4, 5];
$arrayCopy = $array;
foreach ($arrayCopy as $value) {
    if ($value % 2 == 0) {
        unset($array[array_search($value, $array)]);
    }
}

Keywords

foreach loop PHP array iteration error handling

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