What are some best practices for manipulating arrays in PHP within a foreach loop?

When manipulating arrays within a foreach loop in PHP, it's important to avoid directly modifying the array being iterated over as it can lead to unexpected results. Instead, create a new array to store the modified values. This ensures that the original array remains intact and the loop operates as expected. 

$originalArray = [1, 2, 3, 4, 5];
$newArray = [];

foreach ($originalArray as $value) {
    // Manipulate the value
    $newValue = $value * 2;
    
    // Store the modified value in a new array
    $newArray[] = $newValue;
}

// $originalArray remains unchanged
print_r($originalArray);
// $newArray contains the modified values
print_r($newArray);

Keywords

foreach loop array manipulation PHP array functions iteration

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