How Can I Modify Array Objects During a Non-Destructive Foreach Loop in PHP?

Non-Destructive Loop Iteration with Modified Object Values

When iterating through an array using a foreach loop, it may be desirable to modify the current object being handled within the loop. This can be achieved using two approaches.

Approach 1: Using Array Key Preserving

To preserve the key of the current object, use the following syntax:

foreach($questions as $key => $question){
    $questions[$key]['answers'] = $answers_model->get_answers_by_question_id($question['question_id']);
}

Here, the key ($key) is saved and used to update the corresponding value in the main $questions variable.

Approach 2: Using Reference Assignment

Alternatively, adding the & to the foreach loop value will update the $questions variable directly:

foreach($questions as &$question){

This approach modifies the value by reference, keeping the $questions array updated. However, the first approach is generally recommended.

PHP Documentation Note:

According to the PHP foreach documentation:

"In order to be able to directly modify array elements within the loop precede $value with &. In that case the value will be assigned by reference."

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