How can PHP developers efficiently debug code that involves copying variables from arrays?

When debugging code that involves copying variables from arrays in PHP, developers can efficiently use the `var_dump()` function to inspect the contents of the arrays and variables. This allows them to see the values being copied and identify any potential issues such as missing keys or unexpected data types. Additionally, using `isset()` or `array_key_exists()` functions can help ensure that the keys being copied actually exist in the arrays.

// Example code snippet for efficiently debugging code involving copying variables from arrays
$sourceArray = ['key1' => 'value1', 'key2' => 'value2'];
$destinationArray = [];

// Copying variables from sourceArray to destinationArray
foreach ($sourceArray as $key => $value) {
    if (isset($sourceArray[$key])) {
        $destinationArray[$key] = $value;
    } else {
        echo "Key $key does not exist in sourceArray";
    }
}

var_dump($destinationArray);