What are best practices for iterating over multidimensional arrays in PHP to prevent errors and improve code efficiency?

When iterating over multidimensional arrays in PHP, it is important to use nested loops to properly access and manipulate the data. This prevents errors such as trying to access non-existent keys or values. Additionally, using functions like `isset()` or `empty()` can help ensure that the array elements being accessed actually exist, improving code efficiency. 

// Example of iterating over a multidimensional array
$multiArray = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
];

foreach ($multiArray as $innerArray) {
    foreach ($innerArray as $value) {
        echo $value . " ";
    }
}

Keywords

multidimensional arrays iteration PHP errors efficiency

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