How can a multidimensional array in PHP be accessed and manipulated effectively?

Multidimensional arrays in PHP can be accessed and manipulated effectively by using nested loops to iterate over the array elements. This allows you to access specific elements within the multidimensional array and perform operations on them. Additionally, PHP array functions such as array_push(), array_pop(), array_shift(), and array_unshift() can be used to manipulate the multidimensional array easily.

// Example of accessing and manipulating a multidimensional array in PHP

$multiArray = array(
    array(1, 2, 3),
    array(4, 5, 6),
    array(7, 8, 9)
);

// Accessing elements in the multidimensional array
echo $multiArray[1][2]; // Output: 6

// Manipulating the multidimensional array
array_push($multiArray[0], 10);
print_r($multiArray[0]); // Output: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 10 )