What are some common pitfalls to avoid when creating and manipulating two-dimensional arrays in PHP?

One common pitfall to avoid when creating and manipulating two-dimensional arrays in PHP is not properly initializing the inner arrays. If the inner arrays are not initialized, you may encounter unexpected behavior when trying to access or modify elements within them. To avoid this issue, make sure to initialize each inner array before adding elements to it.

// Incorrect way: Not initializing inner arrays
$twoDArray = [];
$twoDArray[0][0] = 1; // This will throw an error

// Correct way: Initialize inner arrays before adding elements
$twoDArray = [];
$twoDArray[0] = [];
$twoDArray[0][0] = 1; // This will work correctly