Question

How do you loop through a multidimensional array in PHP?

• A. Using nested foreach or for loops
• B. Using a single foreach loop
• C. Using a for loop only
• D. Using the while loop only

Hint:

Each extra array dimension needs one more loop wrapped inside the previous one.

Answer 1

The Correct Option is A

Idea: Count how many index levels the data has.

A 2D PHP array needs two index accesses, say $arr[i][j]$. Each independent index needs its own loop, so a depth of 2 needs 2 nested loops.

A single loop gives only $arr[i]$, which is still an array, not a scalar. The claim that only for or only while works is false, because foreach, for and while can all nest.

General rule for depth $d$:
\[ \text{loops needed} = d \]
For a multidimensional array this means nested loops.
\[\boxed{\text{Option A: nested foreach or for loops}}\]