Recursive — PHP Technical Interview Questions & Answers

Recursive

Recursive

  • Recursive (function) is a PHP topic. In plain words you use it for function add($a, $b) in a marks helper. Don’t start with a slogan — start with that picture.
  • Smallest example: function name($x) { return $x; }. Type it, run it, and say what you see. If you can do that from memory, you know Recursive (function).
  • From the example next to this theory: Recursive: scores array, print avg, then high marks.
  • Trap: no return so the caller gets null. Fix that before you talk about advanced PHP.
  • Viva: what is Recursive (function)? Then show function name($x) { return $x; }. Then name the trap.

Technical Interview Tip: What is Recursive (function)? Show this: function name($x) { return $x; }. Trap: no return so the caller gets null.

Code Examples for Recursive

Recursive — working example

<?php
// Recursive
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

Recursive: scores array, print avg, then high marks. Say the output.

How to Explain Recursive to an Interviewer

What is Recursive (function)?

Used for function add($a, $b) a marks helper Not just the heading

Give one small example of Recursive (function).

function name($x) { return $x; } Recursive: scores array, print avg, then high marks

What mistake do beginners make with Recursive (function)?

no return so the caller gets null Show the fix

Where do you use Recursive (function)?

a marks helper function add($a, $b)