checkdate() — PHP Technical Interview Questions & Answers

checkdate()

checkdate()

  • checkdate() (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 $x; }. Type it, run it, and say what you see. If you can do that from memory, you know checkdate() (function).
  • From the example next to this theory: checkdate(): scores array, print avg, then high marks.
  • Trap: no return so the caller gets null. Fix that before you talk about advanced PHP.
  • Viva: what is checkdate() (function)? Then show function name($x) { return $x; }. Then name the trap.

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

Code Examples for checkdate()

checkdate() — working example

<?php
// checkdate()
$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";
}

checkdate(): scores array, print avg, then high marks. Say the output.

How to Explain checkdate() to an Interviewer

What is checkdate() (function)?

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

Give one small example of checkdate() (function).

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

What mistake do beginners make with checkdate() (function)?

no return so the caller gets null Show the fix

Where do you use checkdate() (function)?

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