substr() — PHP Technical Interview Questions & Answers

substr()

substr()

  • substr() is a PHP topic. In plain words you use it for a short substr example in a college portal page. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest substr example you can type. Type it, run it, and say what you see. If you can do that from memory, you know substr().
  • From the example next to this theory: substr(): scores array, print avg, then high marks.
  • Trap: only saying “substr” with no example. Fix that before you talk about advanced PHP.
  • Viva: what is substr()? Then show the smallest substr example you can type. Then name the trap.

Technical Interview Tip: What is substr()? Show this: the smallest substr example you can type. Trap: only saying “substr” with no example.

Code Examples for substr()

substr() — working example

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

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

How to Explain substr() to an Interviewer

What is substr()?

Used for a short substr example a college portal page Not just the heading

Give one small example of substr().

the smallest substr example you can type substr(): scores array, print avg, then high marks

What mistake do beginners make with substr()?

only saying “substr” with no example Show the fix

Where do you use substr()?

a college portal page a short substr example