PHP · Theory

substr()

Theory

266/352

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.

Exam tip

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

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.

Short notes

Defsubstr() — a short substr example in a college portal page.
Rulethe smallest substr example you can type
Traponly saying “substr” with no example
Usea college portal page

PHP · Theory

substr()

← All stacks

Theory

266/352

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.

Exam tip

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

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.

Short notes

Defsubstr() — a short substr example in a college portal page.
Rulethe smallest substr example you can type
Traponly saying “substr” with no example
Usea college portal page

substr()

Example

Short notes

Questions

substr()

Example

Short notes

Questions