PHP · Theory

Inheritance

Theory

58/352

Inheritance

Inheritance is a PHP topic. In plain words you use it for class Student in a small OOP file. Don’t start with a slogan — start with that picture.

Smallest example: new Student('Asha', 72). Type it, run it, and say what you see. If you can do that from memory, you know Inheritance.

From the example next to this theory — Inheritance: scores array, print avg, then high marks.

Trap — public everything. Fix that before you talk about advanced PHP.

Viva — what is Inheritance? Then show new Student('Asha', 72). Then name the trap.

Exam tip

What is Inheritance? Show this: new Student('Asha', 72). Trap: public everything.

Example

<?php
// Inheritance
$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";
}

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

Short notes

DefInheritance — class Student in a small OOP file.
Rulenew Student('Asha', 72)
Trappublic everything
Usea small OOP file

PHP · Theory

Inheritance

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Theory

58/352

Inheritance

Inheritance is a PHP topic. In plain words you use it for class Student in a small OOP file. Don’t start with a slogan — start with that picture.

Smallest example: new Student('Asha', 72). Type it, run it, and say what you see. If you can do that from memory, you know Inheritance.

From the example next to this theory — Inheritance: scores array, print avg, then high marks.

Trap — public everything. Fix that before you talk about advanced PHP.

Viva — what is Inheritance? Then show new Student('Asha', 72). Then name the trap.

Exam tip

What is Inheritance? Show this: new Student('Asha', 72). Trap: public everything.

Example

<?php
// Inheritance
$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";
}

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

Short notes

DefInheritance — class Student in a small OOP file.
Rulenew Student('Asha', 72)
Trappublic everything
Usea small OOP file

Inheritance

Example

Short notes

Questions

Inheritance

Example

Short notes

Questions