PHP · Theory

Introduction

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Theory

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Introduction

Introduction is a PHP idea you prove with a hello.php page, not with a slogan.

For Introduction, Apache/Nginx is in play. Don’t blame it until you have traced a hello.php page.

Introduction exists so Riya can keep a hello.php page correct in a college portal.

Introduction shows up in a college portal. Name a hello.php page, not “a real-world scenario”.

Introduction trap — calling PHP a database. Riya loses marks for that every viva.

After Introduction, Riya should still remember calling PHP a database.

One breath for Introduction, then a hello.php page, then calling PHP a database. Sit down.

Diagram

  Browser
      │ POST / GET
      ▼
   .php file
      │
      ▼
   HTML back

Exam tip

Say Introduction in one breath, then <?php echo 'Hi'; ?>, then calling PHP a database.

Example

<?php
// Introduction
$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";
}

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

Short notes

DefIntroduction — Riya uses it for a hello.php page in a college portal.
RuleIntroduction → <?php echo 'Hi'; ?>.
RememberIntroduction + Apache/Nginx (a college portal).
UseIntroduction in a college portal (a hello.php page).
TrapIntroduction — calling PHP a database.
ExIntroduction → a hello.php page.

PHP · Theory

Introduction

← All stacks

Theory

1/352

Introduction

Introduction is a PHP idea you prove with a hello.php page, not with a slogan.

For Introduction, Apache/Nginx is in play. Don’t blame it until you have traced a hello.php page.

Introduction exists so Riya can keep a hello.php page correct in a college portal.

Introduction shows up in a college portal. Name a hello.php page, not “a real-world scenario”.

Introduction trap — calling PHP a database. Riya loses marks for that every viva.

After Introduction, Riya should still remember calling PHP a database.

One breath for Introduction, then a hello.php page, then calling PHP a database. Sit down.

Diagram

  Browser
      │ POST / GET
      ▼
   .php file
      │
      ▼
   HTML back

Exam tip

Say Introduction in one breath, then <?php echo 'Hi'; ?>, then calling PHP a database.

Example

<?php
// Introduction
$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";
}

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

Short notes

DefIntroduction — Riya uses it for a hello.php page in a college portal.
RuleIntroduction → <?php echo 'Hi'; ?>.
RememberIntroduction + Apache/Nginx (a college portal).
UseIntroduction in a college portal (a hello.php page).
TrapIntroduction — calling PHP a database.
ExIntroduction → a hello.php page.

Introduction

Example

Short notes

Questions

Introduction

Example

Short notes

Questions