PHP · Theory

Constants

Theory

12/352

Constants

Constants sits in lab hour. Dev’s job is a Constants dry-run. Write that first.

Constants order — meaning → one Constants step Dev can write from memory → one limit. Dumping ten features helps nobody.

Constants exists so Dev can keep a Constants dry-run correct in lab hour.

Use Constants when a Constants dry-run must stay clear. If a simpler PHP step works, use that instead.

Constants miss — only reciting the name of Constants. Fix it before you talk about advanced PHP.

Place Constants next to nearby PHP work — one Constants step Dev can write from memory is the link.

Close Constants with — “If I skip it, a Constants dry-run goes wrong like this: only reciting the name of Constants.”

Exam tip

Say Constants in one breath, then one Constants step Dev can write from memory, then only reciting the name of Constants.

Example

<?php
// Constants
$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";
}

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

Short notes

DefConstants — Dev uses it for a Constants dry-run in lab hour.
RuleConstants → one Constants step Dev can write from memory.
RememberConstants + a .php page (lab hour).
UseConstants in lab hour (a Constants dry-run).
TrapConstants — only reciting the name of Constants.
ExConstants → a Constants dry-run.

PHP · Theory

Constants

← All stacks

Theory

12/352

Constants

Constants sits in lab hour. Dev’s job is a Constants dry-run. Write that first.

Constants order — meaning → one Constants step Dev can write from memory → one limit. Dumping ten features helps nobody.

Constants exists so Dev can keep a Constants dry-run correct in lab hour.

Use Constants when a Constants dry-run must stay clear. If a simpler PHP step works, use that instead.

Constants miss — only reciting the name of Constants. Fix it before you talk about advanced PHP.

Place Constants next to nearby PHP work — one Constants step Dev can write from memory is the link.

Close Constants with — “If I skip it, a Constants dry-run goes wrong like this: only reciting the name of Constants.”

Exam tip

Say Constants in one breath, then one Constants step Dev can write from memory, then only reciting the name of Constants.

Example

<?php
// Constants
$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";
}

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

Short notes

DefConstants — Dev uses it for a Constants dry-run in lab hour.
RuleConstants → one Constants step Dev can write from memory.
RememberConstants + a .php page (lab hour).
UseConstants in lab hour (a Constants dry-run).
TrapConstants — only reciting the name of Constants.
ExConstants → a Constants dry-run.

Constants

Example

Short notes

Questions

Constants

Example

Short notes

Questions