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PHP · Theory

hex2bin()

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Theory

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hex2bin()

hex2bin() is simple if you keep it on paper. Zara uses it for hex2bin on Zara's board in a campus project.

For hex2bin(), Apache/Nginx is in play. Don’t blame it until you have traced hex2bin on Zara's board.

Without hex2bin(), a campus project gets messy and hex2bin on Zara's board is hard to trust.

hex2bin() shows up in a campus project. Name hex2bin on Zara's board, not “a real-world scenario”.

Don’t do this with hex2bin() — only reciting the name of hex2bin. Interviewers spot it in ten seconds.

hex2bin() is not a lonely heading. Zara ties it to hex2bin on Zara's board.

Viva for hex2bin(): what it is → one hex2bin step Zara can write from memory → the mistake (only reciting the name of hex2bin).

Exam tip

For hex2bin(): definition + a campus project + one failure.

Example

<?php
// hex2bin()
$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";
}

hex2bin(): scores array, print avg, then high marks. Say the output.

Short notes

  • Defhex2bin() — Zara uses it for hex2bin on Zara's board in a campus project.
  • Rulehex2bin() → one hex2bin step Zara can write from memory.
  • Rememberhex2bin() + Apache/Nginx (a campus project).
  • Usehex2bin() in a campus project (hex2bin on Zara's board).
  • Traphex2bin() — only reciting the name of hex2bin.
  • Exhex2bin() → hex2bin on Zara's board.

Questions

1

What is hex2bin()? Teach it with hex2bin on Zara's board.

2

When would Zara actually reach for hex2bin()?

3

Viva: one wrong answer people give for hex2bin().

4

Write the smallest hex2bin() step on hex2bin on Zara's board. What happens?

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