PHP · Theory

sha1()

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Theory

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sha1()

sha1() is simple if you keep it on paper. Priya uses it for Priya walking through sha1 in a campus project.

Do sha1() once by hand. one sha1 step Priya can write from memory. Change one input. Say the new result out loud.

Skip sha1() and copy-pasting sha1 without a dry-run shows up in a campus project.

sha1() shows up in a campus project. Name Priya walking through sha1, not “a real-world scenario”.

sha1() trap — copy-pasting sha1 without a dry-run. Priya loses marks for that every viva.

After sha1(), Priya should still remember copy-pasting sha1 without a dry-run.

Viva for sha1(): what it is → one sha1 step Priya can write from memory → the mistake (copy-pasting sha1 without a dry-run).

Exam tip

Board: Priya walking through sha1. Dry-run sha1(). Name the trap: copy-pasting sha1 without a dry-run.

Example

<?php
// sha1()
$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";
}

sha1(): scores array, print avg, then high marks. Say the output.

Short notes

Defsha1() — Priya uses it for Priya walking through sha1 in a campus project.
Rulesha1() → one sha1 step Priya can write from memory.
Remembersha1() + a .php page (a campus project).
Usesha1() in a campus project (Priya walking through sha1).
Trapsha1() — copy-pasting sha1 without a dry-run.
Exsha1() → Priya walking through sha1.

PHP · Theory

sha1()

← All stacks

Theory

222/352

sha1()

sha1() is simple if you keep it on paper. Priya uses it for Priya walking through sha1 in a campus project.

Do sha1() once by hand. one sha1 step Priya can write from memory. Change one input. Say the new result out loud.

Skip sha1() and copy-pasting sha1 without a dry-run shows up in a campus project.

sha1() shows up in a campus project. Name Priya walking through sha1, not “a real-world scenario”.

sha1() trap — copy-pasting sha1 without a dry-run. Priya loses marks for that every viva.

After sha1(), Priya should still remember copy-pasting sha1 without a dry-run.

Viva for sha1(): what it is → one sha1 step Priya can write from memory → the mistake (copy-pasting sha1 without a dry-run).

Exam tip

Board: Priya walking through sha1. Dry-run sha1(). Name the trap: copy-pasting sha1 without a dry-run.

Example

<?php
// sha1()
$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";
}

sha1(): scores array, print avg, then high marks. Say the output.

Short notes

Defsha1() — Priya uses it for Priya walking through sha1 in a campus project.
Rulesha1() → one sha1 step Priya can write from memory.
Remembersha1() + a .php page (a campus project).
Usesha1() in a campus project (Priya walking through sha1).
Trapsha1() — copy-pasting sha1 without a dry-run.
Exsha1() → Priya walking through sha1.

sha1()

Example

Short notes

Questions

sha1()

Example

Short notes

Questions