PHP · Theory

strstr()

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Theory

261/352

strstr()

strstr() is simple if you keep it on paper. Ananya uses it for Ananya walking through strstr in lab hour.

For strstr(), Apache/Nginx is in play. Don’t blame it until you have traced Ananya walking through strstr.

strstr() exists so Ananya can keep Ananya walking through strstr correct in lab hour.

strstr() shows up in lab hour. Name Ananya walking through strstr, not “a real-world scenario”.

Don’t do this with strstr() — copy-pasting strstr without a dry-run. Interviewers spot it in ten seconds.

After strstr(), Ananya should still remember copy-pasting strstr without a dry-run.

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

Exam tip

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

Example

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

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

Short notes

Defstrstr() — Ananya uses it for Ananya walking through strstr in lab hour.
Rulestrstr() → one strstr step Ananya can write from memory.
Rememberstrstr() + Apache/Nginx (lab hour).
Usestrstr() in lab hour (Ananya walking through strstr).
Trapstrstr() — copy-pasting strstr without a dry-run.
Exstrstr() → Ananya walking through strstr.

PHP · Theory

strstr()

← All stacks

Theory

261/352

strstr()

strstr() is simple if you keep it on paper. Ananya uses it for Ananya walking through strstr in lab hour.

For strstr(), Apache/Nginx is in play. Don’t blame it until you have traced Ananya walking through strstr.

strstr() exists so Ananya can keep Ananya walking through strstr correct in lab hour.

strstr() shows up in lab hour. Name Ananya walking through strstr, not “a real-world scenario”.

Don’t do this with strstr() — copy-pasting strstr without a dry-run. Interviewers spot it in ten seconds.

After strstr(), Ananya should still remember copy-pasting strstr without a dry-run.

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

Exam tip

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

Example

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

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

Short notes

Defstrstr() — Ananya uses it for Ananya walking through strstr in lab hour.
Rulestrstr() → one strstr step Ananya can write from memory.
Rememberstrstr() + Apache/Nginx (lab hour).
Usestrstr() in lab hour (Ananya walking through strstr).
Trapstrstr() — copy-pasting strstr without a dry-run.
Exstrstr() → Ananya walking through strstr.

strstr()

Example

Short notes

Questions

strstr()

Example

Short notes

Questions