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PHP · Theory

array_intersect_assoc()

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Theory

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array_intersect_assoc()

array_intersect_assoc() (function) is simple if you keep it on paper. Amit uses it for a array_intersect_assoc function dry-run in a first job task.

Keep array_intersect_assoc() (function) small. Amit should finish a array_intersect_assoc function dry-run in a few lines, not a 40-line dump.

Skip array_intersect_assoc() (function) and copy-pasting array_intersect_assoc function without a dry-run shows up in a first job task.

Use array_intersect_assoc() (function) when a array_intersect_assoc function dry-run must stay clear. If a simpler PHP step works, use that instead.

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

After array_intersect_assoc() (function), Amit should still remember copy-pasting array_intersect_assoc function without a dry-run.

One breath for array_intersect_assoc() (function), then a array_intersect_assoc function dry-run, then copy-pasting array_intersect_assoc function without a dry-run. Sit down.

Exam tip

Say array_intersect_assoc() (function) in one breath, then one array_intersect_assoc function step Amit can write from memory, then copy-pasting array_intersect_assoc function without a dry-run.

Example

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

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

Short notes

  • Defarray_intersect_assoc() (function) — Amit uses it for a array_intersect_assoc function dry-run in a first job task.
  • Rulearray_intersect_assoc() (function) → one array_intersect_assoc function step Amit can write from memory.
  • Rememberarray_intersect_assoc() (function) + the PHP runtime (a first job task).
  • Usearray_intersect_assoc() (function) in a first job task (a array_intersect_assoc function dry-run).
  • Traparray_intersect_assoc() (function) — copy-pasting array_intersect_assoc function without a dry-run.
  • Exarray_intersect_assoc() (function) → a array_intersect_assoc function dry-run.

Questions

1

Amit asks: why does array_intersect_assoc() (function) exist? Use a array_intersect_assoc function dry-run.

2

When would Amit actually reach for array_intersect_assoc() (function)?

3

What trap does Amit hit with array_intersect_assoc() (function)?

4

Show array_intersect_assoc() (function) in the PHP runtime terms — three lines max.

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