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PHP · Theory

Associative Array

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Theory

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Associative Array

Priya only reaches for Associative Array when $student['roll'] has to stay correct in a class list.

Associative Array order — meaning → ['name'=>'Asha','roll'=>12] → one limit. Dumping ten features helps nobody.

Associative Array exists so Priya can keep $student['roll'] correct in a class list.

Use Associative Array when $student['roll'] must stay clear. If a simpler PHP step works, use that instead.

Associative Array trap — mixing 0-based and named keys blindly. Priya loses marks for that every viva.

Associative Array is not a lonely heading. Priya ties it to $student['roll'].

Close Associative Array with: “If I skip it, $student['roll'] goes wrong like this: mixing 0-based and named keys blindly.”

Exam tip

For Associative Array: definition + a class list + one failure.

Example

<?php
$langs = ["PHP", "JS", "SQL"];
$langs[] = "Python";
foreach ($langs as $i => $lang) {
  echo "$i: $lang\n";
}

Associative Array — pHP arrays are ordered maps. foreach walks key and value.

Short notes

  • DefAssociative Array — Priya uses it for $student['roll'] in a class list.
  • RuleAssociative Array → ['name'=>'Asha','roll'=>12].
  • RememberAssociative Array + the PHP runtime (a class list).
  • UseAssociative Array in a class list ($student['roll']).
  • TrapAssociative Array — mixing 0-based and named keys blindly.
  • ExAssociative Array → $student['roll'].

Questions

1

Priya asks: why does Associative Array exist? Use $student['roll'].

2

When would Priya actually reach for Associative Array?

3

Which mistake makes $student['roll'] fail?

4

Change one input on $student['roll']. Predict the new result.

Previous← Indexed ArrayNextMultidimensional Array →
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