Solution:Step 1: Understand duplicate keys in associative arraysPHP overwrites earlier values with later ones for duplicate keys.Step 2: Identify value for key "a"Last value 3 overwrites first 1.Final Answer:3 because last key overwrites -> Option BQuick Check:Duplicate keys keep last value [OK]

[Solved] Given this code:$arr = ["a" => 1, "b" => 2, "a" => 3];echo $arr["a"];What will be the output and why? | PHP

PHP - Arrays

Given this code:

$arr = ["a" => 1, "b" => 2, "a" => 3];
echo $arr["a"];

What will be the output and why?

A1 because first key wins

B3 because last key overwrites

CError due to duplicate keys

DUndefined because keys conflict

Step-by-Step Solution

Solution:

Step 1: Understand duplicate keys in associative arrays
PHP overwrites earlier values with later ones for duplicate keys.
Step 2: Identify value for key "a"
Last value 3 overwrites first 1.
Final Answer:
3 because last key overwrites -> Option B
Quick Check:
Duplicate keys keep last value [OK]

Quick Trick: Duplicate keys overwrite earlier values with last one [OK]

Common Mistakes:

Expecting error on duplicates
Thinking first value stays
Confusing keys and values

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Given this code:

Step 1: Understand duplicate keys in associative arrays

Step 2: Identify value for key "a"

Final Answer:

Quick Check:

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