[Solved] Consider this PHP code snippet: $arr = ['x' => 'dog', 'y' => 'cat', 'z' => 'dog']; $result = array_flip($arr); print_r($result); What is the problem with this code? | PHP

PHP - Array Functions

Consider this PHP code snippet:

$arr = ['x' => 'dog', 'y' => 'cat', 'z' => 'dog'];
$result = array_flip($arr);
print_r($result);

What is the problem with this code?

ANo problem; output will be correct

BIt causes a syntax error because array_flip requires numeric keys

Carray_flip cannot flip string keys

DThe duplicate values cause keys to be overwritten in the flipped array

Step-by-Step Solution

Solution:

Step 1: Understand array_flip() behavior with duplicates
When flipping, values become keys. Duplicate values cause keys to overwrite previous ones.
Step 2: Analyze the example
'dog' appears twice as a value. After flipping, only the last key ('z') remains for 'dog'.
Final Answer:
The duplicate values cause keys to be overwritten in the flipped array -> Option D
Quick Check:
Duplicate values overwrite keys when flipped [OK]

Quick Trick: Duplicates in values overwrite keys after flip [OK]

Common Mistakes:

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