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What will be the output of the following PHP code &lt...

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What will be the output of the following PHP code? 
<?php
$age = array("Peter"=>"35", "Ben"=>"37", "Joe"=>"43");
print_r(array_change_key_case($age, CASE_UPPER));
?>

Answer & Solution
Correct Answer: Option C
The array_change_key_case() function changes all keys in an array to lowercase or uppercase.
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