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What will be the output of the following PHP code (22)?

92. What will be the output of the following PHP code?

<?php
$counter = 1;

while ($counter++ <= 5)
{
    echo $counter, ",";
    $counter++;
}
?>  

1. 2,4,
2. 1,2,3,4,5,
3. 2,4,6,
4. 1,2,4,

Answer: C) 2,4,6,

Explanation:

In the while expression, the statement $counter++ is a post-increment operation and it executes after checking the condition. Thus, the output will be "2,4,6,".