array index

Array index can be string or integer. The following a problem regarding array index. Let's see the mock zend certification test question.

Question:
What is the output of this code snippet?


$a = array(0.001 => 'b', .1 => 'c');

print_r($a);

?>

Answer:
1. An empty array
2. 0.001 => 'b', .1 => c
3. 0 => 'c'
Because the fractional part will be converted to the nearest integer.
4. '0.001' => 'b', '0.1' => c'
5. A Syntax Error
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