What will be the output of the following PHP code?<br/>$a1 = array("red", "green");<br/>$a2 = array("blue", "yellow");<br/>$a3 = array_merge($a1, $a2);<br/>$a4 = array("a", "b", "c", "d");<br/>$a = array_combine($a4, $a3);<br/>print_r($a);

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What array will you get if you convert an object to an array?

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There are three different kind of arrays:

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