PHP Arrays
Which function will return true if a variable is an array or false if it is not?

do_array()
in_array()
is_array()
this_array()

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

Array ( [a] => red [b] => green [c] => blue [d] => yellow )
Array ( [a] => blue [b] => yellow [c] => red [d] => green )
Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [0] => red [1] => green [2] => blue [3] => yellow )

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PHP Arrays
What will be the output of the following PHP code?
$cars = array("Volvo", "BMW", "Toyota", "Honda", "Mercedes", "Opel");
print_r(array_chunk($cars, 2));

Array ( [0] => Array ( [0] => Volvo [1] => BMW ) [1] => Array ( [0] => Toyota [1] => Honda ) [2] => Array ( [0] => Mercedes [1] => Opel ) )
Array ( [1] => Array ( [1] => Volvo [2] => BMW ) [2] => Array ( [1] => Toyota [2] => Honda ) [3] => Array ( [1] => Mercedes [2] => Opel ) )
Array ( [0] => Array ( [0] => Volvo [1] => Volvo ) [1] => Array ( [0] => BMW [1] => BMW ) [2] => Array ( [0] => Toyota [1] => Toyota ) )
Array ( [0] => Array ( [1] => Volvo [2] => BMW ) [1] => Array ( [1] => Toyota [2] => Honda ) [2] => Array ( [1] => Mercedes [2] => Opel ) )

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PHP Arrays
What will be the output of the following PHP code ?
$array = array("red", "green");
array_push($array, "blue", "yellow");
print_r($array);

Array ( [0] => blue [1] => yellow [2] => red [3] => green )
Array ( [0] => red [1] => green )
Array ( [0] => blue [1] => yellow )
Array ( [0] => red [1] => green [2] => blue [3] => yellow )

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