PHP Arrays
Which function returns an array consisting of associative key/value pairs?

count_values()
array_count()
count()
array_count_values()

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

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PHP Arrays
What will be the output of the following PHP code ?
$a1 = array("a" => "red", "b" => "green", "c" => "blue", "d" => "yellow");
$result = array_flip($a1);
print_r($result);

Array ( [a] => a [b] => b [c] => c [d] => d )
Array ( [red] => a [green] => b [blue] => c [yellow] => d )
Array ( [red] => red [green] => green [blue] => blue [yellow] => yellow )
Array ( [a] => red [b] => green [c] => blue [d] => yellow )

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