array_unshift — Prepend one or more elements to the beginning of an array.
array_unshift() prepends passed elements to the front of the array. Note that the list of elements is prepended as a whole, so that the prepended elements stay in the same order. All numerical array keys will be modified to start counting from zero while literal keys won’t be changed.
Example #1 array_unshift() example
$queue = array("orange", "banana");
array_unshift($queue, "apple", "raspberry");
The above example will output:
 => apple
 => raspberry
 => orange
 => banana
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