Regarding Andre D function to test if all values in an array
of booleans are true, you can also use:
<?php
$allTrue = (! in_array(false, $arrayToCheck));
?>
Both this method and Andre D's are O(n), but this method has
a lower k in the average case: in_array() stops once it
finds the first false, while array_product must always
traverse the entire array.
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