PHP program to create a function that returns true for all elements of an array, false otherwise.

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<?php
function test_all($items, $my_func)
{
    if (count(array_filter($items, $my_func)) === count($items))
      return 1;
      else
      return 0;
}
echo test_all([2, 3, 4, 5], function ($item) {return $item > 0;}); 
echo "\n";
echo test_all([-2, -3, -4, -5], function ($item) {return $item > 0;}); 
echo "\n";
echo test_all([-2, 3, 4, -5], function ($item) {return $item > 0;});
?>


Output:

1
0
0

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function deep_flatten($items)
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