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<?php
 
$array1 = [1, 6, 7, 8, 9, 10 ,11];
 
$array2 = [8, 9, 11];
 
$array3 = array_diff($array1, $array2);
 
var_dump($array3);

Success #stdin #stdout 0s 52488KB

stdin

Standard input is empty

stdout

array(4) {
  [0]=>
  int(1)
  [1]=>
  int(6)
  [2]=>
  int(7)
  [5]=>
  int(10)
}

https://ideone.com/1gnPmH

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PHP (php 7.3.5)

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