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array_diff()

« array_count_values | array_diff_assoc »
<?php
$array = array_diff (
    , // array $array1
      // array $array2
);
?>
Result
$array = [
  1 => 'blue',
]
Examples
#1 array_diff  (["a" => "green", 0 => "red", 1 => "blue", 2 => "red"],
 ["b" => "green", 0 => "yellow", 1 => "red"])
See also
array_diff_assoc, array_diff_key, array_diff_uassoc, array_diff_ukey, array_intersect, array_intersect_assoc
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