Question

How to delete duplicate elements from one dimensional int array in PHP

Answer 1

$arr = array(1, 2, 3, 2, 5, 6, 6, 2);

$arr = array_unique($arr);
echo "<pre>";
print_r($arr);
echo "</pre>";
  
/*
run:
   
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [4] => 5
    [5] => 6
)
   
*/

 

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Answer 2

$arr = array(1, 2, 3, 2, 5, 6, 6, 2); 

$size = count($arr);
  
for ($i = 0; $i < $size; $i++) 
{
    for ($j = $i + 1; $j < $size; $j++) 
    {
        if (isset($arr[$j]) && isset($arr[$i]))
            if ($arr[$j] == $arr[$i]) 
                unset($arr[$j]);
    }
}

echo "<pre>";
print_r($arr);
echo "</pre>";

  
/*
run:
   
Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [4] => 5
    [5] => 6
)
   
*/

 

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