What is the method for removing duplicates from a PHP array?

1 year ago
Liam
1 minute

There are several methods to remove duplicates from a PHP array.

  1. By using the array_unique() function, you can eliminate duplicate values from an array and receive a new array as a result. For example:
$array = array(1, 2, 2, 3, 4, 4);
$newArray = array_unique($array);
print_r($newArray);

Output: Array containing elements 1, 2, 3, and 4.

  1. You can utilize the array_flip() function to use the values in an array as keys and remove any duplicates. For example:
$array = array(1, 2, 2, 3, 4, 4);
$newArray = array_flip(array_flip($array));
print_r($newArray);

Output: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

  1. Eliminate duplicates using a loop iteration: Iterate through the array, storing each element one by one into a new array. If the element does not already exist in the new array, then it will be stored in the new array. For example:
$array = array(1, 2, 2, 3, 4, 4);
$newArray = array();
foreach ($array as $value) {
    if (!in_array($value, $newArray)) {
        $newArray[] = $value;
    }
}
print_r($newArray);

Output: Array with elements 1, 2, 3, and 4.

These are three commonly used methods for removing duplicates from PHP arrays. Choose the appropriate method according to your specific situation.

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