How can one efficiently iterate through a set of values in PHP and output each value only once?

When iterating through a set of values in PHP and outputting each value only once, you can use a combination of array_unique() and foreach loop. First, remove any duplicate values from the array using array_unique(). Then, loop through the unique values using a foreach loop to output each value only once. 

$values = [1, 2, 3, 2, 4, 5, 3];
$uniqueValues = array_unique($values);

foreach ($uniqueValues as $value) {
    echo $value . "<br>";
}

Keywords

PHP iteration array_unique foreach duplicates

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