How can PHP developers efficiently handle and display unique values from a CSV file without using a database, considering the limitations of array_unique and in_array functions?

When handling and displaying unique values from a CSV file without using a database, PHP developers can encounter limitations with the array_unique and in_array functions due to memory constraints and performance issues. To efficiently handle this, developers can use a combination of file handling functions and associative arrays to store and display unique values from the CSV file. 

<?php
$uniqueValues = [];

if (($handle = fopen("data.csv", "r")) !== FALSE) {
    while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {
        foreach ($data as $value) {
            if (!isset($uniqueValues[$value])) {
                $uniqueValues[$value] = true;
                echo $value . "<br>";
            }
        }
    }
    fclose($handle);
}
?>

Keywords

PHP CSV file unique values array_unique in_array

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