How can one prevent duplicate entries from being displayed in a PHP output?

To prevent duplicate entries from being displayed in a PHP output, you can use an array to keep track of the entries that have already been displayed. Before displaying each entry, you can check if it is already in the array. If it is not, display the entry and add it to the array. This way, only unique entries will be displayed. 

<?php
$entries = array(); // Array to store displayed entries

// Loop through entries and display only if not already displayed
foreach ($allEntries as $entry) {
    if (!in_array($entry, $entries)) {
        echo $entry;
        $entries[] = $entry; // Add entry to array
    }
}
?>

Keywords

PHP duplicate entries prevent output array_unique

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