Are there any common pitfalls to avoid when dealing with duplicate data display in PHP applications?

One common pitfall when dealing with duplicate data display in PHP applications is not properly checking for and removing duplicates before outputting the data. To avoid this issue, you can use an array to store unique values and only display items that have not been encountered before. 

// Example code to remove duplicates before displaying data
$originalData = ['apple', 'banana', 'apple', 'orange', 'banana'];

$uniqueData = array();
foreach ($originalData as $item) {
    if (!in_array($item, $uniqueData)) {
        $uniqueData[] = $item;
    }
}

foreach ($uniqueData as $item) {
    echo $item . "<br>";
}

Keywords

duplicate data display PHP applications data validation database queries

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