How can PHP developers ensure that variables are only output once in a loop to prevent duplication of values?

To ensure that variables are only output once in a loop and prevent duplication of values, PHP developers can use a flag variable to keep track of whether the variable has been output already. By checking this flag before outputting the variable, developers can ensure that it is only displayed once. 

$flag = false;

foreach($array as $item) {
    if(!$flag) {
        echo $item;
        $flag = true;
    }
}

Keywords

PHP loop variable output duplication values

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