[Solved] Change values in an array

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I’d do the following:

$prefix = 'HPO';
foreach ($values as $value){
    //loop trhough the values
    $string ='';
    $string = sprintf("%'.010d\n", $value);
    $string = $prefix.$string;
    echo $string;
}

sprintf will help you to build complex strings with length control and many more features. See the manual for more informations.

solved Change values in an array