[Solved] How To Group and Sort Array element base Specific Character [closed]

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You can use usort by string compare and the add prefix to each element with str_repeat

Consider:

$arr = array("10", "1001","12", "1201","1002", "1202","120101", "120201","13");

usort($arr, "strcasecmp"); // sorting the array by string and not array
function addPre($v) {
    $mul = strlen($v) / 2; // check the string size and divided by 2 as your example
    return str_repeat("\t", $mul - 1) . str_repeat("-", $mul) . $v;
}

foreach($arr as $e)
    echo addPre($e) . PHP_EOL;

Reference: str-repeat, usort

solved How To Group and Sort Array element base Specific Character [closed]