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<p><br /></p> <pre class="brush:php;toolbar:false;">public static function generateReceiptNumber(int $id) { $receipt_number = sprintf(' d', $id % 100000000); return $receipt_number; }</pre> <p>I am using the above code to convert the incoming $id to a minimum 6 digit, maximum 8 digit number. For example: 000001 - 99999999</p> <p>But there is a flaw in this code. When $id equals 100000000, it will return 000000. How should I improve the above code to return 000001? </p> <p>By analogy, $id is the auto-incremented ID of the database. </p> <p>The reason I want to achieve this is because I have a display text box with a text limit of only 8 digits and I can only count the numbers back up from 000001 and keep repeating. </p>

public static function generateReceiptNumber(int $id)
{
? ? // 處理特殊情況，當$id為100000000時 ? ? if ($id === 100000000) {
? ? ? ? return '000001';
? ? }

? ? // 使用取模運算將ID限制在范圍0到99,999,99 ? ? $limited_id = $id % 100000000;
? ??
? ? // 格式化限制的ID，使用前導(dǎo)零確保至少6位 ? ? $receipt_number = sprintf('%06d', $limited_id);
? ??
? ? return $receipt_number;
}

function generateReceiptNumber(int $id)
{
    while($id>=100000000)
        $id -= 100000000 - 1;
    return sprintf('%06d', $id);
}