<html> <?php if (!empty($_post)) { $num = $_post["num"]; $count = 0; for ($i = 1; $i <= $num; ++$i) { if ($num % $i == 0) { $count++; } }} else { $num = ""; $count = "";} ?> <form action="" method="post"> <input type="text" name="num" value="<?php echo $num; ?>"/> <input type="button" name="tip" value="<?php if ($count == 2) { echo $num . "是素数"; } else { echo $num . "不是素数"; } ?>"/> <input type="submit" value="判断"/></form> </html>
以上就是php判断是否素数的详细内容。