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PHP determines whether a prime number is

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Release： 2023-02-27 12:10:02

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PHP determines whether a prime number is

Determine whether it is a prime number. A prime number refers to a natural number that has no other factors except 1 and itself among natural numbers greater than 1. (Recommended learning: PHP video tutorial)

<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>

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