15、表单处理全解析

表单处理全解析

1. 数字猜谜脚本与隐藏字段

在数字猜谜脚本中，若 guess 既不大于也不小于 $num_to_guess ，就可认为二者相等，并给变量赋予祝贺信息。之后只需在 HTML 主体中打印 $message 变量即可。

为了记录用户的猜测次数，我们可以使用隐藏字段。以下是添加了隐藏字段的数字猜谜脚本示例：

<?php
$num_to_guess = 42;
$message = "";
if ( ! isset( $_POST['guess'] ) ) {
    $message = "Welcome to the guessing machine!";
} else if ( $_POST['guess'] > $num_to_guess ) {
    $message = $_POST['guess']." is too big! Try a smaller number";
} else if ( $_POST['guess'] < $num_to_guess ) {
    $message = $_POST['guess']." is too small! Try a larger number";
} else { // must be equivalent
    $message = "Well done!";
}
$guess = (int) $_POST['guess'];
$num_tries = (int) $_POST['num_tries'];
$num_tries++;
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