php 分享服务器端表单验证实例

php 服务器端表单验证实例，代码如下：

<?
if ($_POST[\'_submit_check\']) {
    if ($form_errors = validate_form()) {
        show_form($form_errors);
    } else {
        process_form();
    }
} else {
    show_form();
}

function process_form() {
    print \"Hello, \". $_POST[\'my_name\'];
}

function show_form($errors = \'\') {
    if ($errors) {
        print \'Please correct these errors: <ul><li>\';
        print implode(\'</li><li>\', $errors);
        print \'</li></ul>\';
    }

    print<<<_HTML_
<form method=\"POST\" action=\"$_SERVER[PHP_SELF]\">
Your name: <input type=\"text\" name=\"my_name\">
<br/>
<input type=\"submit\" value=\"Say Hello\">
<input type=\"hidden\" name=\"_submit_check\" value=\"1\">
</form>
_HTML_;
}

function validate_form() {
    $errors = array();

    if (strlen($_POST[\'my_name\']) < 3) {
        $errors[] = \'Your name must be at least 3 letters long.\';
    }
    return $errors;
}
?>

该代码有三个函数

1. process_form函数用于输出表单结果
2. show_form函数用于显示货创建表单
3. validate_form函数用于验证表单