表单处理php

Question

我是新来的，所以如果我误解了如何在这里提出问题，请指出正确的方向。

1.我收到警告错误，说明我有“未定义的数组键”。我在递交表格之前和之后都会收到这份表格。我已经在顶部定义了数组，所以我不知道为什么没有定义它们。

如果输入不正确的电话号码格式，2.错误捕获不起作用。最初，我会得到错误声明，以便将其设置为正确的格式，但如果我将信息以正确的格式输入并提交，我仍然会得到错误，并将电话号码重置到最初的状态。我知道它正在从$_GET中提取它，但不知道为什么当它再次提交时，它没有更新$_GET来正确填充它。

<?php

function validate_field_contents($content, $title, $type, $message, ) {
    if($type == 'text') {
        $string_exp = "/^[A-Za-z0-9._%-]/";
        if(!preg_match($string_exp, $content)) {
            $message .= '<li>Please enter a valid ' . strtolower($title) . '.</li>';
        }
    } 
    elseif($type == 'email') {
        $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
        if(!preg_match($email_exp, $content)) {
            $message .= '<li>Please enter a valid ' . strtolower($title) . '.</li>';
        }
    }
    elseif($type == 'phone'){
        $num_exp = "/^\([0-9]{3}\)[0-9]{3}-[0-9]{4}$/";
         if(!preg_match($num_exp,$content)) {
             {$message .= '<li>Please enter a valid ' . strtolower($title) . ' in the following format (xxx)xxx-xxxx.</li>';}
        }
    }
    elseif($type == 'zip'){
        $num_exp = "/^[0-9]{5}$/";
         if(!preg_match($num_exp,$content)) {
             {$message .= '<li>Please enter a valid ' . strtolower($title) . ' with 5 numbers only.</li>';}
        }
    }
    elseif(empty($_POST['band'])){
            {$message .= '<li>Please select a ' . strtolower($title) . '.</li>';}
    }
    elseif(empty($type == 'color')){
         $message .= '<li>Please select a ' . strtolower($title) . '.</li>';
        }
    elseif(empty($type == 'size')){
         $message .= '<li>Please select a ' . strtolower($title) . '.</li>';
        }
    elseif(empty($type == 'style')){
         $message .= '<li>Please select a ' . strtolower($title) . '.</li>';
        }
    return $message;
}
?>

Answer 1

好吧，这里有几件事：

• 您不需要在顶部分配变量。这在C语言和其他语言中是非常重要的，但是PHP不需要这个。

• 您的if(isset($_GET['firstName'])) $firstName = $_GET['firstName'];语句使用$_GET，而<form>标记使用$_POST --这是您的主要问题--

• I建议使用一个变量数组，如下所示：

$address_vars =数组(数组(“element_name‘=> 'First Name”，'title’=>‘Name'，'validation’=> 'text'，)，数组( 'element_name‘=> 'lastName'，'title’=>‘lastName’，);

然后，您可以像这样以编程方式输出这些字段：

foreach($address_vars as $cur_address_field) {
    ?>
        <label><?php echo $cur_address_field['title']; ?>: <input type = "text" value="<?php echo (isset($_POST[$cur_address_field['element_name']]) ? $_POST[$cur_address_field['element_name']] : ''); ?>" id = "<?php echo $cur_address_field['element_name']; ?>" placeholder = "<?php echo $cur_address_field['title']; ?>" name ="<?php echo $cur_address_field['element_name']; ?>"></label>
    <?php
}

这不仅可以很好地清理代码，而且还可以使更改/更新甚至添加到字段中变得更加容易(而且更安全)。

然后，要验证字段，可以使用我设置的作为开关的validation数组键来遍历所有字段。就像这样：

foreach($address_vars as $validate_field) {
    if($validate_field['validation'] == 'text') {
        // this is a text-based field, so we check it against the text-only regex
        $string_exp = "/^[A-Za-z .'-]+$/";
        if(!preg_match($string_exp, $_POST[$validate_field['element_name']])) {
            $message .= '<li>Please enter a ' . strtolower($validate_field['title']) . ' containing letters and spaces only.</li>';
        }
    } elseif($validate_field['validation'] == 'email') {
        $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
        if(!preg_match($email_exp, $_POST[$validate_field['element_name']])) {
            $message .= '<li>Please enter a valid ' . strtolower($validate_field['title']) . '.</li>';
        }
    }
}

• 您没有正确地连接产品字段。用户提交的值无法在这里“粘贴”，因此字段的值就会丢失。首先，我们可以将所有这些都放在一个数组中，类似于我们对address字段所做的操作：

$product_vars =数组(数组(element_name‘=> 'band’、标题‘=> 'Band’、'options‘=> $bands、’占位符‘=>’$bands‘)、数组( 'element_name’=>‘颜色’、‘标题’=> 'Color‘、'options’=> $colors‘、’占位符‘=>’选择一个‘)、( 'element_name’=>‘色彩’、‘选项’=>$colors、‘占位符’=>‘选择一个’)。

然后，我们可以将以下内容用于表单：

foreach($product_vars as $cur_product) {
    ?>
            <label><?php echo $cur_product['title']; ?>: </label>
                <select name="<?php echo $cur_product['element_name']; ?>" size="1">
                    <option><?php echo $cur_product['placeholder']; ?></option>
                    <?php
                        foreach($cur_product['options'] as $cur_option)
                        {
                            echo "<option value = '".$cur_option."' ".(isset($_POST[$cur_product['element_name']]) && $_POST[$cur_product['element_name']] == $cur_option ? "selected='selected'" : "")."> $cur_option </option>";
                        }
                    ?>
                </select>
    <?php
}

希望这能帮上忙！

**编辑由于新代码共享**

这里又有一些东西。主要内容包括：$product_vars前端位于<form>标记之外，<form>标记不被设置为使用$_POST，尽管其他代码都是这样设置的，并且没有添加任何验证类型。我已经粘贴了我的全部代码，这是为我工作。

<?php
        //arrays
        $bands = array ("ACDC", "Journey", "Modest Mouse", "Band of Horses", "Vampire Weekend", "Of Monsters and Men", "Broken Bells", "Phoenix", "Fleetwood Mac", "AJR",);
        $colors = array ("Black", "Navy", "Red", "Orange", "Pink", "Yellow", "Green", "Gray", "White", "Purple",);
        $sizes = array ("X-Small", "Small", "Medium", "Large", "X-Large", "XX-Large", "XXX-Large",);
        $styles = array ("Tank Top", "T-Shirt", "Long Sleeve", "Hoodie", "Sweatshirt", "Jacket",);
        
        $product_vars = array(
        array( 'element_name' => 'band', 'title' => 'Band', 'options' => $bands, 'placeholder' => 'Choose One', ), 
        array( 'element_name' => 'color', 'title' => 'Color', 'options' => $colors, 'placeholder' => 'Choose One', ), 
        array( 'element_name' => 'size', 'title' => 'Size', 'options' => $sizes, 'placeholder' => 'Choose One', ), 
        array( 'element_name' => 'style', 'title' => 'Style', 'options' => $styles, 'placeholder' => 'Choose One', ), 
        );
    
        $address_vars = array(
        array(  'element_name' => 'firstName', 'title' => 'First Name', 'validation' => 'text',),
        array(  'element_name' => 'lastName',   'title' => 'Last Name', 'validation' => 'text',),
        array(  'element_name' => 'email', 'title' => 'Email Address', 'validation' => 'email',),
        array(  'element_name' => 'phone', 'title' => 'Phone Number', 'validation' => 'phone',),
        array(  'element_name' => 'address', 'title' => 'Address', 'validation' => 'address',),
        array(  'element_name' => 'city', 'title' => 'City', 'validation' => 'text',),
        array(  'element_name' => 'state', 'title' => 'State', 'validation' => 'text',),
        array(  'element_name' => 'zip', 'title' => 'Zip Code', 'validation' => 'zip',),
        );
    
        ?>
        <form action="" method="post">
        <?php
        foreach($product_vars as $cur_product) {
        ?>
                <label><?php echo $cur_product['title']; ?>: </label>
                    <select name="<?php echo $cur_product['element_name']; ?>" size="1">
                        <option><?php echo $cur_product['placeholder']; ?></option>
                        <?php
                            foreach($cur_product['options'] as $cur_option)
                            {
                                echo "<option value = '".$cur_option."' ".(isset($_POST[$cur_product['element_name']]) && $_POST[$cur_product['element_name']] == $cur_option ? "selected='selected'" : "")."> $cur_option </option>";
                            }
                        ?>
                    </select>
        <?php
        }
        foreach($address_vars as $cur_address_field) {
        ?>
    
            <label><?php echo $cur_address_field['title']; ?>: 
                <input 
                type = "text" 
                value="<?php echo (isset($_POST[$cur_address_field['element_name']]) ? $_POST[$cur_address_field['element_name']] : ''); ?>" 
                id = "<?php echo $cur_address_field['element_name']; ?>" 
                placeholder = "<?php echo $cur_address_field['title']; ?>" 
                name ="<?php echo $cur_address_field['element_name']; ?>">  
            </label>
            <?php } ?>
                <input type="reset" class="buttons">
                <input type="submit" class="buttons">
            </form>
        <?php


        foreach($address_vars as $validate_field) {
            $message = validate_field_contents($_POST[$validate_field['element_name']], $validate_field['title'], $validate_field['validation'], $message);
        }
        ?>
    
    
    <!DOCTYPE html>
    <html lang="en">
        <head>
            <title>T-Shirt Form</title>
            <link type="text/css" rel="stylesheet" href="css/style-prod.css">
            <script src="..js/script.js" defer></script>
        </head>
        <body>          
    
            <?php
            if($message) {
                echo '<p>'.$message.'</p>';
            } else {
            ?>

            <!--display processed information here-->
            <h3 class="subheaderone">Thank you for your order!</h3><br>
            <h3 class = "subheadertwo">Product:</h3>
            <div class = "output">
            
                <h3 class = "subheadertwo">Shipping & Contact Information:</h3>
                <?php foreach($address_vars as $cur_address) {
                    echo '<p>' . $cur_address['title'] . ': ' . (isset($_POST[$cur_address['element_name']]) ? $_POST[$cur_address['element_name']] : '') . '</p>';
                } ?>
            </div>
            <div class="another"> 
                <nav><a href="./products.php"> Submit Another Form</a></nav> 
            </div>
            <?php } ?>
        </body>
    </html>


<?php

function validate_field_contents($content, $title, $type, $message) {
    if($type == 'text') {
        // this is a text-based field, so we check it against the text-only regex
        $string_exp = "/^[A-Za-z .'-]+$/";
        if(!preg_match($string_exp, $content)) {
            $message .= '<li>Please enter a valid ' . strtolower($title) . ' containing letters and spaces only.</li>';
        }
    } elseif($type == 'email') {
        $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';
        if(!preg_match($email_exp, $content)) {
            $message .= '<li>Please enter a valid ' . strtolower($title) . '.</li>';
        }
    }
    return $message;
}