如何使用php验证输入字段

Question

如何验证用户在联系表格中输入的联系号码是否为实际号码且至少为 10 个号码？这意味着我希望输入字段只接受 10 个或更多数字，并且还接受加号 (+)。目前 php 验证所有字段均已填写且电子邮件正确。

这里是html代码：

            <div class="contact-form">
                <form id="contact-form" action="sendmail.php" method="post" title="Contact Form" role="form">
                    <div class="col-sm-6">
                        <div class="form-group">
                            <label for="contact-name">Full name</label>
                            <input type="text" name="name" placeholder="Enter your full name..." class="contact-name" id="contact-name">
                        </div>
                        <div class="form-group">
                            <label for="contact-email">Email</label>
                            <input type="text" name="email" placeholder="Enter your email..." class="contact-email" id="contact-email">
                        </div>
                        <div class="form-group">
                            <label for="contact-number">Contact number</label>
                            <input type="text" name="number" class="active" id="contact-number" placeholder="Your contact number...">
                        </div>
                    </div>
                    <div class="col-sm-6">
                        <div class="form-group">
                            <label for="contact-message">Message</label>
                            <textarea name="message" placeholder="Your message..." class="contact-message" id="contact-message"></textarea>
                        </div>
                    </div>
                    <div class="col-sm-12 text-center">
                        <button type="submit" class="btn btn-default sketchFlowPrint" id="submit">Send</button>
                    </div>
                </form>
          </div>

这里是php代码：

<?php

// Email address verification
function isEmail($email) {
    return preg_match('|^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]{2,})+$|i', $email);
};

if($_POST) {

    // Enter the email where you want to receive the message
    $emailTo = 'example@gmail.com';

    $clientName = addslashes(trim($_POST['name']));
    $clientEmail = addslashes(trim($_POST['email']));
    $number = addslashes(trim($_POST['number']));
    $message = addslashes(trim($_POST['message']));

    $subject = 'Query from My Domain';

    $sendMessage = 'Hi' . "\n\n";
    $sendMessage .= $message . "\n\n";
    $sendMessage .= 'From: ' . $clientName . "\n";
    $sendMessage .= 'Email: ' . $clientEmail . "\n";
    $sendMessage .= 'Contact number: ' . $number . "\n";

    $array = array();
    $array['nameMessage'] = '';
    $array['emailMessage'] = '';
    $array['numberMessage'] = '';
    $array['messageMessage'] = '';

    if($clientName == '') {
        $array['nameMessage'] = 'Please enter your full name.';
    }
    if(!isEmail($clientEmail)) {
        $array['emailMessage'] = 'Please insert a valid email address.';
    }
    if($number == '') {
        $array['numberMessage'] = 'Please enter a valid contact number.';
    }
    if($message == '') {
        $array['messageMessage'] = 'Please enter your message.';
    }
    if($clientName != '' && isEmail($clientEmail) && $message != '') {
    // Send email
    $headers = "From: " . $clientName . ' <' . $clientEmail . '>' . "\r\n";
    $headers .= PHP_EOL;
    $headers .= "MIME-Version: 1.0".PHP_EOL;
    $headers .= "Content-Type: multipart/mixed;".PHP_EOL;
    $headers .= " boundary=\"boundary_sdfsfsdfs345345sfsgs\"";
    mail($emailTo, $subject, $sendMessage, $headers);
    }

    echo json_encode($array);

}   else {
        header ('location: index.html#contact');
}

?>

这里是 jQuery：

// Contact form 
$('.contact-form form').submit(function(e) {
    e.preventDefault();

    var form = $(this);
    var nameLabel = form.find('label[for="contact-name"]');
    var emailLabel = form.find('label[for="contact-email"]');
    var numberLabel = form.find('label[for="contact-number"]');
    var messageLabel = form.find('label[for="contact-message"]');

    nameLabel.html('Full name');
    emailLabel.html('Email');
    numberLabel.html('Contact number');
    messageLabel.html('Message');

    var postdata = form.serialize();

    $.ajax({
        type: 'POST',
        url: 'sendmail.php',
        data: postdata,
        dataType: 'json',
        success: function(json) {
            if(json.nameMessage !== '') {
                nameLabel.append(' - <span class="red error-label"> ' + json.nameMessage + '</span>');
            }
            if(json.emailMessage !== '') {
                emailLabel.append(' - <span class="red error-label"> ' + json.emailMessage + '</span>');
            }
            if(json.numberMessage !== '') {
                numberLabel.append(' - <span class="red error-label"> ' + json.numberMessage + '</span>');
            }
            if(json.messageMessage !== '') {
                messageLabel.append(' - <span class="red error-label"> ' + json.messageMessage + '</span>');
            }
            if(json.nameMessage === '' && json.emailMessage === '' && json.numberMessage === '' && json.messageMessage === '') {
                form.fadeOut('fast', function() {
                    form.parent('.contact-form').append('<h2 class="text-center"><span class="orange">Thanks for contacting us!</span> We will get back to you very soon.</h2>');
                });
            } 
        }
    });
});

Answer 1

我猜+ 需要是第一个字符（国际电话号码）？

那么应该这样做：

if (!preg_match('/^(\+?)+([0-9]{10,})$/', $number)) {
    $array['numberMessage'] = 'Please enter a valid contact number.'
}

加号是可选的。如果需要，只需删除表达式中加号后的?。

Answer 2

检查长度是否小于 10 或查看输入是否与过滤后的输入不同（+ 和数字已删除）。

<?php
function valid_tel($in) {
    $valid = true;
    if(strlen($in) < 10 || $in !== preg_replace('@[^0-9+]@','', $in)) {
        $valid = false;
    }

    return $valid;
}
var_dump(valid_tel(''));
var_dump(valid_tel('01234'));
var_dump(valid_tel('01234567890')); // 11 long
var_dump(valid_tel('+012345678')); // 10 inc +
var_dump(valid_tel('+0123456'));
var_dump(valid_tel('0123456xyz7890'));

输出：

boolean false
boolean false
boolean true
boolean true
boolean false
boolean false