Где поставить код проверки правильности формы php

Question

Если я делаю проверку формы для ввода пользователем, я должен поставить phpcode на странице с формой справа?

Также в теге <form> я должен указать что угодно. Я имею в виду, если есть ошибка, пользователю придется вернуться на ту же страницу ввода с появлением ошибок. Если она была успешной вход, пользователь должен перейти порядка process.php

PHP Код подтверждения:

<?php 
$name = $_POST['name']; 
$nameregex = '/^[a-zA-Z]+\s?[a-zA-Z]+$/'; 
if (!preg_match($nameregex, $name)) { 
    echo '<font color=red>Please enter a valid name</font>'; 
} 
$email = $_POST['email']; 
$emailregex = '/^[a-zA-Z\_\-\.0-9]+\@[a-zA-Z\_\-\.0-9]+$/'; 
if (!preg_match($emailegex, $email)) { 
    echo '<font color="red">please Enter a valid email id</font>'; 
} 
$address = $_POST['address']; 
$addressregex = '/^[0-9a-zA-Z\,\s]+$/'; 
if (!preg_match($$addressregex, $address)) { 
    echo '<font color="red">please Enter a valid Address</font>'; 
} 
$state = $_POST['state']; 
$stateregex = '/^[a-zA-Z]+\s?[a-zA-Z]+$/'; 
if (!preg_match($stateregex, $state)) { 
    echo '<font color="red">please Enter a valid state name</font>'; 
} 
$pincode = $_POST['pincode']; 
$pincoderegex = '/^[a-zA-Z]+\s?[a-zA-Z]+$/'; 
if (!preg_match($pincoderegex, $pincode)) { 
    echo '<font color="red">please Enter a valid pincode</font>'; 
} 
?> 

HTML Форма Код:

<form name="orderform1" action="process-order.php" method="post" id="orderform"> 
      <ol> 
      <li> 
       <label for="name">Your Name:*</label> 
       <input id="name" name="name" class="text" /> 
      </li> 
      <li> 
       <label for="email">E-Mail:*</label> 
       <input id="email" name="email" class="text" /> 
      </li> 
      <li> 
       <label for="address1">Address Line 1:*</label> 
       <input id="address1" name="address1" class="text" /> 
      </li> 
      <li> 
       <label for="address2">Address Line 2:</label> 
       <input id="address2" name="address2" class="text" /> 
      </li> 
      <li> 
       <label for="state">State/Province*:</label> 
       <input id="state" name="state" class="text" /> 
      </li> 
      <li> 
       <label for="address">City:</label> 
       <input id="address" name="address" class="text" /> 
      </li> 
      <li> 
       <label for="pincode">Pin Code:*</label> 
       <input id="pincode" name="pincode" class="text" /> 
      </li> 
      <li> 
      <label for="country">Country:*</label> 
      <select name="country"> 
<option value="AF">Afghanistan</option> 
<option value="AX">Ã…Land Islands</option> 
<option value="AL">Albania</option> 
<option value="DZ">Algeria</option> 
<option value="AS">American Samoa</option> 
<option value="AD">Andorra</option> 
<option value="AO">Angola</option> 
<option value="AI">Anguilla</option> 
<option value="AQ">Antarctica</option> 
<option value="AG">Antigua And Barbuda</option> 
<option value="AR">Argentina</option> 
<option value="AM">Armenia</option> 
<option value="AW">Aruba</option> 
<option value="AU">Australia</option> 
<option value="AT">Austria</option> 
<option value="AZ">Azerbaijan</option> 
<option value="BS">Bahamas</option> 
<option value="BH">Bahrain</option> 
<option value="BD">Bangladesh</option> 
<option value="BB">Barbados</option> 
<option value="BY">Belarus</option> 
<option value="BE">Belgium</option> 
<option value="BZ">Belize</option> 
<option value="BJ">Benin</option> 
<option value="BM">Bermuda</option> 
<option value="BT">Bhutan</option> 
<option value="BO">Bolivia</option> 
<option value="BA">Bosnia And Herzegovina</option> 
<option value="BW">Botswana</option> 
<option value="BV">Bouvet Island</option> 
<option value="BR">Brazil</option> 
<option value="IO">British Indian Ocean Territory</option> 
<option value="BN">Brunei Darussalam</option> 
<option value="BG">Bulgaria</option> 
<option value="BF">Burkina Faso</option> 
<option value="BI">Burundi</option> 
<option value="KH">Cambodia</option> 
<option value="CM">Cameroon</option> 
<option value="CA">Canada</option> 
<option value="CV">Cape Verde</option> 
<option value="KY">Cayman Islands</option> 
<option value="CF">Central African Republic</option> 
<option value="TD">Chad</option> 
<option value="CL">Chile</option> 
<option value="CN">China</option> 
<option value="CX">Christmas Island</option> 
<option value="CC">Cocos (Keeling) Islands</option> 
<option value="CO">Colombia</option> 
<option value="KM">Comoros</option> 
<option value="CG">Congo</option> 
<option value="CD">Congo, The Democratic Republic Of The</option> 
<option value="CK">Cook Islands</option> 
<option value="CR">Costa Rica</option> 
<option value="CI">Cote D'Ivoire</option> 
<option value="HR">Croatia</option> 
<option value="CU">Cuba</option> 
<option value="CY">Cyprus</option> 
<option value="CZ">Czech Republic</option> 
<option value="DK">Denmark</option> 
<option value="DJ">Djibouti</option> 
<option value="DM">Dominica</option> 
<option value="DO">Dominican Republic</option> 
<option value="EC">Ecuador</option> 
<option value="EG">Egypt</option> 
<option value="SV">El Salvador</option> 
<option value="GQ">Equatorial Guinea</option> 
<option value="ER">Eritrea</option> 
<option value="EE">Estonia</option> 
<option value="ET">Ethiopia</option> 
<option value="FK">Falkland Islands (Malvinas)</option> 
<option value="FO">Faroe Islands</option> 
<option value="FJ">Fiji</option> 
<option value="FI">Finland</option> 
<option value="FR">France</option> 
<option value="GF">French Guiana</option> 
<option value="PF">French Polynesia</option> 
<option value="TF">French Southern Territories</option> 
<option value="GA">Gabon</option> 
<option value="GM">Gambia</option> 
<option value="GE">Georgia</option> 
<option value="DE">Germany</option> 
<option value="GH">Ghana</option> 
<option value="GI">Gibraltar</option> 
<option value="GR">Greece</option> 
<option value="GL">Greenland</option> 
<option value="GD">Grenada</option> 
<option value="GP">Guadeloupe</option> 
<option value="GU">Guam</option> 
<option value="GT">Guatemala</option> 
<option value=" Gg">Guernsey</option> 
<option value="GN">Guinea</option> 
<option value="GW">Guinea-Bissau</option> 
<option value="GY">Guyana</option> 
<option value="HT">Haiti</option> 
<option value="HM">Heard Island And Mcdonald Islands</option> 
<option value="VA">Holy See (Vatican City State)</option> 
<option value="HN">Honduras</option> 
<option value="HK">Hong Kong</option> 
<option value="HU">Hungary</option> 
<option value="IS">Iceland</option> 
<option value="IN">India</option> 
<option value="ID">Indonesia</option> 
<option value="IR">Iran, Islamic Republic Of</option> 
<option value="IQ">Iraq</option> 
<option value="IE">Ireland</option> 
<option value="IM">Isle Of Man</option> 
<option value="IL">Israel</option> 
<option value="IT">Italy</option> 
<option value="JM">Jamaica</option> 
<option value="JP">Japan</option> 
<option value="JE">Jersey</option> 
<option value="JO">Jordan</option> 
<option value="KZ">Kazakhstan</option> 
<option value="KE">Kenya</option> 
<option value="KI">Kiribati</option> 
<option value="KP">Korea, Democratic People'S Republic Of</option> 
<option value="KR">Korea, Republic Of</option> 
<option value="KW">Kuwait</option> 
<option value="KG">Kyrgyzstan</option> 
<option value="LA">Lao People'S Democratic Republic</option> 
<option value="LV">Latvia</option> 
<option value="LB">Lebanon</option> 
<option value="LS">Lesotho</option> 
<option value="LR">Liberia</option> 
<option value="LY">Libyan Arab Jamahiriya</option> 
<option value="LI">Liechtenstein</option> 
<option value="LT">Lithuania</option> 
<option value="LU">Luxembourg</option> 
<option value="MO">Macao</option> 
<option value="MK">Macedonia, The Former Yugoslav Republic Of</option> 
<option value="MG">Madagascar</option> 
<option value="MW">Malawi</option> 
<option value="MY">Malaysia</option> 
<option value="MV">Maldives</option> 
<option value="ML">Mali</option> 
<option value="MT">Malta</option> 
<option value="MH">Marshall Islands</option> 
<option value="MQ">Martinique</option> 
<option value="MR">Mauritania</option> 
<option value="MU">Mauritius</option> 
<option value="YT">Mayotte</option> 
<option value="MX">Mexico</option> 
<option value="FM">Micronesia, Federated States Of</option> 
<option value="MD">Moldova, Republic Of</option> 
<option value="MC">Monaco</option> 
<option value="MN">Mongolia</option> 
<option value="MS">Montserrat</option> 
<option value="MA">Morocco</option> 
<option value="MZ">Mozambique</option> 
<option value="MM">Myanmar</option> 
<option value="NA">Namibia</option> 
<option value="NR">Nauru</option> 
<option value="NP">Nepal</option> 
<option value="NL">Netherlands</option> 
<option value="AN">Netherlands Antilles</option> 
<option value="NC">New Caledonia</option> 
<option value="NZ">New Zealand</option> 
<option value="NI">Nicaragua</option> 
<option value="NE">Niger</option> 
<option value="NG">Nigeria</option> 
<option value="NU">Niue</option> 
<option value="NF">Norfolk Island</option> 
<option value="MP">Northern Mariana Islands</option> 
<option value="NO">Norway</option> 
<option value="OM">Oman</option> 
<option value="PK">Pakistan</option> 
<option value="PW">Palau</option> 
<option value="PS">Palestinian Territory, Occupied</option> 
<option value="PA">Panama</option> 
<option value="PG">Papua New Guinea</option> 
<option value="PY">Paraguay</option> 
<option value="PE">Peru</option> 
<option value="PH">Philippines</option> 
<option value="PN">Pitcairn</option> 
<option value="PL">Poland</option> 
<option value="PT">Portugal</option> 
<option value="PR">Puerto Rico</option> 
<option value="QA">Qatar</option> 
<option value="RE">Reunion</option> 
<option value="RO">Romania</option> 
<option value="RU">Russian Federation</option> 
<option value="RW">Rwanda</option> 
<option value="SH">Saint Helena</option> 
<option value="KN">Saint Kitts And Nevis</option> 
<option value="LC">Saint Lucia</option> 
<option value="PM">Saint Pierre And Miquelon</option> 
<option value="VC">Saint Vincent And The Grenadines</option> 
<option value="WS">Samoa</option> 
<option value="SM">San Marino</option> 
<option value="ST">Sao Tome And Principe</option> 
<option value="SA">Saudi Arabia</option> 
<option value="SN">Senegal</option> 
<option value="CS">Serbia And Montenegro</option> 
<option value="SC">Seychelles</option> 
<option value="SL">Sierra Leone</option> 
<option value="SG">Singapore</option> 
<option value="SK">Slovakia</option> 
<option value="SI">Slovenia</option> 
<option value="SB">Solomon Islands</option> 
<option value="SO">Somalia</option> 
<option value="ZA">South Africa</option> 
<option value="GS">South Georgia And The South Sandwich Islands</option> 
<option value="ES">Spain</option> 
<option value="LK">Sri Lanka</option> 
<option value="SD">Sudan</option> 
<option value="SR">Suriname</option> 
<option value="SJ">Svalbard And Jan Mayen</option> 
<option value="SZ">Swaziland</option> 
<option value="SE">Sweden</option> 
<option value="CH">Switzerland</option> 
<option value="SY">Syrian Arab Republic</option> 
<option value="TW">Taiwan, Province Of China</option> 
<option value="TJ">Tajikistan</option> 
<option value="TZ">Tanzania, United Republic Of</option> 
<option value="TH">Thailand</option> 
<option value="TL">Timor-Leste</option> 
<option value="TG">Togo</option> 
<option value="TK">Tokelau</option> 
<option value="TO">Tonga</option> 
<option value="TT">Trinidad And Tobago</option> 
<option value="TN">Tunisia</option> 
<option value="TR">Turkey</option> 
<option value="TM">Turkmenistan</option> 
<option value="TC">Turks And Caicos Islands</option> 
<option value="TV">Tuvalu</option> 
<option value="UG">Uganda</option> 
<option value="UA">Ukraine</option> 
<option value="AE">United Arab Emirates</option> 
<option value="GB">United Kingdom</option> 
<option value="US">United States</option> 
<option value="UM">United States Minor Outlying Islands</option> 
<option value="UY">Uruguay</option> 
<option value="UZ">Uzbekistan</option> 
<option value="VU">Vanuatu</option> 
<option value="VE">Venezuela</option> 
<option value="VN">Viet Nam</option> 
<option value="VG">Virgin Islands, British</option> 
<option value="VI">Virgin Islands, U.S.</option> 
<option value="WF">Wallis And Futuna</option> 
<option value="EH">Western Sahara</option> 
<option value="YE">Yemen</option> 
<option value="ZM">Zambia</option> 
<option value="ZW">Zimbabwe</option> 
</select> 
      <li> 
       <label for="phone">Phone Number(With Country Code):*</label> 
       <input id="phone" name="phone" class="text" /> 
      </li> 
      <li class="buttons"> 
       <input type="submit" name="imageField" id="imageField" value="Proceed to Payment" class="send" /> 
       <div class="clr"></div> 
      </li> 
      </ol> 
     </form> 

Answer 1

Вы должны поставить php-код (для проверки) в 'process-order.php'. Он получит данные формы.

Answer 2

Он перейдет к ДЕЙСТВИЮ формы (которая является процессом-order.php).

Если валидация не удалась, пользователь должен будет вернуться на страницу формы, и все будет пустым.

Чтобы иметь все поля формы предварительно заполняются снова, так что все это не пустая, то вы можете сделать, например

<input id="pincode" name="pincode" class="text" /> 

изменения

<input id="pincode" name="pincode" class="text" value='<?php echo (isset($_POST['pincode'])) ? $_POST['pincode'] : '' ?>' /> 

Answer 3

Вы можете перенаправлять на ту же страницу (т.е. форма заказа) и выберите отображение различных HTML-содержимого в зависимости от результата проверки:

<?php 
    // Validation routine here -- you can count the number of validation errors and use this as decision whether to show the form again or not 
    if ($_POST['submit']) { 

    $errorCount = 0; 

    // Validations here + count errors 


    } 
    // -- end of validation routine 

    if ($errorCount == 0) { ?> 

    <h1>Order Processed</h1> 
    <p>Your order was processed...</p> 

    <?php } 
    // If error count is above zero OR the submit button was never pressed, display form: 
    else { ?> 

    <form>...</form> 

    <?php } ?>