如何简化我的国家选择菜单PHP / mysql

Question

我有一个显示国家/地区的选择菜单。它查看数据库，并通过数据库中的值判断选项显示为选中状态。有没有比这更简单的方法：

if ($country == 'AG') {echo '<option value="AG" selected="selected">Antigua</option>';} 
else {echo '<option value="AG">Antigua</option>';};

if ($country == 'AR') {echo '<option value="AR" selected="selected">Argentina</option>';} 
else {echo '<option value="AR">Argentina</option>';};

if ($country == 'AM') {echo '<option value="AM" selected="selected">Armenia</option>';} 
else {echo '<option value="AM">Armenia</option>';};

if ($country == 'AW') {echo '<option value="AW" selected="selected">Aruba</option>';} 
else {echo '<option value="AW">Aruba</option>';};

if ($country == 'AU') {echo '<option value="AU" selected="selected">Australia</option>';} 
else {echo '<option value="AU">Australia</option >';};

if ($country == 'AT') {echo '<option value="AT" selected="selected">Austria</option>';} 
else {echo '<option value="AT">Austria</option>';};

if ($country == 'AZ') {echo '<option value="AZ" selected="selected">Azerbaijan</option>';} 
else {echo '<option value="AZ">Azerbaijan</option>';};

if ($country == 'BS') {echo '<option value="BS" selected="selected">Bahamas</option>';} 
else {echo '<option value="BS">Bahamas</option>';};

if ($country == 'BH') {echo '<option value="BH" selected="selected">Bahrain</option>';} 
else {echo '<option value="BH">Bahrain</option>';};

有很多国家，这样做会是疯狂的不是吗????

Answer 1

是的，请阅读DRY principle。遍历您的国家/地区结果集并检查循环内部是否选择了该国家/地区，如下所示：

$selected_value = 'AG'; // set to stored preference or something
foreach ($countries as $code => $country) {
  echo '<option value="' . htmlspecialchars($code) . '"';
  if ($code == $selected_value) {
    echo ' selected="selected"';
  }
  echo '>' . htmlspecialchars($country) . '</option>';
} 

Answer 2

也许这样的事情会起作用：

$myCountry = "PL";

foreach ($countries as $country) {
  echo '<option value = "'BH'"'

  if ($country == $myCountry) {echo ' selected="selected"';}

  echo '>Bahrain</option>';
}

$countries是包含所有国家/地区数据的数组或记录集。

取决于$countries的类型，您必须使用$countries中的数据替换上面示例中的巴林数据。

Answer 3

每当你有很多代码时，它几乎都是相同的，它是使用循环或函数而不是重写数千行代码的标志。

正如Michael B.注意到的方法是使用一个数组和一个简单的循环来显示这个列表并将正确的元素标记为选中。

$countries = array(
     'us' => 'United States of America',
     'de' => 'Germany',
     'pl' => 'Poland',
     'fr' => 'France',
     ...
);

foreach ($countires as $code => $name) {
    echo '<option value="' . $code . '" ' . ($country == $code ? 'selected="selected"' : null) . '>' . $name . '</option>';
}

Answer 4

类似的东西：

$countries = array('AG' => 'Antigua', 'AR' => 'Argentina', ...);

foreach($countries as $code => $name) {
    $selected =  ($country == $code) ? 'selected="selected"' : '';
    echo '<option value="' . $code . '"' . $selected . ' >' . $name . '</option>';
}

Answer 5

让$countries成为数据库中的国家/地区数组。让指定的国家/地区值在变量$country

中

foreach($countries as $value)
{
    if($country == $value['code'])
       echo '<option value="' . $value['code'] .'" selected="selected">'. $value['name'] . '</option';
    else
       echo '<option value="' . $value['code'] . '">' . $value['name'] . '</option>';
}

Answer 6

                <?php if($country=" ") { ?>
                  <option value="">Select Country</option>
                  <?php } else { ?>
                  <option value=""><?php echo $country; ?></option>
                <?php } ?>

                <option value="Afghanistan">Afghanistan</option>
                <option value="Albania">Albania</option>
                <option value="Algeria">Algeria</option>
                <option value="American Samoa">American Samoa</option>
                <option value="Andorra">Andorra</option>
                <option value="Angola">Angola</option>
                <option value="Anguilla">Anguilla</option>
                <option value="Antigua &amp; Barbuda">Antigua &amp; Barbuda</option>
                <option value="Argentina">Argentina</option>
                <option value="Armenia">Armenia</option>
                <option value="Aruba">Aruba</option>
                <option value="Australia">Australia</option>
                <option value="Austria">Austria</option>
                <option value="Azerbaijan">Azerbaijan</option>
                <option value="Bahamas">Bahamas</option>
                <option value="Bahrain">Bahrain</option>
                <option value="Bangladesh">Bangladesh</option>
                <option value="Barbados">Barbados</option>
                <option value="Belarus">Belarus</option>
                <option value="Belgium">Belgium</option>
                <option value="Belize">Belize</option>
                <option value="Benin">Benin</option>
                <option value="Bermuda">Bermuda</option>
                <option value="Bhutan">Bhutan</option>
                <option value="Bolivia">Bolivia</option>
                <option value="Bonaire">Bonaire</option>
                <option value="Bosnia &amp; Herzegovina">Bosnia &amp; Herzegovina</option>
                <option value="Botswana">Botswana</option>
                <option value="Brazil">Brazil</option>
                <option value="British Indian Ocean Ter">British Indian Ocean Ter</option>
                <option value="Brunei">Brunei</option>
                <option value="Bulgaria">Bulgaria</option>
                <option value="Burkina Faso">Burkina Faso</option>
                <option value="Burundi">Burundi</option>
                <option value="Cambodia">Cambodia</option>
                <option value="Cameroon">Cameroon</option>
                <option value="Canada">Canada</option>
                <option value="Canary Islands">Canary Islands</option>
                <option value="Cape Verde">Cape Verde</option>
                <option value="Cayman Islands">Cayman Islands</option>
                <option value="Central African Republic">Central African Republic</option>
                <option value="Chad">Chad</option>
                <option value="Channel Islands">Channel Islands</option>
                <option value="Chile">Chile</option>
                <option value="China">China</option>
                <option value="Christmas Island">Christmas Island</option>
                <option value="Cocos Island">Cocos Island</option>
                <option value="Colombia">Colombia</option>
                <option value="Comoros">Comoros</option>
                <option value="Congo">Congo</option>
                <option value="Cook Islands">Cook Islands</option>
                <option value="Costa Rica">Costa Rica</option>
                <option value="Cote D'Ivoire">Cote D'Ivoire</option>
                <option value="Croatia">Croatia</option>
                <option value="Cuba">Cuba</option>
                <option value="Curacao">Curacao</option>
                <option value="Cyprus">Cyprus</option>
                <option value="Czech Republic">Czech Republic</option>
                <option value="Denmark">Denmark</option>
                <option value="Djibouti">Djibouti</option>
                <option value="Dominica">Dominica</option>
                <option value="Dominican Republic">Dominican Republic</option>
                <option value="East Timor">East Timor</option>
                <option value="Ecuador">Ecuador</option>
                <option value="Egypt">Egypt</option>
                <option value="El Salvador">El Salvador</option>
                <option value="Equatorial Guinea">Equatorial Guinea</option>
                <option value="Eritrea">Eritrea</option>
                <option value="Estonia">Estonia</option>
                <option value="Ethiopia">Ethiopia</option>
                <option value="Falkland Islands">Falkland Islands</option>
                <option value="Faroe Islands">Faroe Islands</option>
                <option value="Fiji">Fiji</option>
                <option value="Finland">Finland</option>
                <option value="France">France</option>
                <option value="French Guiana">French Guiana</option>
                <option value="French Polynesia">French Polynesia</option>
                <option value="French Southern Ter">French Southern Ter</option>
                <option value="Gabon">Gabon</option>
                <option value="Gambia">Gambia</option>
                <option value="Georgia">Georgia</option>
                <option value="Germany">Germany</option>
                <option value="Ghana">Ghana</option>
                <option value="Gibraltar">Gibraltar</option>
                <option value="Great Britain">Great Britain</option>
                <option value="Greece">Greece</option>
                <option value="Greenland">Greenland</option>
                <option value="Grenada">Grenada</option>
                <option value="Guadeloupe">Guadeloupe</option>
                <option value="Guam">Guam</option>
                <option value="Guatemala">Guatemala</option>
                <option value="Guinea">Guinea</option>
                <option value="Guyana">Guyana</option>
                <option value="Haiti">Haiti</option>
                <option value="Hawaii">Hawaii</option>
                <option value="Honduras">Honduras</option>
                <option value="Hong Kong">Hong Kong</option>
                <option value="Hungary">Hungary</option>
                <option value="Iceland">Iceland</option>
                <option value="India">India</option>
                <option value="Indonesia">Indonesia</option>
                <option value="Iran">Iran</option>
                <option value="Iraq">Iraq</option>
                <option value="Ireland">Ireland</option>
                <option value="Isle of Man">Isle of Man</option>
                <option value="Israel">Israel</option>
                <option value="Italy">Italy</option>
                <option value="Jamaica">Jamaica</option>
                <option value="Japan">Japan</option>
                <option value="Jordan">Jordan</option>
                <option value="Kazakhstan">Kazakhstan</option>
                <option value="Kenya">Kenya</option>
                <option value="Kiribati">Kiribati</option>
                <option value="Korea North">Korea North</option>
                <option value="Korea South">Korea South</option>
                <option value="Kuwait">Kuwait</option>
                <option value="Kyrgyzstan">Kyrgyzstan</option>
                <option value="Laos">Laos</option>
                <option value="Latvia">Latvia</option>
                <option value="Lebanon">Lebanon</option>
                <option value="Lesotho">Lesotho</option>
                <option value="Liberia">Liberia</option>
                <option value="Libya">Libya</option>
                <option value="Liechtenstein">Liechtenstein</option>
                <option value="Lithuania">Lithuania</option>
                <option value="Luxembourg">Luxembourg</option>
                <option value="Macau">Macau</option>
                <option value="Macedonia">Macedonia</option>
                <option value="Madagascar">Madagascar</option>
                <option value="Malaysia">Malaysia</option>
                <option value="Malawi">Malawi</option>
                <option value="Maldives">Maldives</option>
                <option value="Mali">Mali</option>
                <option value="Malta">Malta</option>
                <option value="Marshall Islands">Marshall Islands</option>
                <option value="Martinique">Martinique</option>
                <option value="Mauritania">Mauritania</option>
                <option value="Mauritius">Mauritius</option>
                <option value="Mayotte">Mayotte</option>
                <option value="Mexico">Mexico</option>
                <option value="Midway Islands">Midway Islands</option>
                <option value="Moldova">Moldova</option>
                <option value="Monaco">Monaco</option>
                <option value="Mongolia">Mongolia</option>
                <option value="Montserrat">Montserrat</option>
                <option value="Morocco">Morocco</option>
                <option value="Mozambique">Mozambique</option>
                <option value="Myanmar">Myanmar</option>
                <option value="Nambia">Nambia</option>
                <option value="Nauru">Nauru</option>
                <option value="Nepal">Nepal</option>
                <option value="Netherland Antilles">Netherland Antilles</option>
                <option value="Netherlands (Holland, Europe)">Netherlands (Holland, Europe)</option>
                <option value="Nevis">Nevis</option>
                <option value="New Caledonia">New Caledonia</option>
                <option value="New Zealand">New Zealand</option>
                <option value="Nicaragua">Nicaragua</option>
                <option value="Niger">Niger</option>
                <option value="Nigeria">Nigeria</option>
                <option value="Niue">Niue</option>
                <option value="Norfolk Island">Norfolk Island</option>
                <option value="Norway">Norway</option>
                <option value="Oman">Oman</option>
                <option value="Pakistan">Pakistan</option>
                <option value="Palau Island">Palau Island</option>
                <option value="Palestine">Palestine</option>
                <option value="Panama">Panama</option>
                <option value="Papua New Guinea">Papua New Guinea</option>
                <option value="Paraguay">Paraguay</option>
                <option value="Peru">Peru</option>
                <option value="Philippines">Philippines</option>
                <option value="Pitcairn Island">Pitcairn Island</option>
                <option value="Poland">Poland</option>
                <option value="Portugal">Portugal</option>
                <option value="Puerto Rico">Puerto Rico</option>
                <option value="Qatar">Qatar</option>
                <option value="Republic of Montenegro">Republic of Montenegro</option>
                <option value="Republic of Serbia">Republic of Serbia</option>
                <option value="Reunion">Reunion</option>
                <option value="Romania">Romania</option>
                <option value="Russia">Russia</option>
                <option value="Rwanda">Rwanda</option>
                <option value="St Barthelemy">St Barthelemy</option>
                <option value="St Eustatius">St Eustatius</option>
                <option value="St Helena">St Helena</option>
                <option value="St Kitts-Nevis">St Kitts-Nevis</option>
                <option value="St Lucia">St Lucia</option>
                <option value="St Maarten">St Maarten</option>
                <option value="St Pierre &amp; Miquelon">St Pierre &amp; Miquelon</option>
                <option value="St Vincent &amp; Grenadines">St Vincent &amp; Grenadines</option>
                <option value="Saipan">Saipan</option>
                <option value="Samoa">Samoa</option>
                <option value="Samoa American">Samoa American</option>
                <option value="San Marino">San Marino</option>
                <option value="Sao Tome &amp; Principe">Sao Tome &amp; Principe</option>
                <option value="Saudi Arabia">Saudi Arabia</option>
                <option value="Senegal">Senegal</option>
                <option value="Seychelles">Seychelles</option>
                <option value="Sierra Leone">Sierra Leone</option>
                <option value="Singapore">Singapore</option>
                <option value="Slovakia">Slovakia</option>
                <option value="Slovenia">Slovenia</option>
                <option value="Solomon Islands">Solomon Islands</option>
                <option value="Somalia">Somalia</option>
                <option value="South Africa">South Africa</option>
                <option value="Spain">Spain</option>
                <option value="Sri Lanka">Sri Lanka</option>
                <option value="Sudan">Sudan</option>
                <option value="Suriname">Suriname</option>
                <option value="Swaziland">Swaziland</option>
                <option value="Sweden">Sweden</option>
                <option value="Switzerland">Switzerland</option>
                <option value="Syria">Syria</option>
                <option value="Tahiti">Tahiti</option>
                <option value="Taiwan">Taiwan</option>
                <option value="Tajikistan">Tajikistan</option>
                <option value="Tanzania">Tanzania</option>
                <option value="Thailand">Thailand</option>
                <option value="Togo">Togo</option>
                <option value="Tokelau">Tokelau</option>
                <option value="Tonga">Tonga</option>
                <option value="Trinidad &amp; Tobago">Trinidad &amp; Tobago</option>
                <option value="Tunisia">Tunisia</option>
                <option value="Turkey">Turkey</option>
                <option value="Turkmenistan">Turkmenistan</option>
                <option value="Turks &amp; Caicos Is">Turks &amp; Caicos Is</option>
                <option value="Tuvalu">Tuvalu</option>
                <option value="Uganda">Uganda</option>
                <option value="Ukraine">Ukraine</option>
                <option value="United Arab Emirates">United Arab Emirates</option>
                <option value="United Kingdom">United Kingdom</option>
                <option value="United States of America">United States of America</option>
                <option value="Uruguay">Uruguay</option>
                <option value="Uzbekistan">Uzbekistan</option>
                <option value="Vanuatu">Vanuatu</option>
                <option value="Vatican City State">Vatican City State</option>
                <option value="Venezuela">Venezuela</option>
                <option value="Vietnam">Vietnam</option>
                <option value="Virgin Islands (Brit)">Virgin Islands (Brit)</option>
                <option value="Virgin Islands (USA)">Virgin Islands (USA)</option>
                <option value="Wake Island">Wake Island</option>
                <option value="Wallis &amp; Futana Is">Wallis &amp; Futana Is</option>
                <option value="Yemen">Yemen</option>
                <option value="Zaire">Zaire</option>
                <option value="Zambia">Zambia</option>
                <option value="Zimbabwe">Zimbabwe</option>
                </select>