URL 매개 변수에 따라 선택 필드에서 옵션을 자동 선택하려면 어떻게합니까?

Question

아래 양식에서 URL 매개 변수의 값에 따라 다양한 옵션을 자동 선택하려면 어떻게해야합니까?

예 : http://example.com/?type=%28shirt%2C+tshirt%2C+t-shirt%29&length=25&width=17&expand=yes

 <form name="shirty" method="get"> 
      <select name="type" /> 
      <option value="(shirt, tshirt, t-shirt)">T-Shirt</option> 
      <option value="(hoodie, sweatshirt)">Sweatshirt</option> 
      </select> 

      <select name="length" /> 
      <option value="select">Select a length</option> 
      <option value="14">14 Inches</option> 
      <option value="15">15 Inches</option> 
      <option value="16">16 Inches</option> 
      <option value="17">17 Inches</option> 
      <option value="18">18 Inches</option> 
      <option value="19">19 Inches</option> 
      <option value="20">20 Inches</option> 

      </select> 


      <select name="width" /> 
      <option value="select">Select a Width</option> 
      <option value="14">14 Inches</option>     
      <option value="15">15 Inches</option> 
      <option value="16">16 Inches</option> 
      <option value="17">17 Inches</option> 
      <option value="18">18 Inches</option> 
      <option value="19">19 Inches</option> 
      <option value="20">20 Inches</option> 
      </select> 

      <input type="checkbox" name="expand" value="yes"" checked><small>include ± 1 inch?</small> 

      <input type="submit" name="Submit" value="Search" /> 

     </form> 

Answer 1

가있어.

 <form name="shirty" method="get"> 
      <select name="type" /> 
      <?php //create the select options 
       $options = " 
        <option value=\"(shirt, tshirt, t-shirt)\">T-Shirt</option> 
        <option value=\"(hoodie, sweatshirt)\">Sweatshirt</option>"; 
        $saved = $type; 
       $saved = (!empty($saved))? $saved: false; 
       if ($saved) 
        //if there is a saved data set the option to selected 
        $options = str_replace('value="'.$saved.'"','value="'.$saved.'" selected="selected"',$options); 
       //echo out the options 
       echo $options; ?> 
       ?> 
      </select> 


      <select name="length" /> 
      <?php //create the select options 
       $options = " 
        <option value=\"14\">14 Inches</option> 
        <option value=\"15\">15 Inches</option> 
        <option value=\"16\">16 Inches</option> 
        <option value=\"17\">17 Inches</option> 
        <option value=\"18\">18 Inches</option> 
        <option value=\"19\">19 Inches</option> 
        <option value=\"20\">20 Inches</option>"; 

        $saved = $length; 
       $saved = (!empty($saved))? $saved: false; 
       if ($saved) 
        //if there is a saved data set the option to selected 
        $options = str_replace('value="'.$saved.'"','value="'.$saved.'" selected="selected"',$options); 
       //echo out the options 
       echo $options; ?> 
       ?> 
      </select> 


      <select name="width" /> 
      <?php //create the select options 
       $options = " 
        <option value=\"14\">14 Inches</option> 
        <option value=\"15\">15 Inches</option> 
        <option value=\"16\">16 Inches</option> 
        <option value=\"17\">17 Inches</option> 
        <option value=\"18\">18 Inches</option> 
        <option value=\"19\">19 Inches</option> 
        <option value=\"20\">20 Inches</option>"; 
        $saved = $width; 
       $saved = (!empty($saved))? $saved: false; 
       if ($saved) 
        //if there is a saved data set the option to selected 
        $options = str_replace('value="'.$saved.'"','value="'.$saved.'" selected="selected"',$options); 
       //echo out the options 
       echo $options; ?> 
       ?> 
      </select> 

      <input type="checkbox" name="expand" value="yes"" checked><small>include ± 1 inch?</small> 

      <input type="submit" name="Submit" value="Search" /> 

      </form> 

Answer 2

<?php 
    //This example creates a select element and marks selected option using selected_id in URL 

     $attributesAssocArray = array(
      "id"=>"someId","class"=>"someClass" 
     ); 

     $optionsArray = array(
      0=>"choose...",1=>"one",2=>"two",3=>"three" 
     ); 

     $selectedId = (!empty($_GET['selected_id'])&&(is_numeric($_GET['selected_id'])))? intval($_GET['selected_id']):-1; 

     echo generate_select($attributesAssocArray,$optionsArray,$selectedId); 

     function generate_select($attributesAssocArray=array(),$optionsArray=array(),$selected=-1) 
     { 
      $attributes = generate_attributes($attributesAssocArray); 
      $html = '<select '.$attributes.'>'; 
      foreach ($optionsArray as $value => $name) 
      { 
       $isSelected = $value==$selected ? " selected" : ""; 
       $html.= '<option value="'.$value.'"'.$isSelected.'>'.$name.'</option>'; 
      } 
      $html.='</select>'; 
      return $html; 
     } 

     function generate_attributes($attributesAssocArray) 
     { 
      $attributes=''; 
      foreach ($attributesAssocArray as $name => $value) 
      { 
       $attributes.= $name.'="'.$value.'" '; 
      } 
      return $attributes; 
     } 
?>