$_POST 使用 isset() 返回 false

我有一个使用此属性设置的表单： enctype="multipart/form-data" 并且当我跳转到 PHP 部分并通过 isset() 函数检查 $_POST 变量是否存在时，它们在完全检查后返回 false表格。不使用 enctype 属性时根本不会发生这种情况

在 Google 或 Stack Overflow 上都没有找到任何解决方案，所以决定自己发帖。

形式：

   <form action="../processingShit/register.php" method="post" enctype="multipart/form-data">
    <div class="row">
     <div id="obligatory_inputs" class="col s12">
       <div class="input-field col s6" id="fName_wrapper">
      <i class="material-icons prefix">account_circle</i>
      <input id="input-fName" value="something" name="fName" type="text" class="validate" maxlength="20">
      <label for="input-fName">Nombre</label>
    </div>
    <div class="input-field col s6" id="sName_wrapper">
      <i class="material-icons prefix">account_circle</i>
      <input id="input-sName" value="something" name="sName" type="text" class="validate" maxlength="20">
      <label for="input-sName">Apellido</label>
    </div>
    <div class="col s6 input_wrappers">
      <div class="input-field col s12" id="userName_wrapper">
        <i class="material-icons prefix">account_circle</i>
        <input type="text" id="input-userName" value="something" name="userName" class="validate">
        <label for="input-userName">Nombre de usuario</label>
      </div>
    </div>
    <div  class="col s6 input_wrappers">
      <div class="input-field col s12">
     <i class="material-icons prefix">email</i>
     <input id="input-email" value="something" name="email" type="email" class="validate">
     <label for="input-email">E-mail</label>
   </div>
    </div>
    <div class="col s6 input_wrappers">
      <div class="input-field col s12">
        <i class="material-icons prefix">lock</i>
        <input type="password" id="input-password" value="something" name="password" class="validate">
        <label for="input-password">Contraseña</label>
        <span id="security_label">Nivel de seguridad: <span id="security_show" style="color: grey;"><b><i>?</i></b></span> </span>
      </div>
    </div>
    <div class="col s6 input_wrappers">
      <div class="input-field col s12">
        <i class="material-icons prefix">lock</i>
        <input type="password" id="input-password2" value="something" name="password2" class="validate">
        <label for="input-password2">Repetir Contraseña</label>
        <span id="matchPW"></span>
      </div>
    </div>
  </div>
     <div id="opcional_inputs" class="col s12">
       <center><div style="width: 90% !important;">
         <div class="input-field col s12">
             <i class="material-icons prefix">mode_edit</i>
             <textarea id="prDesc_ta" value="something" name="prDesc" class="materialize-textarea" maxlength="150"></textarea>
             <label for="prDesc_ta">Descripción de perfil</label>
           </div>
           <br>
           <br>
       <div class="input-field file-field">
         <div class="btn grey darken-4">
           <span>Archivo</span>
           <input type="file" value="something" name="prPic">
         </div>
         <div class="file-path-wrapper">
           <input class="file-path" type="text" placeholder="Imagen de perfil">
         </div>
       </div>
       <div class="input-field file-field">
         <div class="btn grey darken-4">
           <span>Archivo</span>
           <input type="file" value="something" name="prPort">
         </div>
         <div class="file-path-wrapper">
           <input class="file-path" type="text" placeholder="Portada de Perfil">
         </div>
       </div>
     </div></center>
     </div >
     <center>
     <button id="sendFormBTN" class=" grey darken-4" type="submit">
       REGISTRARSE
     </button>
     </center>
   </div>
 </form>

注册.php :

  <?php
       //returns false   
 if (isset($_POST["fName"]) &&
     isset($_POST["sName"])  &&
     isset($_POST["userName"])  &&
     isset($_POST["email"])  &&
     isset($_POST["password"])  &&
     isset($_POST["password2"])  &&
     isset($_POST["prDesc"])  &&
     isset($_POST["prPic"])  &&
     isset($_POST["prPort"])
       ) {

          //my code

}

    ?>

顺便说一下，有些代码是西班牙语的，它不应该影响您对它的理解。

感谢您的耐心：\