php - 如何拆分 if else 错误条件

Question

我使用一些 if/else 语句进行了验证。

<?php
if (isset($_POST["join"])) { 

  if ($userpoint < $lessonpoint) { //pt
    echo "you need more points";
  } //pt

  else { //has enough point


      if ($row['num'] > 0) { //check if user took this lesson
        echo "you took this lesson before.";
      } //check if user took this lesson ends


    else { //then let him apply to database

            //define post:
            $postvalue = (int)$_POST["postvalue"];

            //and check
            if($postvalue == '' || $postvalue <= 0 || $postvalue > $minimumpostvalue || $postvalue == is_int($postvalue)) { //check post
            echo "Error."; 

            } //checkpost ends.


      else { //insert

      $sql = "INSERT into etc... VALUES (?, ?, ?)";

            if($sql){ //to another database

                $artibir = "UPDATE etc.";

                echo "Done.";

            } // to another database
      }//insert
    } //let him apply
  } //has enough point
} //if post isset join
?>

这非常有效。

但我想针对这种情况回显另一条错误消息:$postvalue > $minimumpostvalue

在尝试时，我迷失在 if/else 语句中。无论我在哪里放置新语句，我都会遇到错误。

所有变量均已定义。

在哪里以及如何放置 $postvalue > $minimumpostvalue 来回显不同的错误消息？

Answer 1

<?php
if (isset($_POST["join"])) {

   if ($userpoint < $lessonpoint) { //pt
     echo "you need more points";
   } //pt

    else { //has enough point

         if ($row['num'] > 0) { //check if user took this lesson
             echo "you took this lesson before.";
         } //check if user took this lesson ends

        else { //then let him apply to database

             //define post:
             $postvalue = (int) $_POST["postvalue"];

             //and check
                  if ($postvalue == '' || $postvalue <= 0 || $postvalue > $minimumpostvalue || $postvalue == is_int($postvalue)) { //check post
                        if ($postvalue > $minimumpostvalue) {
                            echo "Another Error.";
                         } 
                        else {
                           echo "Error.";
                         }

                   } //checkpost ends.

                  else { //insert

                       $sql = "INSERT into etc... VALUES (?, ?, ?)";

                       if ($sql) { //to another database

                           $artibir = "UPDATE etc.";

                           echo "Done.";

                       } // to another database
                  } //insert
              } //let him apply
     } //has enough point
} //if post isset join
?>