PHP传递参数以实现奇怪的行为

Question

I have this function in Utils.php

function GenerateMonthlyReport($connection, $month, $year, $objSheet)
 {     
     $months = array("Enero", "Febero", "Marzo", "Abril", "Mayo", "Junio" ,"Julio", "Agosto", "Septiembre", "Octubre", "Noviembre", "Diciembre");       
     $fromDate = $year . "-" . $month . "-01";
     $toDate = "";

   if ($month != 12)
    $toDate = $year . "-" . ($month+1) . "-01";
  else
   $toDate = ($year+1) . "-01-01";

 etc..
}

Then in another file createReport.php i call this function using $_POST parameters like this

 include "Utils.php";
 include "Connect.php";
 require_once('PHPExcel/Classes/PHPExcel.php');

 checkLogin();

 // Connect to Db
 $connection = openDb(); 

 // Input Data
 $month =  mysqli_real_escape_string($connection, $_POST["month"]);
 $year =  mysqli_real_escape_string($connection, $_POST["year"]);

 $objPHPExcel = CreateEmptyWorkbook();
 $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, "Excel2007"); // create the writer
 $objSheet = $objPHPExcel->getActiveSheet();

 GenerateMonthlyReport($connection, $month, $year, $objSheet);

Problem: the parameters $year and $month that i am passing to the function GenerateMonthlyReport are null inside the function.

But if i do something like this:

 GenerateMonthlyReport($connection, "3", "2013", $objSheet);

they are passed correctly.

If i do a echo of $year and $month variables, they display values!!

Also: This strange behaviour only happens when i submit the Form from a Mobile Device. It does not happen from a PC browser.

EDIT: here is the Form HTML code:

    <form id="reportForm" action="/service/createMonthlyReport.php"  method="post">
   <table border="1">
   <tr>
   <td>
     Seleccione Per&iacute;odo
   </td>
   <td>
      <label>Mes</label><br/>
       <select id="monthM" name="month" > 
             <?php for ($i=1; $i<=12; $i++) :?>
               <option value="<?php echo $i; ?>"   <?php echo date("n") != $i ? "" : "selected" ?>>
                 <?php echo $monthName = date("M", mktime(0, 0, 0, $i, 10)); ?>
               </option>          
             <?php endfor; ?>
            </select>
            </td>

        <td>
        <label>Anio</label><br/>
            <select id="yearM" name="year" > 
             <?php for ($i=-5; $i<=5; $i++) :?>
                 <?php $yearData = (date("Y") + $i); ?>
               <option value="<?php echo $yearData; ?>"  <?php echo date("Y") != $yearData ? "" : "selected" ?>>
                 <?php echo $yearData; ?>
               </option>
             <?php endfor; ?>
            </select>                   
        </td>
        <td>    

            <input type="submit" value="Descargar Reporte Mensual" id="submitBtn" class="crearBtn" />
            </td>
    </tr>
    </table>
   </form>

openDB code:

function openDb() {
 $sever = "myserver";
 $database_name = "dbname";
 $user = "user";
 $pass = "mypass";

 $connection = new mysqli($server, $user, $pass, $database_name) or die("DB connection failed!");;
 $connection->set_charset("utf8");
 mysqli_query($connection, 'SET NAMES utf8');
 mysqli_query($connection, 'SET CHARACTER SET utf8');

 return $connection;
}

Answer 1

Your DB encoding is UTF-8, but you avoid characters above 128 in your code by using HTML entities like í . I wonder if some ISO 8859-1 in your UTF-8 workflow could be breaking PHP or one of its extensions. Make sure you have the proper header() for UTF-8, and that everything (eg, hidden form variables) is properly UTF-8 encoded.

Anyway, a variable (two in your case) that is null when it shouldn't be, could be the result of a wrong reference count. References are the low level mechanism by which a variable's value is not copied when it is assigned to another variable, but both variables point to the same value, which has a reference count of 2 (or more). If, eg, the reference count is not incremented on assignment, but is decremented when a variable goes out of scope, it could become 0 when it should be 1, and the value is erroneously freed.

I think I have already seen a reference count bug. It could have been in a database extension (possibly the sybase extension, but I'm not sure). If so, it was probably in a *_fetch_*() function.

Try to take out pieces of your code. Try leaving out the DB calls (including checkLogin() , I guess), and/or the PHPExcel part, and/or others, before getting to the function where you have the problem ( GenerateMonthlyReport() ).

Check if you have PHP references ( & ) in your code. If so, try to do without them (they are not bad in themselves, but being complicated at the low level, they are more likely to trigger a bug of the above kind).

In order to rule out name collisions, try also the following: rename year and month to year0 and month0 in the form and in $_POST , $year and $month to $year1 and $month1 in the main, and $year and $month to $year2 and $month2 in GenerateMonthlyReport() .