使用会话变量PHP,数组为空

时间:2011-05-28 04:24:25

标签: php session-variables jpgraph

我在使用浮点值传递数组时遇到问题。在另一个文件中它是空的。这是代码。请任何帮助...

 //file 1 
session_start();
//...
while ($row = pg_fetch_assoc($sql))
{       
    $notas[$i] = ($row['grade'] - 57.3)/12;                 
    $i++;
}

print("<FORM method=post action='../indicadores/distr_notas.php'>");
print("<input type=hidden name=notas value='$notas'>");
print("<INPUT type=submit>");
print("</FORM>");

//file 2
session_start();

$_SESSION['notas'] = $_POST['notas'];
$notas = $_SESSION['notas'];


$cant = count($notas);
echo $cant; 

我还有问题。我想我错了。我有3个脚本。第一个获取条目,第二个获取数组,第三个使用jpgraph显示数组的图形。

file 1 // get the array
<?php  
    print("<FORM method=post action='proc_notas.php'>");
    print("Codigo de Carrera.<p>");
    print("<INPUT type=text name='cod_depto'><p>");
    print("<INPUT type=submit>");
    print("</FORM>");
 ?>


//file 2. 

if($_SERVER['REQUEST_METHOD'] != "POST")
{
print("<FORM method=post action='normal.php'>");
print("Desviación estándar.<p>");
print("<INPUT type=text name='desviacion'><p>");
print("<INPUT type=submit>");
print("</FORM>");
}
else
{
    $depto = $_REQUEST['cod_depto'];
    $ordenada = array();
    $z = array();
        $i = 0;
        $suma = 0;
    $conectar = new Conector();
    $cadena =  "select distinct a.grade FROM evaluation_student_evals a inner join td_estudiantes b on a.party_id = b.id_estudiante where b.cod_depto = '$depto' and a.grade >= 0 and a.grade <= 100 order by a.grade ";
    $sql = $conectar-> consultas($cadena);      
    //calcular sigma y miu      
    $total = pg_num_rows($sql);
    $sumanotas = new distribucion();
    $totalnotas = $sumanotas -> suma_notas($sql);
    $media = $totalnotas/$total;

//Normalizar datos de notas Z = (X-miu)/sigma
    while ($row = pg_fetch_assoc($sql))
    {       

        $ordenada[$i] = (1/(12*sqrt(pi())))*(exp(-0.5*(($row['grade']-$media)*($row['grade'] - $media))/($desviacion*$desviacion)));                                    
        $i++;   }               

    if (!isset($row))
    {
        header("Content-Type: text/html");
        print("<HTML><HEAD><TITLE>Desempeño de Aprendizaje</TITLE>");
        print("</HEAD>");
        print("<BODY>");
        print("$depto no se encuentra.");
        print("</BODY></HTML>");


//file 3 Graph the array
Here, I don´t know how to get the array $ordenada

4 个答案:

答案 0 :(得分:0)

这适用于按钮提交

 //file 1 
session_start();
//...
while ($row = pg_fetch_assoc($sql))
{       
    $notas[$i] = ($row['grade'] - 57.3)/12;                 
    $i++;
}

print("<FORM method=post action='../indicadores/distr_notas.php'>");
print("<input type=hidden name=notas value='".implode(',' $notas)."'>"); // use implode to convert array to string
print("<INPUT type=submit>");
print("</FORM>");

//file 2
session_start();

$notas = explode(',' $_POST['notas']);  // use explode to convert string to array

$cant = count($notas);
echo $cant;

这将适用于会话

//file 1 
session_start();
//...
while ($row = pg_fetch_assoc($sql))
{       
    $_SESSION['notas'][$i] = ($row['grade'] - 57.3)/12;                 
    $i++;
}

print("<FORM method=post action='../indicadores/distr_notas.php'>");
print("<input type=hidden name=notas value='$notas'>");  // no need to use
print("<INPUT type=submit>");
print("</FORM>");

//file 2
session_start();

$notas = $_SESSION['notas'];


$cant = count($notas);
echo $cant;

答案 1 :(得分:0)

 $_SESSION['notas'][] = ($row['grade'] - 57.3)/12;     

答案 2 :(得分:0)

在第一个文件中设置$notas数组,但在第二个文件中使用$_POST['notas']将其添加到会话变量,然后分配给$notas。第二个文件中的计数为0,因为您不计算第一个文件中生成的数组元素,而是计算POST请求传递的值之一的元素(存储在{ {1}}数组)。

总结:您创建了一个数组,但计算了不同数组的元素

根据您调用第二个文件的方式(是否是另一个请求?是否包含在第一个文件中?),您有以下选项:

一个。 (如果是不同的请求)将$_POST变量分配给会话数组元素,如:

$notas

并在第二个文件中从// at the end of the first file: $_SESSION['notas'] = $notas;

读取

B中。 (如果第一个文件中包含第二个文件)使用与第一个文件($_POST['notas'])中相同的变量名称并分配而不是$notas

$_POST['notas']

答案 3 :(得分:0)

我想在文件2中对查询结果进行一些计算,然后将它发送到文件3的jgraph。我仍然不知道为什么这部分不起作用:

// file 2

$depto = $_REQUEST['cod_depto'];
$desviacion = $_REQUEST['desviacion'];
$ordenada = array();
$i = 0;
$suma = 0;
$conectar = new Conector();
$cadena =  "select distinct a.grade FROM evaluation_student_evals a inner join td_estudiantes b on a.party_id = b.id_estudiante where b.cod_depto = '$depto' and a.grade >= 0 and a.grade <= 100 order by a.grade ";
$sql = $conectar-> consultas($cadena);      

//calcular sigma y miu          
$total = pg_num_rows($sql);
$sumanotas = new distribucion();
$totalnotas = $sumanotas -> suma_notas($sql);
$media = $totalnotas/$total;

//Normalizar datos de notas Z = (X-miu)/sigma
while ($row = pg_fetch_assoc($sql))
    {       
        $ordenada[$i] = (1/($desviacion*sqrt(pi())))*(exp(-0.5*(($row['grade']-$media)*($row['grade'] - $media))/($desviacion*$desviacion)));                                      $i++;
    }
$tmp= serialize($ordenada);
$tmp= urlencode($tmp);
echo "<form method=post action='../indicadores/distr_notas.php'>";
echo "<input type=hidden name=ordenada value=$tmp>";
echo "<input type=submit name=enviar>";
echo "</form>";

我决定评论部分“calcular sigma y mui”,现在,我可以将数组传递给文件3。

// file 3

function array_recibe($url_array) {
    $tmp = stripslashes($url_array);
    $tmp = urldecode($tmp);
    $tmp = unserialize($tmp);

   return $tmp;
} 

$notas =$_REQUEST['ordenada'];
$notas =array_recibe($notas);

//jpgraph code
$graph = new Graph(600,400,"auto");