数组为空,使用会话变量PHP

| 我在传递带有浮点值的数组时遇到问题。在另一个文件中为空。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; 
我仍然有问题。我想我使用POST错误。我有3个脚本。第一个获取条目,第二个获取数组,第三个获取使用jpgraph的带有数组的图形。
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
    
已邀请:
        
 $_SESSION[\'notas\'][] = ($row[\'grade\'] - 57.3)/12;     
    
        这将与按钮提交一起使用
 //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 $cant;
这将与会话一起使用
//file 1 
session_start();
//...
while ($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;
    
        在第一个文件中,您设置“ 5”数组,但是在第二个文件中,您使用“ 6”将其添加到会话变量中,然后分配给“ 5”。第二个文件中的计数为
0
,因为您不对第一个文件中生成的数组元素进行计数,而是对
POST
请求(存储在elements10ѭ数组中)传递的值之一进行计数。 总结:您创建了一个数组,但计算了另一个数组的元素。 根据您调用第二个文件的方式(它是否是另一个请求?它是否包含在第一个文件中?),您有以下选择: 答:(如果是不同的请求)将“ 5”变量分配给会话数组元素,如下所示:
// at the end of the first file:
$_SESSION[\'notas\'] = $notas;
然后在第二个文件中而不是从
$_POST[\'notas\']
读取,或者 B.(如果第二个文件包含在第一个文件中)使用与第一个文件相同的变量名(
$notas
)并分配它而不是
$_POST[\'notas\']
// in the second file, instead of \" $_SESSION[\'notas\'] = $_POST[\'notas\']; \"
$_SESSION[\'notas\'] = $notas;
    
        在将其发送到文件3的jgraph之前,我想对文件2中的查询结果进行一些计算。我仍然不知道为什么这部分不起作用: //文件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=$tmp>\";
echo \"<input type=submit name=enviar>\";
echo \"</form>\";
我决定评论部分“ calcular s y mui”,现在,我可以将数组传递给文件3了。 //文件3
function array_recibe($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\");
    

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