PHP textarea问题，$ _ POST返回空数组

Question

我已经阅读了很多关于我的问题的google结果，任何方法都无法帮助我。 #define _GNU_SOURCE #include <pthread.h> #include <sched.h> #include <stdio.h> #include <errno.h> #include <string.h> #include <unistd.h> #include <semaphore.h> sem_t sem; void *start1(void *p) { pthread_mutex_lock(p); sem_post(&sem); sem_post(&sem); usleep(100000); pthread_mutex_unlock(p); return 0; } void *start2(void *p) { sem_wait(&sem); time_t t0 = time(0); while (pthread_mutex_trylock(p)) { if (time(0)>t0+5) return 0; } pthread_mutex_unlock(p); return 0; } void *start3(void *p) { sem_wait(&sem); struct timespec ts; clock_gettime(CLOCK_REALTIME, &ts); ts.tv_sec += 5; int r; if (r=pthread_mutex_timedlock(p, &ts)) { printf("failed: %d %s\n", r, strerror(r)); } else { pthread_mutex_unlock(p); } return 0; } int main(int argc, char **argv) { int policy = argc>1 ? SCHED_IDLE : SCHED_FIFO; int a = sched_get_priority_min(policy); pthread_attr_t attr; pthread_t t1,t2,t3; struct sched_param param = {0}; cpu_set_t set = {0}; CPU_ZERO(&set); CPU_SET(0, &set); pthread_setaffinity_np(pthread_self(), sizeof set, &set); pthread_attr_init(&attr); pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED); pthread_attr_setschedpolicy(&attr, policy); pthread_mutexattr_t ma; pthread_mutexattr_init(&ma); pthread_mutexattr_setprotocol(&ma, PTHREAD_PRIO_INHERIT); pthread_mutexattr_settype(&ma, PTHREAD_MUTEX_ERRORCHECK); pthread_mutex_t mtx; pthread_mutex_init(&mtx, &ma); sem_init(&sem, 0, 0); param.sched_priority = a+1; pthread_attr_setschedparam(&attr, &param); if (pthread_create(&t2, policy==SCHED_IDLE ? 0 : &attr, start2, &mtx)) return 1; param.sched_priority = a+2; pthread_attr_setschedparam(&attr, &param); if (pthread_create(&t3, policy==SCHED_IDLE ? 0 : &attr, start3, &mtx)) return 1; param.sched_priority = a; pthread_attr_setschedparam(&attr, &param); if (pthread_create(&t1, &attr, start1, &mtx)) return 1; pthread_join(t1, 0); pthread_join(t2, 0); pthread_join(t3, 0); return 0; } 返回了一个空数组，我尝试修复了两天。我曾经尝试过很多方法，无论是stackoverlow还是其他网站，都无法使用这种方法。 print_r($_POST)是空数组。

我的代码

$_POST

我的文本区域

<?php
require_once 'config.php';

function test_input($data) {
  $data = trim($data);
  $data = stripslashes($data);
  $data = htmlspecialchars($data);
  return $data;
}

function updateRec($tbl, $index) {
    if($GLOBALS['connection'] !== null) {
        $connection = $GLOBALS['connection'];

        if($tbl == 'users') {

            //if(isset($_POST['id']) && isset($_POST['username']) && isset($_POST['password']) && isset($_POST['rank'])) {
                $id = $_POST['id'];
                $login = test_input($_POST['username']);
                $pass = password_hash(test_input($_POST['password']), PASSWORD_DEFAULT);
                $rank = test_input($_POST['rank']);
                $q = "UPDATE $tbl SET id='$id', username='$login', password='$pass', rank='$rank' WHERE id='$index'";
                echo "<script type='text/javascript'>alert(".$login.");</script>";
            //}
        }

        //mysqli_query($connection, $q);
        header('location: '.$tbl.'.php?page=1');
    }
}

function createForm($a) {   
    if ($a === 'edit') {
        echo "<center><div id='editForm'>";
        $q = "DESCRIBE ".$_GET['tbl']."";
        $qr = mysqli_query($GLOBALS['connection'], $q);
        while ($rw = mysqli_fetch_array($qr)) {
            echo "<tr>";
            echo "<td> " . $rw['Field'] . "</td><br/>";
            echo "<td><textarea rows='4' cols='50' name='".$rw['Field']."' required></textarea></td>";
            echo "<br/>";
            echo "</tr>";
        }
        echo '<form action="forms.php?action=saveE&tbl='.$_GET['tbl'].'&row='.$_GET['row'].'" method="post" accept-charset="utf-8" style="transform: translate(5vw, -20vh); height: 0vh;">';
        echo '<button id="fButton" name="submit" style="">Zapisz</button></form>'. '<a href="'.$_GET['tbl'].'.php?page=1"><button id="fButton" style="transform: translate(5vw, 8vh); margin-left: 6%;">Anuluj</button></a>';
        print_r($_POST);
        echo "</div></center>";
    };
    if ($a === 'saveE') {
        updateRec($_GET['tbl'], $_GET['row']);
    };
}

?>

<!DOCTYPE html>
<html lang="pl">
<head>
    <title>Control Panel</title>
    <link rel="stylesheet" type="text/css" href="global.css">
    <meta charset="utf-8" name="viewport" content="width=device.width, initial-scale=1">
</head>
<body>
    <header>
        <p>Admin Control Panel</p>
    </header>


</body>
</html>

我也尝试使用id代替名称，但这对我没有帮助。