PHP脚本仅在一个脚本上导致错误500，即使我评论所有内容

Question

I get everytime Error 500. I tried to comment everything but nothing won't help. Where could be the problem? I use a normal apache2 server on Ubuntu. Even if I write the beginning tag like

<?php
error_reporting(E_ALL);

mysql_connect("192.168.3.64", "root", "xxx");
mysql_select_db("vertretung");

function rollback_if_error() {
    if(mysql_error()) {
        mysql_query("ROLLBACK");
        die("error");
    }
}

mysql_query("START TRANSACTION");

$table_id = rand();

mysql_query("INSERT INTO tables (table_id, table_date, table_name) VALUES ($table_id, '".mysql_real_escape_string($_POST['table_date'])."', '".mysql_real_escape_string($_POST['table_name'])."')");
rollback_if_error();

$table_rows = explode("|", $_POST['table_data']);

$is_caption = true;

foreach($table_rows as $row) {
    $row_id = rand();

    mysql_query("INSERT INTO table_rows (row_id, table_id, is_caption) VALUES ($row_id, $table_id, ".$is_caption.")");
    rollback_if_error();

    $fields = explode(";", $row);

    foreach($row as $field) {
        mysql_query("INSERT INTO table_field (row_id, value) VALUES ($row_id, '".mysql_real_escape_string($field)."')");
        rollback_if_error();
    }

    $is_caption = false;
}

mysql_query("COMMIT");
?>

Answer 1

Generally error 500 occurred from server fault but sometime this issue came from php error not display. try this

ini_set("display_errors","On");
error_reporing(-1); // or E_ALL

put this lines on top of the code.