网站上传后错误500（没有.htaccess，没有WP）[重复]

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• PHP parse/syntax errors; and how to solve them? 17 answers

I just went to upload the 1st version of a new project I built on the host. To be clear, everything were ready to start working but finally all I got was :

HTTP ERROR 500

I know what does this mean.

My project is 100% handmade with PHP, no WP or other CMS/platform, and there is no Apache file (.htaccess will be added later).
But there is a error_log file, which always have the same line :

[19-Jan-2017 12:59:06 America/Chicago]
PHP Parse error:  syntax error, unexpected '$sgbd' (T_VARIABLE)
in /path/to/the/file.php on line 1

It refers to my database connexion file :

<?php
$sgbd = "mysql";
$host = "localhost";
$database = "dont_worry";
$charset = "utf8";
$user = "this_is_not";
$password = "my_infos";
$options = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING,
    PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"
];
try {
    $bdd = new PDO('' . $sgbd . ':host=' . $host . ';dbname=' . $database . ';',
'' . $user . '', '' . $password . '', $options);
} catch (Exception $e) {
    die('Erreur : ' . $e->getMessage());
}
?>

This is the 1st file called by my pages, right after session_start();. I really don't get what can be wrong.
I was not prepared to this, thanks for helping !

EDIT : I "solved" the problem, but don't know how it happened. The file was automatically modified on upload, deleting the space between the begining of the PHP code and my first variable :

1 | <?php$sgbd = "mysql";

I verified this file and modified it many times to try to find a solution. The only way was to delete and re-upload the complete project.

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Answer 1

There's no syntax error in the quoted source with the exception that if you are running this code on PHP 5.3 or earlier, then this:

$options = [
    PDO::ATTR_ERRMODE => PDO::ERRMODE_WARNING,
    PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"
];

will cause syntax error as this short array syntax is available since 5.4.

Aside from the above, the following line:

$bdd = new PDO('' . $sgbd . ':host=' . $host . ';dbname=' . $database . ';',
               '' . $user . '', '' . $password . '', $options);

is over-engeneered. There's absolutely no point of doing '' you typed a lot as this simply equals to empty string. Second row also shows that you got problem understanding the difference between variable and variable's value. This should be easily written as:

$bdd = new PDO("{$sgbd}:host={$host};dbname={$database};", $user, $password, $options);

Aside from the above it should not be the cause of 500 you are facing.

EDIT

If you can invoke PHP from command line (on most linuxes it comes as separate package (i.e. php-cli so you may need to install it first)), then you can check the syntax of your file using -l switch:

$ php -l file.php

if there's any issue, then you will see the error message. If you see just Errors parsing file.php but no details, add -d error_reporting=E_ALL to the argument list:

$ php -d error_reporting=E_ALL -l file.php

Alternatively, you can simply try to access your file directly in browser (if it is not in document root, just copy it to make it available - it does not matter calling it alone makes no sense - you just need to ensure you are looking at right file - if you do, then syntax error will be logged. If this is wrong file, then nothing should happen really.