我总是在php脚本的最顶部使用这种语法。

ini_set('error_reporting', E_ALL);
ini_set('display_errors', 'On');  //On or Off

下面的代码应该显示所有错误:

<?php

// ----------------------------------------------------------------------------------------------------
// - Display Errors
// ----------------------------------------------------------------------------------------------------
ini_set('display_errors', 'On');
ini_set('html_errors', 0);

// ----------------------------------------------------------------------------------------------------
// - Error Reporting
// ----------------------------------------------------------------------------------------------------
error_reporting(-1);

// ----------------------------------------------------------------------------------------------------
// - Shutdown Handler
// ----------------------------------------------------------------------------------------------------
function ShutdownHandler()
{
    if(@is_array($error = @error_get_last()))
    {
        return(@call_user_func_array('ErrorHandler', $error));
    };

    return(TRUE);
};

register_shutdown_function('ShutdownHandler');

// ----------------------------------------------------------------------------------------------------
// - Error Handler
// ----------------------------------------------------------------------------------------------------
function ErrorHandler($type, $message, $file, $line)
{
    $_ERRORS = Array(
        0x0001 => 'E_ERROR',
        0x0002 => 'E_WARNING',
        0x0004 => 'E_PARSE',
        0x0008 => 'E_NOTICE',
        0x0010 => 'E_CORE_ERROR',
        0x0020 => 'E_CORE_WARNING',
        0x0040 => 'E_COMPILE_ERROR',
        0x0080 => 'E_COMPILE_WARNING',
        0x0100 => 'E_USER_ERROR',
        0x0200 => 'E_USER_WARNING',
        0x0400 => 'E_USER_NOTICE',
        0x0800 => 'E_STRICT',
        0x1000 => 'E_RECOVERABLE_ERROR',
        0x2000 => 'E_DEPRECATED',
        0x4000 => 'E_USER_DEPRECATED'
    );

    if(!@is_string($name = @array_search($type, @array_flip($_ERRORS))))
    {
        $name = 'E_UNKNOWN';
    };

    return(print(@sprintf("%s Error in file \xBB%s\xAB at line %d: %s\n", $name, @basename($file), $line, $message)));
};

$old_error_handler = set_error_handler("ErrorHandler");

// other php code

?>

使用此代码生成空白页的唯一方法是在关闭处理程序中出现错误时。我复制并粘贴了这个从我自己的cms没有测试，但我相信它工作。

打开php.ini， 确保它被设置为:

display_errors = On

重新启动服务器。

这个答案是由冗余部门为您带来的。

ini_set() / php.ini / .htaccess / .user.ini The settings display_errors and error_reporting have been covered sufficiently now. But just to recap when to use which option: ini_set() and error_reporting() apply for runtime errors only. php.ini should primarily be edited for development setups. (Webserver and CLI version often have different php.ini's) .htaccess flags only work for dated setups (Find a new hoster! Well managed servers are cheaper.) .user.ini are partial php.ini's for modern setups (FCGI/FPM) And as crude alternative for runtime errors you can often use: set_error_handler("var_dump"); // ignores error_reporting and `@` suppression error_get_last() Can be used to retrieve the last runtime notice/warning/error, when error_display is disabled. $php_errormsg Is a superlocal variable, which also contains the last PHP runtime message. isset() begone! I know this will displease a lot of folks, but isset and empty should not be used by newcomers. You can add the notice suppression after you verified your code is working. But never before. A lot of the "something doesn't work" questions we get lately are the result of typos like: if(isset($_POST['sumbit'])) # ↑↑ You won't get any useful notices if your code is littered with isset/empty/array_keys_exists. It's sometimes more sensible to use @, so notices and warnings go to the logs at least. assert_options(ASSERT_ACTIVE|ASSERT_WARNING); To get warnings for assert() sections. (Pretty uncommon, but more proficient code might contain some.) PHP7 requires zend.assertions=1 in the php.ini as well. declare(strict_types=1); Bending PHP into a strictly typed language is not going to fix a whole lot of logic errors, but it's definitely an option for debugging purposes. PDO / MySQLi And @Phil already mentioned PDO/MySQLi error reporting options. Similar options exist for other database APIs of course. json_last_error() + json_last_error_msg For JSON parsing. preg_last_error() For regexen. CURLOPT_VERBOSE To debug curl requests, you need CURLOPT_VERBOSE at the very least. shell/exec() Likewise will shell command execution not yield errors on its own. You always need 2>&1 and peek at the $errno.

打开错误报告是正确的解决方案，但是它似乎不会在打开它的程序中生效，而只会在随后包含的程序中生效。

因此，我总是创建一个文件/程序(我通常称之为“genwrap.php”)，它的代码本质上与这里流行的解决方案相同。打开错误报告)，然后它还包括我实际想要调用的页面。

实现这个调试有两个步骤;

首先，创建genwrap.php，然后把下面的代码放进去:

<?php
error_reporting(-1);
ini_set('display_errors', 'On');

include($_REQUEST['page']);
?>

第二，将你想要调试的程序/页面的链接改为通过genwrap.php，

例如:改变:

$.ajax('dir/pgm.php?param=val').done(function(data) { /* ... */

to

$.ajax('dir/genwrap.php?page=pgm.php&param=val').done(function(data) { /* ... */

有一个非常有用的扩展名为“xdebug”，它也会使您的报告更好。