“白屏死机（WSOD）”

如何诊断和修复空白页，参见XOOPS。

诊断流程图

flowchart TD
    A[White Screen] --> B{PHP Errors Visible?}
    B -->|No| C[Enable Error Display]
    B -->|Yes| D[Read Error Message]

    C --> E{Errors Now Visible?}
    E -->|Yes| D
    E -->|No| F[Check PHP Error Log]

    D --> G{Error Type?}
    G -->|Memory| H[Increase memory_limit]
    G -->|Syntax| I[Fix PHP Syntax]
    G -->|Missing File| J[Restore File]
    G -->|Permission| K[Fix Permissions]
    G -->|Database| L[Check DB Connection]

    F --> M{Log Has Errors?}
    M -->|Yes| D
    M -->|No| N[Check Web Server Logs]

    N --> O{Found Issue?}
    O -->|Yes| D
    O -->|No| P[Enable XOOPS Debug]

快速诊断

第 1 步：启用 PHP 错误显示

暂时添加到mainfile.php：

<?php
// Add at the very top, after <?php
error_reporting(E_ALL);
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');

步骤 2：检查PHP错误日志

# Common log locations
tail -100 /var/log/php/error.log
tail -100 /var/log/apache2/error.log
tail -100 /var/log/nginx/error.log

# Or check PHP info for log location
php -i | grep error_log

步骤 3：启用 XOOPS 调试

// In mainfile.php
define('XOOPS_DEBUG_LEVEL', 2);

常见原因及解决方案

pie title WSOD Common Causes
    "Memory Limit" : 25
    "PHP Syntax Error" : 20
    "Missing Files" : 15
    "Database Issues" : 15
    "Permissions" : 10
    "Template Errors" : 10
    "Timeout" : 5

1.超出内存限制

症状：

大型操作的空白页
适用于小数据，不适用于大数据

错误：

Fatal error: Allowed memory size of 134217728 bytes exhausted

解决方案：

// In mainfile.php
ini_set('memory_limit', '256M');

// Or in .htaccess
php_value memory_limit 256M

// Or in php.ini
memory_limit = 256M

2.PHP语法错误

症状：

编辑 PHP 文件后的WSOD
特定页面失败，其他页面正常

错误：

Parse error: syntax error, unexpected '}' in /path/file.php on line 123

解决方案：

# Check file for syntax errors
php -l /path/to/file.php

# Check all PHP files in module
find modules/mymodule -name "*.php" -exec php -l {} \;

3. 缺少所需文件

症状：

upload/migration之后的WSOD
随机页面失败

错误：

Fatal error: require_once(): Failed opening required 'class/Helper.php'

解决方案：

# Re-upload missing files
# Compare against fresh installation
diff -r /path/to/xoops /path/to/fresh-xoops

# Check file permissions
ls -la class/

4.数据库连接失败

症状：

所有页面均显示WSOD
静态文件（图像，CSS）工作

错误：

Warning: mysqli_connect(): Access denied for user

解决方案：

// Verify credentials in mainfile.php
define('XOOPS_DB_HOST', 'localhost');
define('XOOPS_DB_USER', 'your_user');
define('XOOPS_DB_PASS', 'your_password');
define('XOOPS_DB_NAME', 'your_database');

// Test connection manually
<?php
$conn = new mysqli('localhost', 'user', 'pass', 'database');
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
echo "Connected successfully";

5.权限问题

症状：

写入文件时WSOD
Cache/compile错误

解决方案：

# Fix directory permissions
chmod -R 755 htdocs/
chmod -R 777 xoops_data/
chmod -R 777 uploads/

# Fix ownership
chown -R www-data:www-data /path/to/xoops

6.Smarty模板错误

症状：

特定页面上的WSOD
清除缓存后有效

解决方案：

# Clear Smarty cache
rm -rf xoops_data/caches/smarty_cache/*
rm -rf xoops_data/caches/smarty_compile/*

# Check template syntax

7. 最大执行时间

症状： -约 30 秒后WSOD

长时间操作失败

错误：

Fatal error: Maximum execution time of 30 seconds exceeded

解决方案：

// In mainfile.php
set_time_limit(300);

// Or in .htaccess
php_value max_execution_time 300

调试脚本

在 XOOPS 根目录中创建 debug.php：

<?php
/**
 * XOOPS Debug Script
 * Delete after troubleshooting!
 */

error_reporting(E_ALL);
ini_set('display_errors', '1');

echo "<h1>XOOPS Debug</h1>";

// Check PHP version
echo "<h2>PHP Version</h2>";
echo "PHP " . PHP_VERSION . "<br>";

// Check required extensions
echo "<h2>Required Extensions</h2>";
$required = ['mysqli', 'gd', 'curl', 'json', 'mbstring'];
foreach ($required as $ext) {
    $status = extension_loaded($ext) ? '✓' : '✗';
    echo "$status $ext<br>";
}

// Check file permissions
echo "<h2>Directory Permissions</h2>";
$dirs = [
    'xoops_data' => 'xoops_data',
    'uploads' => 'uploads',
    'cache' => 'xoops_data/caches'
];
foreach ($dirs as $name => $path) {
    $writable = is_writable($path) ? '✓ Writable' : '✗ Not writable';
    echo "$name: $writable<br>";
}

// Test database connection
echo "<h2>Database Connection</h2>";
if (file_exists('mainfile.php')) {
    // Extract credentials (simple regex, not production safe)
    $mainfile = file_get_contents('mainfile.php');
    preg_match("/XOOPS_DB_HOST.*'(.+?)'/", $mainfile, $host);
    preg_match("/XOOPS_DB_USER.*'(.+?)'/", $mainfile, $user);
    preg_match("/XOOPS_DB_PASS.*'(.+?)'/", $mainfile, $pass);
    preg_match("/XOOPS_DB_NAME.*'(.+?)'/", $mainfile, $name);

    if (!empty($host[1])) {
        $conn = @new mysqli($host[1], $user[1], $pass[1], $name[1]);
        if ($conn->connect_error) {
            echo "✗ Connection failed: " . $conn->connect_error;
        } else {
            echo "✓ Connected to database";
            $conn->close();
        }
    }
} else {
    echo "mainfile.php not found";
}

// Memory info
echo "<h2>Memory</h2>";
echo "Memory Limit: " . ini_get('memory_limit') . "<br>";
echo "Current Usage: " . round(memory_get_usage() / 1024 / 1024, 2) . " MB<br>";

// Check error log location
echo "<h2>Error Log</h2>";
echo "Location: " . ini_get('error_log');

预防

graph LR
    A[Backup Before Changes] --> E[Stable Site]
    B[Test in Development] --> E
    C[Monitor Error Logs] --> E
    D[Use Version Control] --> E

在进行更改之前始终进行备份
部署前在本地测试
定期监控错误日志
使用git来跟踪更改
在支持的版本内保持PHP更新

“白屏死机（WSOD）”

诊断流程图

快速诊断

第 1 步：启用 PHP 错误显示

步骤 2：检查PHP错误日志

步骤 3：启用 XOOPS 调试

常见原因及解决方案

1.超出内存限制

2.PHP语法错误

3. 缺少所需文件

4.数据库连接失败

5.权限问题

6.Smarty模板错误

7. 最大执行时间

调试脚本

预防

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