# Nginx Showing Blank Php Pages

If Nginx is serving blank pages for PHP files, it generally indicates a problem with how PHP is being processed. This issue is often related to the configuration of PHP-FPM (FastCGI Process Manager) or issues in the PHP code itself. Here's a step-by-step guide to troubleshoot and resolve the issue:

### **1. Verify PHP-FPM is Installed and Running**

Ensure that PHP-FPM is installed and running on your server.

**Check PHP-FPM Service Status:**

```bash
sudo systemctl status php-fpm
```

**Explanation:**

- This command checks the status of the PHP-FPM service (for distributions like CentOS or RHEL). For Debian-based systems, it might be named `php7.4-fpm` or similar.

**Start or Restart PHP-FPM:**

```bash
sudo systemctl restart php-fpm
```

### **2. Check Nginx Configuration**

Ensure that your Nginx configuration is correctly set up to handle PHP files.

**Example Configuration for PHP with Nginx:**

```
server {
    listen 80;
    server_name your-domain.com;
    root /var/www/html;
    index index.php index.html;

    location / {
        try_files $uri $uri/ =404;
    }

    location ~ \\.php$ {
        include snippets/fastcgi-php.conf;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;  # Adjust PHP version and path if necessary
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

    location ~ /\\.ht {
        deny all;
    }
}

```

**Explanation:**

- **`include snippets/fastcgi-php.conf;`**: Includes common FastCGI configurations.
- **`fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;`**: Adjust this path to match your PHP-FPM socket or TCP address.
- **`fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;`**: Ensures the correct path to the PHP script is passed to PHP-FPM.

### **3. Test PHP Processing**

Create a simple PHP info file to test if PHP is being processed correctly.

**Create PHP Info File:**

```bash
sudo nano /var/www/html/info.php
```

**Add the Following Content:**

```php
<?php
phpinfo();
?>
```

**Access the File in Your Browser:**

Navigate to `http://your-domain.com/info.php`.

**Expected Result:**

You should see a PHP information page. If the page is blank, PHP is not processing correctly.

### **4. Check PHP-FPM Logs**

Look at the PHP-FPM logs for errors that might explain why PHP pages are blank.

**Location of Logs:**

- **Debian/Ubuntu:** `/var/log/php7.4-fpm.log`
- **CentOS/RHEL:** `/var/log/php-fpm/www-error.log`

**Command to View Logs:**

```bash
sudo tail -f /var/log/php7.4-fpm.log
```

**Explanation:**

- This command will show recent log entries. Look for errors related to PHP-FPM.

### **5. Check Nginx Logs**

Nginx logs might also provide clues about what is going wrong.

**View Nginx Error Log:**

```bash
sudo tail -f /var/log/nginx/error.log
```

### **6. Validate PHP Configuration**

Check if your PHP configuration files are correctly set up and that there are no syntax errors in PHP scripts.

**Command to Check PHP Configuration:**

```bash
php -l /path/to/your/script.php
```

**Explanation:**

- **`php -l`**: This command checks the syntax of a PHP file.

### **7. Adjust PHP Configuration Settings**

Ensure that PHP settings in `php.ini` are configured correctly. For example, check if `display_errors` is enabled for development purposes:

**Find PHP Configuration File:**

```bash
php --ini
```

**Edit PHP Configuration File:**

```bash
sudo nano /etc/php/7.4/fpm/php.ini
```

**Enable Error Display (Development Only):**

```
display_errors = On
error_reporting = E_ALL
```

**Restart PHP-FPM after Changes:**

```bash
sudo systemctl restart php-fpm
```

### **8. Permissions and Ownership**

Ensure that Nginx and PHP-FPM have the correct permissions to access your PHP files.

**Set Correct Ownership and Permissions:**

```bash
sudo chown -R www-data:www-data /var/www/html
sudo find /var/www/html -type d -exec chmod 755 {} \\;
sudo find /var/www/html -type f -exec chmod 644 {} \\;
```

**Explanation:**

- **`chown -R www-data:www-data`**: Sets the correct owner and group for Nginx and PHP-FPM to access files.
- **`chmod 755` and `chmod 644`**: Sets appropriate permissions for directories and files.

### **Summary**

To resolve the issue of Nginx serving blank PHP pages:

1. **Verify PHP-FPM is Running:** Ensure PHP-FPM is active and properly configured.
2. **Check Nginx Configuration:** Ensure `location` blocks are correctly set up for PHP processing.
3. **Test PHP Processing:** Use a `phpinfo()` script to check PHP functionality.
4. **Check Logs:** Review PHP-FPM and Nginx logs for errors.
5. **Validate PHP Configuration:** Check PHP syntax and configuration settings.
6. **Adjust Settings:** Ensure PHP error reporting is enabled and permissions are correct.
7. **Restart Services:** Restart Nginx and PHP-FPM after making changes.

By following these steps, you should be able to diagnose and fix issues with Nginx serving blank PHP pages.