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+Debugging
+=========
+
+Logging
+-------
+
+PicoFeed can log **in memory** the execution flow, if a feed doesn't work correctly it's easy to see what is wrong.
+
+### Enable/disable logging
+
+The logging is **disabled by default** to avoid unnecessary memory usage.
+
+Enable logging:
+
+```php
+use PicoFeed\Logging\Logger;
+
+Logger::enable();
+
+// or change the flag value
+
+Logger::$enable = true;
+```
+
+### Reading messages
+
+```php
+use PicoFeed\Logging\Logger;
+
+// All messages are stored inside an Array
+print_r(Logger::getMessages());
+```
+
+You will got an output like that:
+
+```php
+Array
+(
+    [0] => Fetch URL: http://petitcodeur.fr/feed.xml
+    [1] => Etag:
+    [2] => Last-Modified:
+    [3] => cURL total time: 0.711378
+    [4] => cURL dns lookup time: 0.001064
+    [5] => cURL connect time: 0.100733
+    [6] => cURL speed download: 74825
+    [7] => HTTP status code: 200
+    [8] => HTTP headers: Set-Cookie => start=R2701971637; path=/; expires=Sat, 06-Jul-2013 05:16:33 GMT
+    [9] => HTTP headers: Date => Sat, 06 Jul 2013 03:55:52 GMT
+    [10] => HTTP headers: Content-Type => application/xml
+    [11] => HTTP headers: Content-Length => 53229
+    [12] => HTTP headers: Connection => close
+    [13] => HTTP headers: Server => Apache
+    [14] => HTTP headers: Last-Modified => Tue, 02 Jul 2013 03:26:02 GMT
+    [15] => HTTP headers: ETag => "393e79c-cfed-4e07ee78b2680"
+    [16] => HTTP headers: Accept-Ranges => bytes
+    ....
+)
+```
+
+### Remove messages
+
+All messages are stored in memory, if you need to clear them just call the method `Logger::deleteMessages()`:
+
+```php
+Logger::deleteMessages();
+```
+
+Command line utility
+====================
+
+PicoFeed provides a basic command line tool to debug feeds quickly.
+The tool is located in the root directory project.
+
+### Usage
+
+```bash
+$ ./picofeed
+Usage:
+./picofeed feed <feed-url>                   # Parse a feed a dump the ouput on stdout
+./picofeed debug <feed-url>                  # Display all logging messages for a feed
+./picofeed item <feed-url> <item-id>         # Fetch only one item
+./picofeed nofilter <feed-url> <item-id>     # Fetch an item but with no content filtering
+```
+
+### Example
+
+```bash
+$ ./picofeed debug https://linuxfr.org/
+Exception thrown ===> "Invalid SSL certificate"
+Array
+(
+    [0] => [2014-11-08 14:04:14] PicoFeed\Client\Curl Fetch URL: https://linuxfr.org/
+    [1] => [2014-11-08 14:04:14] PicoFeed\Client\Curl Etag provided:
+    [2] => [2014-11-08 14:04:14] PicoFeed\Client\Curl Last-Modified provided:
+    [3] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL total time: 1.850634
+    [4] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL dns lookup time: 0.00093
+    [5] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL connect time: 0.115213
+    [6] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL speed download: 0
+    [7] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL effective url: https://linuxfr.org/
+    [8] => [2014-11-08 14:04:16] PicoFeed\Client\Curl cURL error: SSL certificate problem: Invalid certificate chain
+)
+```