When you see message “Class X is not a valid entity or mapped super class” you can solve this problem with adding two lines to the .htaccess file:

php_flag eaccelerator.enable 0
php_flag eaccelerator.optimizer 0

$host = $this->getContainer()->getParameter('host');
$this->getContainer()->get('router')->getContext()->setHost($host);

$this->getContainer()->get('router')->getContext()->setScheme('https');
$this->getContainer()->get('router')->getContext()->setBaseUrl('/web');

Use this snippet:

$trim = trim($text, " \xC2\xA0\n\t\r\0\x0B");

\xC2\xA0 is non-breaking space (alt+space in mac os x)

Deprecated: Function split() is deprecated in deprecated.php on line 9

Simply turn off these warnings in your php.ini 1.error_reporting = E_ALL & ~E_DEPRECATED

Or during runtime 1.error_reporting(E_ALL & ~E_DEPRECATED);

Following function will throw this warning:
- call_user_method_array() instead use call_user_func_array()
- define_syslog_variables()
- dl()
- ereg_replace() instead use preg_replace()
- eregi() instead use preg_match()
- eregi_replace() instead use preg_replace()
- set_magic_quotes_runtime() instead use magic_quotes_runtime()
- session_register() instead use setzte Variable über $_SESSION
- session_unregister()
- session_is_registered()
- set_socket_blocking() instead use stream_set_blocking()
- split() instead use preg_split()
- spliti() instead use preg_split()
- sql_regcase()
- mysql_db_query() instead use mysql_select_db() oder mysql_query()
- mysql_escape_string() instead use mysql_real_escape_string()

Sometimes I have to capitalize words in my pages. The problem is these words are encoded in UTF-8. Simple solution to resolve it:

$word = 'kędzierzyn-koźle';
$word = mb_convert_case($word, MB_CASE_TITLE, 'UTF-8');