Видео ютуба по тегу Fatal Error: Uncaught Error: Call To Undefined Function Xyz()

Getting Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() when linking...
Getting Fatal error: Uncaught Error: Call to undefined function plugin_dir_path() when linking...
Fatal error: Uncaught Error: Call to undefined function mysql_query() |knowledgetechurdu
Fatal error: Uncaught Error: Call to undefined function mysql_query() |knowledgetechurdu
Fatal error: Uncaught Error: Call to undefined function mysql_co0nnect() Fix |Knowledgetechurdu
Fatal error: Uncaught Error: Call to undefined function mysql_co0nnect() Fix |Knowledgetechurdu
Solved: Fatal error: Uncaught Error: Call to undefined function mysqli_connect()
Solved: Fatal error: Uncaught Error: Call to undefined function mysqli_connect()
Fatal error Uncaught Error Call to undefined function xyz in PHP: (Fixed)
Fatal error Uncaught Error Call to undefined function xyz in PHP: (Fixed)