You can explore this https://gist.github.com/jbuchbinder/7419000
https://github.com/WordPress/WordPress/blob/master/wp-includes/deprecated.php
Deprecated functions: https://codex.wordpress.org/Category:Deprecated_Functions
You can explore this https://gist.github.com/jbuchbinder/7419000
https://github.com/WordPress/WordPress/blob/master/wp-includes/deprecated.php
Deprecated functions: https://codex.wordpress.org/Category:Deprecated_Functions