First of all Shift + Ctrl + L will show all commands.
These are my favorites except for the obvious ones I don’t have to mention like Ctrl+Shift+Right/Left to select whole word and stuff like that. Pretty common functionality in all editors.
Shift + Alt + O to toggle show occurrences.
Alt + Right/Left to to forwards/backwards in history.
Ctrl + Shift + Numpad_divide to collapse all functions in document.
Ctrl + Numpad_multiply to expand all functions in document.
Alt + Up/Down to move row up/down.
Ctrl + Alt + Up/Down to copy row up/down.
Ctrl + L go to line.
Ctrl + Delete to delete next word.
Ctrl + Backspace to delete previous word.
Shift + Ctrl + Delete to delete to the end of the line.
Ctrl + K to jump to next occurrence in document of word the cursor is on when pressed.
Shift + Ctrl + M/T/R to open selection window to jump to Method, Type (class) or Resource (file).
Shift + Ctrl + Enter to insert new line above current line.
Shift + Enter to insert new line below current line.
Ctrl + Q to jump to last edit location.
Shift + Ctrl + > to jump to matching tag.
Ctrl + M to toggle maximize current editor.
Ctrl + Page Down/Page Up to go back and forth among the tabs.
Ctrl (+ Shift) + F6 to go back and forth among tabs across split screens (I have remapped this one to TAB instead of F6).
Shift + Ctrl + P to go to matching bracket.
Shift + F2 to jump to php manual documentation.