Conditions

Here is my if...else example:
Today is Monday, I have to work tommorow

Here is my if...elseif...else:
It is Sep, the fall season

This is my switch/case example:
There is snow

In PHP, `if else` functions execute code based on a true/false condition, `if elseif else` functions handle multiple conditions in sequence, and `switch/case` functions check a variable against multiple values, executing code when a match is found.