How many different types of messages available in PHP?

1. Error message: is received when the script has some problem that is preventing it from running correctly. The message consists of the possible solution or identification of the problem. Ex: Parse error: occurs when there is something gets missed while writing the script.
2. Warning message: is received when the script find out some problem that doesn’t allow the script to run. These messages are not of very high priority but quite essential to show that there is something wrong with the script. Ex: if you write print_r() instead of print_r($varname) then a warning will occur like this:
Warning: print_r() expects at least 1 parameter, 0 given
The script will execute in continuation.
3. Notice: is received when there is a condition where a script might have an error or may be it is working. Ex: echo variables that don’t exist.