Difference between Notice and warning and fatal error

Notice

• A notice is an advisory message like "You probably shouldn't be doing what you're doing"
• Execution of the script is not halted
• Example
  

  echo $undefinedVariable;

Warning

• A warning is a message like "You are doing something wrong and it is very likely to cause errors in the future, so please fix it." Execution of the script is not halted;
• Example
  

  echo 1/0;

Fatal Error

• Fatal run-time errors
• Execution of the script is not halted
• Example  

  require_once "notexistfile.php"

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