• PHP supports several types of errors

o notices at runtime
o errors during parsing (prevents code execution)
o warnings at runtime
o fatal errors at runtime (stop code execution)
o Core errors and warnings
o user-defined notices, warnings, and errors

• php configuration setting error_reporting, or php’s error_reporting() function may be used to define which kinds of errors shall be reported

• Value is an integer, or – much more convenient – a bitmask based on pre-defined constants

o E_NOTICE, E_PARSE, E_WARNING, E_ERROR

o E_CORE_WARNING, E_CORE_ERROR

o E_USER_NOTICE, E_USER_WARNING ,E_USER_ERROR

o E_STRICT(„best practices“ notices)

o E_DEPRECATED (features that might disappear in future php versions)

o E_ALL(everything) o and some more

• Typical production setting: E_ALL & ~E_DEPRECATED & ~E_STRICT