The error_reporting() function sets the error_reporting directive at runtime. PHP has many levels of errors, using this function sets that level for the duration (runtime) of your script.
error_reporting() sets PHP's error reporting level, and returns the old level. The level parameter takes on either a bitmask, or named constants. Using named constants is strongly encouraged to ensure compatibility for future versions. As error levels are added, the range of integers increases, so older integer-based error levels will not always behave as expected.
Some example uses:
The available error level constants are listed below. The actual meanings of these error levels are described in the predefined constants.
Table 1. error_reporting() level constants and bit values
| value | constant |
|---|---|
| 1 | E_ERROR |
| 2 | E_WARNING |
| 4 | E_PARSE |
| 8 | E_NOTICE |
| 16 | E_CORE_ERROR |
| 32 | E_CORE_WARNING |
| 64 | E_COMPILE_ERROR |
| 128 | E_COMPILE_WARNING |
| 256 | E_USER_ERROR |
| 512 | E_USER_WARNING |
| 1024 | E_USER_NOTICE |
| 2047 | E_ALL |
| 2048 | E_STRICT |
| Warning |
With PHP > 5.0.0 E_STRICT with value 2048 is available. E_ALL does NOT include error levelE_STRICT. |
See also the display_errors directive and ini_set().