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Predefined Constants
The constants below are always available as part of the PHP core.
The following constants (either the corresponding numerical value or their
symbolic name) are used as a bitmask to specify which errors to report.
It is possible to use
bitwise operators
to combine these values or mask out certain types of errors.
Tip
The name of the constants can be used within php.ini,
instead of the raw numerical values to which they correspond to.
However, only the
|,
~,
^,
!,
&
operators are understood within php.ini.
Warning
It is not possible to use the symbolic names outside of PHP.
For example in httpd.conf the computed bitmask value must be used instead.
-
E_ERROR
(int)
-
Fatal run-time errors.
These indicate errors that can not be recovered from,
such as a memory allocation problem.
Execution of the script is halted.
Value of the constant:
1
-
E_WARNING
(int)
-
Run-time warnings (non-fatal errors).
Execution of the script is not halted.
Value of the constant:
2
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E_PARSE
(int)
-
Compile-time parse errors.
Parse errors should only be generated by the parser.
Value of the constant:
4
-
E_NOTICE
(int)
-
Run-time notices.
Indicate that the script encountered something that could indicate an error,
but could also happen in the normal course of running a script.
Value of the constant:
8
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E_CORE_ERROR
(int)
-
Fatal errors that occur during PHP's initial startup.
This is like an
E_ERROR,
except it is generated by the core of PHP.
Value of the constant: 16
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E_CORE_WARNING
(int)
-
Warnings (non-fatal errors) that occur during PHP's initial startup.
This is like an
E_WARNING,
except it is generated by the core of PHP.
Value of the constant: 32
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E_COMPILE_ERROR
(int)
-
Fatal compile-time errors.
This is like an
E_ERROR,
except it is generated by the Zend Scripting Engine.
Value of the constant: 64
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E_COMPILE_WARNING
(int)
-
Compile-time warnings (non-fatal errors).
This is like an
E_WARNING,
except it is generated by the Zend Scripting Engine.
Value of the constant: 128
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E_DEPRECATED
(int)
-
Run-time deprecation notices.
Enable this to receive warnings about code
that will not work in future versions.
Value of the constant:
8192
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E_USER_ERROR
(int)
-
User-generated error message.
This is like an
E_ERROR,
except it is generated in PHP code by using the PHP function
trigger_error.
Value of the constant: 256
Warning
Usage of this constant with trigger_error is
deprecated as of PHP 8.4.0.
It is recommended to either throw an Exception
or call exit instead.
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E_USER_WARNING
(int)
-
User-generated warning message.
This is like an
E_WARNING,
except it is generated in PHP code by using the PHP function
trigger_error.
Value of the constant: 512
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E_USER_NOTICE
(int)
-
User-generated notice message.
This is like an
E_NOTICE,
except it is generated in PHP code by using the PHP function
trigger_error.
Value of the constant: 1024
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E_USER_DEPRECATED
(int)
-
User-generated deprecation message.
This is like an
E_DEPRECATED,
except it is generated in PHP code by using the PHP function
trigger_error.
Value of the constant: 16384
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E_STRICT
(int)
-
Run-time suggestions emitted by PHP about the executed code
to ensure forward compatibility.
Value of the constant:
2048
Warning
This error level is unused,
and has been deprecated as of PHP 8.4.0.
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E_RECOVERABLE_ERROR
(int)
-
Legacy engine "exceptions" which correspond to catchable fatal error.
Similar to Error but must be caught via a
user defined error handler (see set_error_handler).
If not handled, this behaves like
E_ERROR.
Value of the constant: 4096
Note:
This error level is effectively unused,
the only case where this can happen is when interpreting an
object as a bool fails.
This can only happen for internal objects.
The most common example, prior to PHP 8.4.0, is using a
GMP instance in a conditional.
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E_ALL
(int)
-
Bit-mask that contains every single error, warning, and notice.
Value of the constant:
32767
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