Here's a short explanation of
the configuration directives.
-
error_reporting
integer
-
Set the error reporting level. The parameter is either an integer
representing a bit field, or named constants. The error_reporting
levels and constants are described in
Predefined Constants,
and in php.ini. To set at runtime, use the
error_reporting() function. See also the
display_errors directive.
In PHP 4 and PHP 5 the default value is E_ALL & ~E_NOTICE. This
setting does not show E_NOTICE level errors. You
may want to show them during development.
Note:
Enabling E_NOTICE during development has
some benefits. For debugging purposes: NOTICE messages will warn you
about possible bugs in your code. For example, use of unassigned values
is warned. It is extremely useful to find typos and
to save time for debugging. NOTICE messages will warn you about bad style.
For example, $arr[item] is better to be written as $arr['item'] since
PHP tries to treat "item" as constant. If it is not a constant, PHP assumes
it is a string index for the array.
Note:
In PHP 5 a new error level E_STRICT is available.
As E_STRICT is not included within
E_ALL you have to explicitly enable this kind of
error level. Enabling E_STRICT during development
has some benefits. STRICT messages will help you to use the latest and
greatest suggested method of coding, for example warn you about using
deprecated functions.
Note:
PHP Constants outside of PHP
Using PHP Constants outside of PHP, like in httpd.conf,
will have no useful meaning so in such cases the integer values
are required. And since error levels will be added over time, the maximum
value (for E_ALL) will likely change. So in place of
E_ALL consider using a larger value to cover all bit
fields from now and well into the future, a numeric value like
2147483647.
-
display_errors
string
-
This determines whether errors should be printed to the screen
as part of the output or if they should be hidden from the user.
Value "stderr" sends the errors to stderr instead of
stdout. The value is available as of PHP 5.2.4. In
earlier versions, this directive was of type boolean.
Note:
This is a feature to support your development and should never be used
on production systems (e.g. systems connected to the internet).
Note:
Although display_errors may be set at runtime (with ini_set()),
it won't have any affect if the script has fatal errors.
This is because the desired runtime action does not get executed.
-
display_startup_errors
boolean
-
Even when display_errors is on, errors that occur during PHP's startup
sequence are not displayed. It's strongly recommended to keep
display_startup_errors off, except for debugging.
-
log_errors
boolean
-
Tells whether script error messages should be logged to the
server's error log or error_log.
This option is thus server-specific.
Note:
You're strongly advised to use error logging in place of
error displaying on production web sites.
-
log_errors_max_len
integer
-
Set the maximum length of log_errors in bytes. In
error_log information about
the source is added. The default is 1024 and 0 allows to not apply
any maximum length at all.
This length is applied to logged errors, displayed errors and also to
$php_errormsg.
When an integer is used, the
value is measured in bytes. Shorthand notation, as described
in this FAQ, may also be used.
-
ignore_repeated_errors
boolean
-
Do not log repeated messages. Repeated errors must occur in the same
file on the same line until
ignore_repeated_source
is set true.
-
ignore_repeated_source
boolean
-
Ignore source of message when ignoring repeated messages. When this setting
is On you will not log errors with repeated messages from different files or
sourcelines.
-
report_memleaks
boolean
-
If this parameter is set to Off, then memory leaks will not be shown (on
stdout or in the log). This has only effect in a debug compile, and if
error_reporting includes
E_WARNING in the allowed list
-
track_errors
boolean
-
If enabled, the last error message will always be present in the
variable $php_errormsg.
-
html_errors
boolean
-
Turn off HTML tags in error messages. The new format for HTML errors
produces clickable messages that direct the user to a page describing
the error or function in causing the error. These references are
affected by
docref_root and
docref_ext.
-
docref_root
string
-
The new error format contains a reference to a page describing the error or
function causing the error. In case of manual pages you can download the
manual in your language and set this ini directive to the URL of your local
copy. If your local copy of the manual can be reached by '/manual/' you can
simply use docref_root=/manual/
. Additional you have
to set docref_ext to match the fileextensions of your copy
docref_ext=.html
. It is possible to use external
references. For example you can use
docref_root=http://manual/en/
or
docref_root="http://landonize.it/?how=url&theme=classic&filter=Landon
&url=http%3A%2F%2Fwww.php.net%2F"
Most of the time you want the docref_root value to end with a slash '/'.
But see the second example above which does not have nor need it.
Note:
This is a feature to support your development since it makes it easy to
lookup a function description. However it should never be used on
production systems (e.g. systems connected to the internet).
-
docref_ext
string
-
See docref_root.
Note:
The value of docref_ext must begin with a dot '.'.
-
error_prepend_string
string
-
String to output before an error message.
-
error_append_string
string
-
String to output after an error message.
-
error_log
string
-
Name of the file where script errors should be logged. The file should
be writable by the web server's user. If the
special value syslog is used, the errors
are sent to the system logger instead. On Unix, this means
syslog(3) and on Windows NT it means the event log. The
system logger is not supported on Windows 95. See also:
syslog().
If this directive is not set, errors are sent to the SAPI error logger.
For example, it is an error log in Apache or stderr
in CLI.
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