zend_error() can be used to generate error messages.
This function accepts two arguments; the first is the error type (see
zend_errors.h), and the second is the error message.
Figure 36-1. Table 9.16. Zend's Predefined Error Messages. Figure 36-2. Figure 9.8. Display of warning messages in the browser.
Table 9.16 shows a list of possible values (see Figure 9.8). These
values are also referred to in php.ini. Depending on
which error type you choose, your messages will be logged.
zend_error(E_WARNING, "This function has been called with empty arguments");
Error Description E_ERROR
Signals an error and terminates execution of the script
immediately
. E_WARNING
Signals a generic warning. Execution continues.
E_PARSE
Signals a parser error. Execution continues.
E_NOTICE
Signals a notice. Execution continues. Note that by
default the display of this type of error messages is turned off in
php.ini.
E_CORE_ERROR
Internal error by the core; shouldn't be used by
user-written modules.
E_COMPILE_ERROR
Internal error by the compiler; shouldn't be used by
user-written modules.
E_COMPILE_WARNING
Internal warning by the compiler; shouldn't be used by
user-written modules.