PHP 7 Error Levels
There are sixteen different error levels [i.e. types] are available in PHP.
Error Levels in PHP
Usually, whenever the PHP engine encounters a problem that prevents a script from running properly it generate an error message. There are sixteen different error levels and each level is represented by an integer value and an associated constant. Here's a list of error levels:
| E_ERROR | 1 | A fatal run-time error, that can't be recovered from. The execution of the script is stopped immediately. |
| E_WARNING | 2 | A run-time warning. It is non-fatal and most errors tend to fall into this category. The execution of the script is not stopped. |
| E_PARSE | 4 | The compile-time parse error. Parse errors should only be generated by the parser. |
| E_NOTICE | 8 | A run-time notice indicating that the script encountered something that could possibly an error, although the situation could also occur when running a script normally. |
| E_CORE_ERROR | 16 | A fatal error that occur during the PHP's engine initial startup. This is like an E_ERROR, except it is generated by the core of PHP. |
| E_CORE_WARNING | 32 | A non-fatal error that occur during the PHP's engine initial startup. This is like an E_WARNING, except it is generated by the core of PHP. |
| E_COMPILE_ERROR | 64 | A fatal error that occur while the script was being compiled. This is like an E_ERROR, except it is generated by the Zend Scripting Engine. |
| E_COMPILE_WARNING | 128 | A non-fatal error occur while the script was being compiled. This is like an E_WARNING, except it is generated by the Zend Scripting Engine. |
| E_USER_ERROR | 256 | A fatal user-generated error message. This is like an E_ERROR, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_USER_WARNING | 512 | A non-fatal user-generated warning message. This is like an E_WARNING, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine |
| E_USER_NOTICE | 1024 | A user-generated notice message. This is like an E_NOTICE, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_STRICT | 2048 | Not strictly an error, but triggered whenever PHP encounters code that could lead to problems or forward incompatibilities |
| E_RECOVERABLE_ERROR | 4096 | A catchable fatal error. Although the error was fatal, it did not leave the PHP engine in an unstable state. If the error is not caught by a user defined error handler [see set_error_handler[]], the application aborts as it was an E_ERROR. |
| E_DEPRECATED | 8192 | A run-time notice indicating that the code will not work in future versions of PHP |
| E_USER_DEPRECATED | 16384 | A user-generated warning message. This is like an E_DEPRECATED, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_ALL | 32767 | All errors and warnings, except of level E_STRICT prior to PHP 5.4.0. |
PHP 7 Error Levels
There are sixteen different error levels [i.e. types] are available in PHP.
Nội dung chính
- PHP 7 Error Levels
- Error Levels in PHP
- How many error levels are available in PHP Mcq?
- What type of errors can be occurred in PHP?
- How show all errors in PHP?
- What is the value of E_parse type of error?
Error Levels in PHP
Usually, whenever the PHP engine encounters a problem that prevents a script from running properly it generate an error message. There are sixteen different error levels and each level is represented by an integer value and an associated constant. Here's a list of error levels:
| E_ERROR | 1 | A fatal run-time error, that can't be recovered from. The execution of the script is stopped immediately. |
| E_WARNING | 2 | A run-time warning. It is non-fatal and most errors tend to fall into this category. The execution of the script is not stopped. |
| E_PARSE | 4 | The compile-time parse error. Parse errors should only be generated by the parser. |
| E_NOTICE | 8 | A run-time notice indicating that the script encountered something that could possibly an error, although the situation could also occur when running a script normally. |
| E_CORE_ERROR | 16 | A fatal error that occur during the PHP's engine initial startup. This is like an E_ERROR, except it is generated by the core of PHP. |
| E_CORE_WARNING | 32 | A non-fatal error that occur during the PHP's engine initial startup. This is like an E_WARNING, except it is generated by the core of PHP. |
| E_COMPILE_ERROR | 64 | A fatal error that occur while the script was being compiled. This is like an E_ERROR, except it is generated by the Zend Scripting Engine. |
| E_COMPILE_WARNING | 128 | A non-fatal error occur while the script was being compiled. This is like an E_WARNING, except it is generated by the Zend Scripting Engine. |
| E_USER_ERROR | 256 | A fatal user-generated error message. This is like an E_ERROR, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_USER_WARNING | 512 | A non-fatal user-generated warning message. This is like an E_WARNING, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine |
| E_USER_NOTICE | 1024 | A user-generated notice message. This is like an E_NOTICE, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_STRICT | 2048 | Not strictly an error, but triggered whenever PHP encounters code that could lead to problems or forward incompatibilities |
| E_RECOVERABLE_ERROR | 4096 | A catchable fatal error. Although the error was fatal, it did not leave the PHP engine in an unstable state. If the error is not caught by a user defined error handler [see set_error_handler[]], the application aborts as it was an E_ERROR. |
| E_DEPRECATED | 8192 | A run-time notice indicating that the code will not work in future versions of PHP |
| E_USER_DEPRECATED | 16384 | A user-generated warning message. This is like an E_DEPRECATED, except it is generated by the PHP code using the function trigger_error[] rather than the PHP engine. |
| E_ALL | 32767 | All errors and warnings, except of level E_STRICT prior to PHP 5.4.0. |
This set of PHP Multiple Choice Questions & Answers [MCQs] focuses on “Error Handling”.
1. How many error levels are available in PHP?
a] 14
b] 15
c] 16
d] 17
View Answer
Answer: c
Explanation: Whenever the PHP engine encounters any problem that prevents a script from running properly it generates an error message. There are sixteen error levels and each level is represented by an integer value and an associated
constant.
2. What is the description of Error level E_ERROR?
a] Fatal run-time error
b] Near-fatal error
c] Compile-time error
d] Fatal Compile-time error
View Answer
Answer: a
Explanation: E_ERROR is a fatal run-time error, that can’t be recovered from and the execution of the script is stopped immediately.
3. Which version of PHP introduced E_STRICT Error level?
a] PHP 4
b] PHP 5
c] PHP 5.2
d] PHP 5.3
View
Answer
Answer: b
Explanation: E_STRICT is PHP version portability suggestions. It is not strictly an error, but it is triggered whenever PHP encounters code that could lead to problems or forward incompatibilities.
4. Which character does the error_reporting directive use to represent the logical operator NOT?
a] /
b] !
c] ~
d] ^
View Answer
Answer: c
Explanation: The twidle [~] character is used to represent the logical
operator NOT.
5. Say you want to report error concerned about fatal run-time, fatal compile-time error and core error which statement would you use?
a] error_reporting = E_ALL
b] error_reporting = E_ERROR | E_PARSE | E_CORE_ERROR
c] error_reporting = E_ERROR | E_COMPILE_WARNING | E_CORE_ERROR
d] error_reporting = E_ERROR | E_COMPILE_ERROR | E_CORE_ERROR
View Answer
Answer: d
Explanation: E_ERROR is a fatal run-time error, that can’t be
recovered from. E_COMPILE_ERROR is a fatal error that occurs while the script was being compiled. And E_CORE_ERROR is a fatal error that occurs during the PHP’s engine initial startup.
6. Which version introduced the function error_get_last[]?
a] PHP 4
b] PHP 5
c] PHP 5.2
d] PHP 5.3
View Answer
Answer: c
Explanation: This function returns an associative array consisting of the type, message, file, and line of the last occurring error.
7. Which of the following statements causes PHP to disregard repeated error messages that occur within the same file and on the same line?
a] ignore_repeated_errors
b] ignore_repeat_error
c] repeatedly_ignore_error
d] repeated_error_ignore
View Answer
Answer: a
Explanation: ignore_repeated_errors will not log repeated messages. The repeated errors must occur in the same file on the same line unless ignore_repeated_source is set to true.
8.
Which function initializes the constants necessary for using the openlog[], clodelog[], and syslog[] functions?
a] define_variable[]
b] define_log_variable[]
c] log_variable[]
d] define_syslog_variable[]
View Answer
Answer: d
Explanation: If you’re running PHP version 5.2.X or older, you need to execute this function before using any of the following logging functions.
9. Which logging option’s description is if an error occurs when writing to
the syslog, send output to the system console?
a] LOG_CONS
b] LOG_NDELAY
c] LOG_ODELAY
d] LOG_PERROR
View Answer
Answer: a
Explanation: If there is an error while sending data to the system logger, LOG_CONS will write directly to the system console.
10. Which function is responsible for sending a custom message to the system log?
a] systemlog[]
b] syslog[]
c] log_system[]
d] sys_log[]
View Answer
Answer:
b
Explanation: The function syslog[] generates a log message that will be distributed by the system logger.
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How many error levels are available in PHP Mcq?
Explanation: Whenever the PHP engine encounters any problem that prevents a script from running properly it generates an error message. There are sixteen error levels and each level is represented by an integer value and an associated constant.
What type of errors can be occurred in PHP?
In PHP, mainly four types of errors are considered:.
Syntax Error or Parse Error..
Fatal Error..
Warning Error..
Notice Error..
How show all errors in PHP?
Quickly Show All PHP Errors The quickest way to display all php errors and warnings is to add these lines to your PHP code file: ini_set['display_errors', 1]; ini_set['display_startup_errors', 1]; error_reporting[E_ALL];