PHP Debugging functions

<?php

#调试函数小结

1.debug_backtrace (): function generates a backtrace.

The function returns an associative array. Here are the elements that might be returned

Functions: Returns the current function name

Line: Current number of rows

File: The current file name

Class: The current category name

Object: Current Object

Type: The current invocation type, possibly called:

return->, Call of method

Return::, static method call

Return Nothing, Function call

Args: Array, if the function parameter is listed in the function. If the referenced file name is listed in the files being applied

Echo '

function Myfun ($arg) {

Print_r (Debug_backtrace ());

}

Myfun (' Hello ');

2.debug_print_backtrace (): function Output BackTrace

Echo '

function Myfun1 ($arg) {

Print_r (Debug_print_backtrace ());

}

Myfun1 (' Hello ');

3.error_get_last (): function gets the last error that occurred

The function returns the last error as an array, with 4 keys and values in the array, respectively:

Type: Error types

Message: Error message

File: The files where the error occurred

Line: The row where the error occurred

Echo '

/*error_reporting (0);

Echo $test;

Print_r (Error_get_last ()); * *

The 4.error_log (error,type,destination,headers) function returns an error that is sent to the server error record, file, or remote destination.

Returns true if successful, otherwise false

Error: Must be. The error message to log

Type: optional, respectively:

0-default. Depending on the error_log configuration in the php.ini file, the error is sent to the server log system or file

1-The error is sent to the address in the destination parameter. Only this type uses headers

2-send error via PHP debugging connection. option is only available in PhP3

3-Error sent to file destination string

Destination: Optional. Specifies where to send the error message. The value of the parameter depends on the value of the ' type ' parameter

Headers: optional, only when type 1 is used

Echo '

5.error_reporting (report_level): Set PHP error bounds and return to current level

Report_level, selectable values

1 or E_error: fatal error encountered during script run

2 or e_warning: Non-fatal run error

4 or E_parse: Compile-time parse error

8 or E_notice: Runtime notification, script discovery of a possible or error that occurs when a script is running normally

16 or e_core_error:php kernel-level error

32 or e_core_warning:php kernel-level warnings

64 or E_compile_error: Indicates compilation error

128 or E_compile_warning: Non-fatal compilation error

Any number of the above options can be connected (with OR or |) using "or" to report all required levels of error

Echo '

disabling error Reporting

error_reporting (0);

Report Run-time errors

Error_reporting (e_error| E_warning| E_parse);

Report All Errors

Error_reporting (E_all);

?>

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