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error.php
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<?php
/*
* Keruald, core libraries for Pluton and Xen engines.
* (c) 2010, Sébastien Santoro aka Dereckson, some rights reserved
* Released under BSD license
*
* Error handling
*
* 0.1 2010-02-27 16:00 DcK
*
* @todo add exception handling facilities
*
* There are 3 standard error types:
* - SQL_ERROR error during a sql query
* - HACK_ERROR error trying to access a protected resource
* - GENERAL_ERROR miscelleanous error
*
* The message_die/SQL_ERROR idea were found in phpBB 2 code.
*
* Tip: use HACK_ERROR when an user can't access a page, and edit message_die
* to output a login/pass form if the user isn't logged in, so the user
* will be invited to log in properly and legetimely access to the page.
* (cf. the Pluton's error.php for a sample)
*
* Tip: if you use a MVC model or at least templates, message_die should calls
* an error template but only if the template engine is initialized.
* (cf. the Xen's error.php for a sample)
*
* Tip: evaluate the cost/benefit to output a SQL error to the user and consider
* not to output the sql query or the error code to standard users.
*
* Tip: if you need more help to understand where exactly the error have occured
* consider Advanced PHP debugger: www.php.net/manual/en/book.apd.php
*/
//Error code constants
define
(
"SQL_ERROR"
,
65
);
define
(
"HACK_ERROR"
,
99
);
define
(
"GENERAL_ERROR"
,
117
);
/*
* Prints human-readable information about a variable
* wrapped in a general error and dies
* @param mixed $mixed the variable to dump
*/
function
dieprint_r
(
$var
,
$title
=
''
)
{
if
(!
$title
)
$title
=
'Debug'
;
//GENERAL_ERROR with print_r call as message
message_die
(
GENERAL_ERROR
,
'<pre>'
.
print_r
(
$var
,
true
)
.
'</pre>'
,
$title
);
}
/*
* Prints an error message and dies
* @param int $code A constant identifying the type of error (SQL_ERROR, HACK_ERROR or GENERAL_ERROR)
* @param string $text the error description
* @param string $text the error title
* @param int $line the file line the error have occured (typically __LINE__)
* @param string $file the file the error have occured (typically __FILE__)
* @param string $sql the sql query which caused the error
*/
function
message_die
(
$code
,
$text
=
''
,
$title
=
''
,
$line
=
''
,
$file
=
''
,
$sql
=
''
)
{
//Ensures we've an error text
$text
=
$text
?
$text
:
"An error have occured"
;
//Adds file and line information to error text
if
(
$file
)
{
$text
.=
" — $file"
;
if
(
$line
)
{
$text
.=
", line $line"
;
}
}
//Ensures we've an error title and adds relevant extra information
switch
(
$code
)
{
case
HACK_ERROR
:
$title
=
$title
?
$title
:
"Access non authorized"
;
break
;
case
SQL_ERROR
:
global
$db
;
$title
=
$title
?
$title
:
"SQL error"
;
//Gets SQL error information
$sqlError
=
$db
->
sql_error
();
if
(
$sqlError
[
'message'
]
!=
''
)
{
$text
.=
"<br />Error n° $sqlError[code]: $sqlError[message]"
;
}
$text
.=
'<br /> <br />Query: '
;
$text
.=
$sql
;
break
;
default
:
//TODO: here can be added code to handle error error ;-)
//Falls to GENERAL_ERROR
case
GENERAL_ERROR
:
$title
=
$title
?
$title
:
"General error"
;
break
;
}
//HTML output of $title and $text variables
echo
'<div class="FatalError"><p class="FatalErrorTitle">'
,
$title
,
'</p><p>'
,
$text
,
'</p></div>'
;
exit
;
}
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