String Handling

Data Handling

XXXIV. Function Handling functions

Handling of binary data.

The example below shows the handling of internal exceptions by triggering errors and handling them with a user defined function

桶跡 1. LONGVARBINARY handling

XXVII. Error Handling and Logging Functions

ד 1. Using error handling in a script

ע Session handling was added in PHP 4.0.

Create a new PDF object, using default error handling and memory management.

Handling of LONG fields. Specifies the number of bytes returned to variables.

See the Connection Handling description in the Features chapter for a complete explanation.

你负责婚礼细节 You're handling the... details of the wedding.

醴翹 Extension Conventions Macros Memory Management Directory and File Functions String Handling Complex Types

Returns TRUE if client disconnected. See the Connection Handling description in the Features chapter for a complete explanation.

Returns the connection status bitfield. See the Connection Handling description in the Features chapter for a complete explanation.

This function sets whether a client disconnect should cause a script to be aborted. It will return the previous setting and can be called without an argument to not change the current setting and only return the current setting. See the Connection Handling section in the Features chapter for a complete description of connection handling in PHP.

These functions all manipulate strings in various ways. Some more specialized sections can be found in the regular expression and URL handling sections.

Regardless of the method of error handling, the ability to probe a system for errors leads to providing an attacker with more information.

For even more powerful string handling and manipulating functions take a look at the POSIX regular expression functions and the Perl compatible regular expression functions.

Do not print out any database specific information, especially about the schema, by fair means or foul. See also Error Reporting and Error Handling and Logging Functions.

The constant SID can also be used to retrieve the current name and session id as a string suitable for adding to URLs. Note that SID is only defined if the client didn't send the right cookie. See also Session handling.

Process Control support in PHP implements the Unix style of process creation, program execution, signal handling and process termination. Process Control should not be enabled within a webserver environment and unexpected results may happen if any Process Control functions are used within a webserver environment.

This function allows sending of emails with correct handling of Cc and Bcc receivers. The parameters to, cc and bcc are all strings and are all parsed as rfc822 address lists. The receivers specified in bcc will get the mail, but are excluded from the headers. Use the rpath parameter to specify return path. This is useful when using php as a mail client for multiple users.

The handling of a backslash followed by a digit other than 0 is complicated. Outside a character class, PCRE reads it and any following digits as a decimal number. If the number is less than 10, or if there have been at least that many previous capturing left parentheses in the expression, the entire sequence is taken as a back reference. A description of how this works is given later, following the discussion of parenthesized subpatterns.

You may plead that the attacker must possess a piece of information about the database schema in most examples. You are right, but you never know when and how it can be taken out, and if it happens, your database may be exposed. If you are using an open source, or publicly available database handling package, which may belong to a content management system or forum, the intruders easily produce a copy of a piece of your code. It may be also a security risk if it is a poorly designed one.