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XXXIX. Miscellaneous Functions
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Miscellaneous Functions

This chapter discusses a variety of functions that don't really fit neatly into existing categories, but that we felt were too important and useful to leave out of this book. Accordingly, we'll simply categorize them as "miscellaneous."

OverviewThis section contains functions for the following tasks:

Working with constants

constant() - Returning the value of a constant

define() - Defining a named constant

defined() - Checking whether a given named constant exists
Ending script execution

die() - Outputting a message and terminating the current script

exit() - Terminating the current script
Evaluating strings as PHP code

eval() - Evaluating a string as PHP code
Retrieving information about the capabilities of a browser

get_browser() - Telling what the user's browser is capable of
Performing syntax highlighting for PHP

highlight_file() - Syntax highlighting of a file

highlight_string() - Syntax highlighting of a string

show_source() - Syntax highlighting of a file
Parsing IPTC blocks

iptcparse() - Parses a binary IPTC http://www.iptc.org/ block into single tags
Leaking memory

leak() - Leaks memory
Delaying the execution of a script

sleep() - Delays execution

usleep() - Delays execution in microseconds

Configuring the Miscellaneous FunctionsNo configuration directives currently affect how the miscellaneous functions work.

Installing Miscellaneous Function SupportThe Miscellaneous functions are built into PHP by default. If desired, individual functions can be disabled in the php.ini file via the disable_functions directive.

Table of Contents

define
defined
die
eval
exit
get_browser
highlight_file
highlight_string
iptcparse
leak
sleep
usleep

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PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.