PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

530 Chapter 24 Other Useful Features
The ini_get() function simply checks the value of a particular configuration directive.The
directive name should be passed to it as a string. Here, it just checks that the
value really did change.
Not all INI options can be set this way. Each option has a level at which it can be set.
The possible levels are
n PHP_INI_USER—You can change these values in your scripts with ini_set().
n PHP_INI_PERDIR—You can change these values in php.ini or in .htaccess or
httpd.conf files if using Apache.The fact that you can change them in .htaccess
files means that you can change these values on a per-directory basis—hence the
name.
n PHP_INI_SYSTEM—You can change these values in the php.ini or httpd.conf
files.
n PHP_INI_ALL—You can change these values in any of the preceding ways—that is,
in a script, in an .htaccess file, or in your httpd.conf or php.ini files.
The full set of ini options and the levels at which they can be set is in the PHP manual
at http://www.php.net/ini_set.
Highlighting Source Code
PHP comes with a built-in syntax highlighter, similar to many IDEs. In particular, it is
useful for sharing code with others or presenting it for discussion on a web page.
The functions show_source() and highlight_file() are the same. (The
show_source() function is actually an alias for highlight_file().) Both of these functions
accept a filename as the parameter. (This file should be a PHP file; otherwise, you
won’t get a very meaningful result.) Consider this example:
show_source(‘list_functions.php’);
The file is echoed to the browser with the text highlighted in various colors depending
on whether it is a string, a comment, a keyword, or HTML.The output is printed on a
background color. Content that doesn’t fit into any of these categories is printed in a
default color.
The highlight_string() function works similarly, but it takes a string as parameter
and prints it to the browser in a syntax-highlighted format.
You can set the colors for syntax highlighting in your php.ini file.The section you
want to change looks like this:
; Colors for Syntax Highlighting mode
highlight.string = #DD0000
highlight.comment = #FF9900
highlight.keyword = #007700