Miscellaneous configuration directives
This is not a complete list of PHP directives.
Directives are listed in their appropriate locations so
for example information on session directives is located
in the sessions chapter.
Httpd Options
Table 4-2. Httpd Options
| Name |
Default |
Changeable |
| async_send |
"0" |
PHP_INI_ALL |
Language Options
Table 4-3. Language and Misc Configuration Options
| Name |
Default |
Changeable |
| short_open_tag |
On |
PHP_INI_SYSTEM|PHP_INI_PERDIR |
| asp_tags |
Off |
PHP_INI_SYSTEM|PHP_INI_PERDIR |
| precision |
"14" |
PHP_INI_ALL |
| y2k_compliance |
Off |
PHP_INI_ALL |
| allow_call_time_pass_reference |
On |
PHP_INI_SYSTEM|PHP_INI_PERDIR |
| expose_php |
On |
PHP_INI_SYSTEM |
Here's a short explanation of the configuration directives.
- short_open_tag boolean
-
Tells whether the short form (<?
?>) of PHP's open tag should be allowed. If you want to use PHP in combination
with XML, you can disable this option in order to
use <?xml ?> inline. Otherwise, you can print it with PHP, for example: <?php
echo '<?xml version="1.0"'; ?>. Also if disabled, you must use the long form of the PHP open tag (<?php
?>).
Note: This directive also affects the shorthand <?=, which is identical to <? echo. Use of this shortcut requires short_open_tag to be on.
- asp_tags boolean
-
Enables the use of ASP-like <% %>
tags in addition to the usual <?php ?> tags.
This includes the variable-value printing shorthand
of <%= $value %>. For more information,
see Escaping from HTML.
Note: Support for ASP-style tags was added in 3.0.4.
- precision integer
-
The number of significant digits displayed
in floating point numbers.
- y2k_compliance boolean
-
Enforce year 2000 compliance (will cause
problems with non-compliant browsers)
- allow_call_time_pass_reference boolean
-
Whether to enable the ability to force
arguments to be passed by reference at function
call time. This method is deprecated and is likely
to be unsupported in future versions of PHP/Zend.
The encouraged method of specifying which arguments
should be passed by reference is in the function
declaration. You're encouraged to try and turn this
option Off and make sure your scripts work properly
with it in order to ensure they will work with future
versions of the language (you will receive a warning
each time you use this feature, and the argument
will be passed by value instead of by reference).
See also References Explained.
- expose_php boolean
-
Decides whether PHP may expose the fact
that it is installed on the server (e.g. by adding
its signature to the Web server header). It is no
security threat in any way, but it makes it possible
to determine whether you use PHP on your server
or not.
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