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<title>Where a configuration setting may be set</title>
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<h2 class="title">Where a configuration setting may be set</h2>
<p class="para">
These modes determine when and where a PHP directive may or may not
be set, and each directive within the manual refers to one of these
modes. For example, some settings may be set within a PHP script
using <span class="function"><a href="function.ini-set.html" class="function">ini_set()</a></span>, whereas others may require
<var class="filename">php.ini</var> or <var class="filename">httpd.conf</var>.
</p>
<p class="para">
For example, the
<a href="outcontrol.configuration.html#ini.output-buffering" class="link">output_buffering</a> setting
is <em>PHP_INI_PERDIR</em> therefore it may not be set using
<span class="function"><a href="function.ini-set.html" class="function">ini_set()</a></span>. However, the
<a href="errorfunc.configuration.html#ini.display-errors" class="link">display_errors</a> directive is
<em>PHP_INI_ALL</em> therefore it may be set anywhere,
including with <span class="function"><a href="function.ini-set.html" class="function">ini_set()</a></span>.
</p>
<p class="para">
<table class="doctable table">
<caption><strong>Definition of PHP_INI_* modes</strong></caption>
<thead>
<tr>
<th>Mode</th>
<th>Meaning</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td><em>PHP_INI_USER</em></td>
<td>
Entry can be set in user scripts (like with <span class="function"><a href="function.ini-set.html" class="function">ini_set()</a></span>)
or in the <a href="configuration.changes.html#configuration.changes.windows" class="link">Windows registry</a>.
Since PHP 5.3, entry can be set in <var class="filename">.user.ini</var>
</td>
</tr>
<tr>
<td><em>PHP_INI_PERDIR</em></td>
<td>
Entry can be set in <var class="filename">php.ini</var>, <var class="filename">.htaccess</var>, <var class="filename">httpd.conf</var> or <var class="filename">.user.ini</var>
(since PHP 5.3)
</td>
</tr>
<tr>
<td><em>PHP_INI_SYSTEM</em></td>
<td>Entry can be set in <var class="filename">php.ini</var> or <var class="filename">httpd.conf</var></td>
</tr>
<tr>
<td><em>PHP_INI_ALL</em></td>
<td>Entry can be set anywhere</td>
</tr>
</tbody>
</table>
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