Source of: /manual/en/configuration.changes.modes.php
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<div id="configuration.changes.modes" class="sect1">
<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 <a href="function.ini-set.php" class="function">ini_set()</a>, 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.php#ini.output-buffering" class="link">output_buffering</a> setting
is <i>PHP_INI_PERDIR</i> therefore it may not be set using
<a href="function.ini-set.php" class="function">ini_set()</a>. However, the
<a href="errorfunc.configuration.php#ini.display-errors" class="link">display_errors</a> directive is
<i>PHP_INI_ALL</i> therefore it may be set anywhere,
including with <a href="function.ini-set.php" class="function">ini_set()</a>.
</p>
<p class="para">
</p><table class="doctable table">
<caption><b>Definition of PHP_INI_* modes</b></caption>
<thead valign="middle">
<tr valign="middle">
<th>Mode</th>
<th>Value</th>
<th>Meaning</th>
</tr>
</thead>
<tbody valign="middle" class="tbody">
<tr valign="middle">
<td align="left"><i>PHP_INI_USER</i></td>
<td align="left">1</td>
<td align="left">
Entry can be set in user scripts (like with <a href="function.ini-set.php" class="function">ini_set()</a>)
or in the <a href="configuration.changes.php#configuration.changes.windows" class="link">Windows registry</a>
</td>
</tr>
<tr valign="middle">
<td align="left"><i>PHP_INI_PERDIR</i></td>
<td align="left">6</td>
<td align="left">Entry can be set in <var class="filename">php.ini</var>, <var class="filename">.htaccess</var> or <var class="filename">httpd.conf</var></td>
</tr>
<tr valign="middle">
<td align="left"><i>PHP_INI_SYSTEM</i></td>
<td align="left">4</td>
<td align="left">Entry can be set in <var class="filename">php.ini</var> or <var class="filename">httpd.conf</var></td>
</tr>
<tr valign="middle">
<td align="left"><i>PHP_INI_ALL</i></td>
<td align="left">7</td>
<td align="left">Entry can be set anywhere</td>
</tr>
</tbody>
</table>
<p>
</p>
</div><?php manual_footer(); ?>
