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<title>Runtime Configuration</title>
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<h2 class="title">Runtime Configuration</h2>
<p class="simpara">
The behaviour of these functions is affected by settings in <var class="filename">php.ini</var>.
</p>
<p class="para">
<table class="doctable table">
<caption><strong>PCRE Configuration Options</strong></caption>
<thead>
<tr>
<th>Name</th>
<th>Default</th>
<th>Changeable</th>
<th>Changelog</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td><a href="pcre.configuration.html#ini.pcre.backtrack-limit" class="link">pcre.backtrack_limit</a></td>
<td>"1000000"</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.2.0.</td>
</tr>
<tr>
<td><a href="pcre.configuration.html#ini.pcre.recursion-limit" class="link">pcre.recursion_limit</a></td>
<td>"100000"</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.2.0.</td>
</tr>
</tbody>
</table>
For further details and definitions of the
PHP_INI_* modes, see the <a href="configuration.changes.modes.html" class="xref">Where a configuration setting may be set</a>.
</p>
<p class="para">Here's a short explanation of
the configuration directives.</p>
<p class="para">
<dl>
<dt id="ini.pcre.backtrack-limit">
<span class="term">
<em><code class="parameter">pcre.backtrack_limit</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
PCRE's backtracking limit. Defaults to 100000 for PHP < 5.3.7.
</p>
</dd>
</dt>
<dt id="ini.pcre.recursion-limit">
<span class="term">
<em><code class="parameter">pcre.recursion_limit</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
PCRE's recursion limit. Please note that if you set this value to a high
number you may consume all the available process stack and eventually
crash PHP (due to reaching the stack size limit imposed by the Operating
System).
</p>
</dd>
</dt>
</dl>
</p>
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