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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>MySQLi 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="mysqli.configuration.html#ini.mysqli.allow-local-infile" class="link">mysqli.allow_local_infile</a></td>
<td>"1"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 5.2.4.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.allow-persistent" class="link">mysqli.allow_persistent</a></td>
<td>"1"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 5.3.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.max-persistent" class="link">mysqli.max_persistent</a></td>
<td>"-1"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 5.3.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.max-links" class="link">mysqli.max_links</a></td>
<td>"-1"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.default-port" class="link">mysqli.default_port</a></td>
<td>"3306"</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.default-socket" class="link">mysqli.default_socket</a></td>
<td>NULL</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.default-host" class="link">mysqli.default_host</a></td>
<td>NULL</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.default-user" class="link">mysqli.default_user</a></td>
<td>NULL</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.default-pw" class="link">mysqli.default_pw</a></td>
<td>NULL</td>
<td>PHP_INI_ALL</td>
<td>Available since PHP 5.0.0.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.reconnect" class="link">mysqli.reconnect</a></td>
<td>"0"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 4.3.5.</td>
</tr>
<tr>
<td><a href="mysqli.configuration.html#ini.mysqli.cache-size" class="link">mysqli.cache_size</a></td>
<td>"2000"</td>
<td>PHP_INI_SYSTEM</td>
<td>Available since PHP 5.3.0.</td>
</tr>
</tbody>
</table>
</p>
<p class="para">
For further details and definitions of the preceding PHP_INI_* constants, see
the chapter on <a href="configuration.changes.html" class="link">configuration
changes</a>.
</p>
<p class="para">Here's a short explanation of
the configuration directives.</p>
<p class="para">
<dl>
<dt id="ini.mysqli.allow-local-infile">
<span class="term">
<em><code class="parameter">mysqli.allow_local_infile</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
Allow accessing, from PHP's perspective, local files with LOAD DATA
statements
</p>
</dd>
</dt>
<dt id="ini.mysqli.allow-persistent">
<span class="term">
<em><code class="parameter">mysqli.allow_persistent</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
Enable the ability to create persistent connections using
<span class="function"><a href="function.mysqli-connect.html" class="function">mysqli_connect()</a></span>.
</p>
</dd>
</dt>
<dt id="ini.mysqli.max-persistent">
<span class="term">
<em><code class="parameter">mysqli.max_persistent</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
Maximum of persistent connections that can be made. Set to
0 for unlimited.
</p>
</dd>
</dt>
<dt id="ini.mysqli.max-links">
<span class="term">
<em><code class="parameter">mysqli.max_links</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
The maximum number of MySQL connections per process.
</p>
</dd>
</dt>
<dt id="ini.mysqli.default-port">
<span class="term">
<em><code class="parameter">mysqli.default_port</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
The default TCP port number to use when connecting to
the database server if no other port is specified. If
no default is specified, the port will be obtained
from the <em>MYSQL_TCP_PORT</em> environment
variable, the <em>mysql-tcp</em> entry in
<var class="filename">/etc/services</var> or the compile-time
<em>MYSQL_PORT</em> constant, in that order. Win32
will only use the <em>MYSQL_PORT</em> constant.
</p>
</dd>
</dt>
<dt id="ini.mysqli.default-socket">
<span class="term">
<em><code class="parameter">mysqli.default_socket</code></em>
<span class="type"><a href="language.types.string.html" class="type string">string</a></span>
</span>
<dd>
<p class="para">
The default socket name to use when connecting to a local
database server if no other socket name is specified.
</p>
</dd>
</dt>
<dt id="ini.mysqli.default-host">
<span class="term">
<em><code class="parameter">mysqli.default_host</code></em>
<span class="type"><a href="language.types.string.html" class="type string">string</a></span>
</span>
<dd>
<p class="para">
The default server host to use when connecting to the database
server if no other host is specified. Doesn't apply in
<a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">safe mode</a>.
</p>
</dd>
</dt>
<dt id="ini.mysqli.default-user">
<span class="term">
<em><code class="parameter">mysqli.default_user</code></em>
<span class="type"><a href="language.types.string.html" class="type string">string</a></span>
</span>
<dd>
<p class="para">
The default user name to use when connecting to the database
server if no other name is specified. Doesn't apply in
<a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">safe mode</a>.
</p>
</dd>
</dt>
<dt id="ini.mysqli.default-pw">
<span class="term">
<em><code class="parameter">mysqli.default_pw</code></em>
<span class="type"><a href="language.types.string.html" class="type string">string</a></span>
</span>
<dd>
<p class="para">
The default password to use when connecting to the database
server if no other password is specified. Doesn't apply in
<a href="ini.sect.safe-mode.html#ini.safe-mode" class="link">safe mode</a>.
</p>
</dd>
</dt>
<dt id="ini.mysqli.reconnect">
<span class="term">
<em><code class="parameter">mysqli.reconnect</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
Automatically reconnect if the connection was lost.
</p>
</dd>
</dt>
<dt id="ini.mysqli.cache-size">
<span class="term">
<em><code class="parameter">mysqli.cache_size</code></em>
<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>
</span>
<dd>
<p class="para">
Available only with <a href="book.mysqlnd.html" class="link">mysqlnd</a>.
</p>
</dd>
</dt>
</dl>
</p>
<p class="para">
Users cannot set <em>MYSQL_OPT_READ_TIMEOUT</em> through an API
call or runtime configuration setting. Note that if it were possible there
would be differences between how <em>libmysqlclient</em> and
streams would interpret the value of <em>MYSQL_OPT_READ_TIMEOUT</em>.
</p>
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