如何判断php mysqli扩展类是否开启

如何判断php mysqli扩展类是否开启
php判断mysqli扩展类是否开启,源码如下：

<?php /* by http://www.manongjc.com/article/1206.html */ function mysqlinstalled （）{if （function_exists （"mysql_connect"））{ return true;} else { return false;} } function mysqliinstalled （）{if （function_exists （"mysqli_connect"））{ return true;} else { return false;} }if （mysqlinstalled（））{echo "<p>The mysql extension is installed.</p>"; } else {echo "<p>The mysql extension is not installed..</p>"; } if （mysqliinstalled（））{echo "<p>The mysqli extension is installed.</p>"; } else {echo "<p>The mysqli extension is not installed..</p>"; }?>

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