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 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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