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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