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：

The mysql extension is installed.
";
 } else {
  echo "
The mysql extension is not installed..
";
 }
 if (mysqliinstalled()){
  echo "
The mysqli extension is installed.
";
 } else {
  echo "
The mysqli extension is not installed..
";
 }
?>

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