如何判断php mysqli扩展类是否开启

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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：

<"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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如何判断php,mysqli扩展类开启,判断php,mysqli扩展类开启

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