????：<?php//加上@符 報錯信息不回顯示$db = @mysqli_connect('127.0.0.1','root','root','phpcn','3306','');//不加的話會顯示報錯的行數(shù)//$db = mysqli_connect('127.0.0.1','

<?php

//加上@符 報錯信息不回顯示

$db = @mysqli_connect('127.0.0.1','root','root','phpcn','3306','');

//不加的話會顯示報錯的行數(shù)

//$db = mysqli_connect('127.0.0.1','root','root1','phpcn','3306','');

//mysqli_connect_error() 輸出錯誤原因 不顯示第幾行

if(!$db){

exit('數(shù)據(jù)庫連接失敗'.mysqli_connect_error());

}

mysqli_close($db);

print_r($db);

?? ???：天蓬老師?? ??：2018-11-09 13:25:08
???? ??：數(shù)據(jù)庫的連接,建議將參數(shù)放在變量或常量中,這樣更好些