如果未启用 mysqli，PHP 不会抛出异常

Question

我有

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
require_once "configuration.php";
header('Content-Type: application/json');
try
{   
    $mysqli = new mysqli(MYSQL_SERVER, MYSQL_USERNAME, MYSQL_PASSWORD, MYSQL_DATABASE);
    $mysqli->set_charset("utf8");
} catch (Exception $e) {
    echo json_encode(
        array(
            'msg' => $e->getMessage()
        )
    );
}

如果 mysqli 未启用，则它不会捕获错误:

Fatal error: Uncaught Error: Class 'mysqli' not found in C:\test\db_connect.php:8
Stack trace:
#0 C:\test\getContacts.php(2): require_once()
#1 {main} thrown in C:\test\db_connect.php on line 8

我该怎么做才能捕获错误？

这个我试过了，但是没用:

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
require_once "configuration.php";
header('Content-Type: application/json');
try
{
    if(!extension_loaded('mysqli'))
    {
        throw new Exception('mysqli is not enabled');
    }

    $mysqli = new mysqli(MYSQL_SERVER, MYSQL_USERNAME, MYSQL_PASSWORD, MYSQL_DATABASE);
    $mysqli->set_charset("utf8");
} catch (Exception $e) {
    echo json_encode(
        array(
            'msg' => $e->getMessage()
        )
    );
}

这个并没有停顿，继续执行脚本。

{"msg":"mysqli is not enabled"}
Notice: Undefined variable: mysqli in C:\test\getContacts.php on line 99

Fatal error: Uncaught Error: Call to a member function query() on null in C:\test\getContacts.php:99 Stack trace: #0 {main} thrown in C:\test\getContacts.php on line 99

Answer 1

奇怪的是它不会被安装，但如果你自己安装，我想它可以被省略。我会检查程序函数是否存在

if(!function_exists('mysqli_connect')) {
    throw new Exception('mysqli is not enabled');
}