PHP does not throw exception if mysqli is not enabled - php

Question

I have
<?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()
)
);
}
And if mysqli is not enabled then it does not catch the error:
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
What can I do so that it catches the error?
I have tried this one but it didn't work:
<?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()
)
);
}
This one does not halt, continues to execute the script.
{"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

It's odd that it wouldn't be installed but if you're rolling your own I guess it could be omitted. I would check to see if the procedural functions exist
if(!function_exists('mysqli_connect')) {
throw new Exception('mysqli is not enabled');
}

Answer 2

As the question is tagged php-7: An error in php 7 can be caught but it does not inherit from Exception so you have to catch them differently:
...
} catch (Error $e) {
^^^^^ Not Exception
echo json_encode(
array(
'msg' => $e->getMessage()
)
);
// stop execution
exit;
}
See the manual for more information about error handling in php 7.