Warning : php_network_getaddresses: getaddrinfo failed: No such host is known

Question

I know this same warning has been asked many times here. But in all the queries I saw some mistake in the program because of which the user was not able to access the database.

But in my case I am accessing directly using the user which has access rights to the database, but even then this warning is coming

php_network_getaddresses: getaddrinfo failed: No such host is known

<?php

$conn_error = 'Could not connect.';
$mysql_host  = 'localhost';
$mysql_user = 'root';
$mysql_pass = '';

$mysql_db = 'a_database';

if(!mysqli_connect('mysql_host','mysql_user','mysql_pass','mysql_db')){
die($conn_error);
}
else{
  echo 'connected';
}

It is giving the error message of not connected.

Although the users have the privilege to access the database.

Answer 1

You forgot to put the $ in (as variables)

if(!mysqli_connect('mysql_host','mysql_user','mysql_pass','mysql_db'))

those are being treated as strings.

• You're trying to connect to a host called "mysql_host", which is why it's not finding the intended "localhost" server address, as per $mysql_host = 'localhost'; .

Therefore, replace that with; while removing the quotes.

Sidenote: If you intend on putting the $ inside single quotes, it won't work. Variables do not get parsed in single quotes, but in double quotes, however they're not required here. Consult "references" below.

if(!mysqli_connect($mysql_host, $mysql_user, $mysql_pass, $mysql_db))

and this die($conn_error); (Could not connect.) doesn't help you.

This does:

• http://php.net/manual/en/mysqli.error.php

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Reference(s):

• https://php.net/language.types.string
• http://php.net/manual/en/language.variables.basics.php