mysql query does not get updated due to apostrophe sign

Question

$url = "example.com";
$data = json_decode($raw);
    $pname=$data->name;
$sql="UPDATE `client` SET pname='$pname' WHERE url='$url'";
    $query=mysql_query($sql,$link)or die(mysql_error());

When the json data is decoded, the value in variable $pname goes in client table. If there is an apostrophe sign (') in name then it throws an error. What changes can I make in the variable to send the name to database table?

example: Jerry get updated with no issues D'Cunha does not get updated as it has the apostrophe sign. The query becomes

"UPDATE `client` SET pname='D'Cunha' WHERE url='example.com'"

I found some articles but that does not say about how to find the apostrophe sign and change the variable value

Answer 1

use mysql_escape_string()

$sql="UPDATE `client` SET pname='".mysql_escape_string($pname)."' WHERE url='$url'";

and learn mysqli or PDO as mysql is deprciated and soon going to be drop