PHP Find String in CSV file

Question

I\'ve got a large flat file of usernames and emails in the following format:

\"username\", \"email\"
\"username\", \"email\"
\"username\", \"email\"
<         


        

Answer 1

I truly believe that all examples in other answers works!
But all they are slow, because all of them travers each line in csv file...
I have another example how to find desired string:

$command = sprintf("grep '%s,%s' -Er %s", $userName, $email, $file);
$result = `$command`;

Yes it some kind of dark matter, but it really works and it really fast!