How to delete a line from a file with php?

Question

I have a file called $dir and a string called $line which I know is the complete line of the file , but I don't know its line number and I want to delete it from the file, what should I do?

Can I use awk?

Answer 1

Read lines one by one and write all but the matching lines to another file. Then replace the original file.

Answer 2

$contents = file_get_contents($dir);
$contents = str_replace($line, '', $contents);
file_put_contents($dir, $contents);