PHP - how to read big remote files efficiently and use buffer in loop

Question

i would like to understand how to use the buffer of a read file.

Assuming we have a big file with a list of emails line by line ( delimiter is a classic \\n

Answer 1

Don't use file_get_contents for large files. This pulls the entire file into memory all at once. You have to read it in pieces

$fp = fopen('file.txt', 'r');
while(!feof($fp)){
  //get onle line 
  $buffer = fgets($fp);
   //do your stuff
}
 fclose($fp);