$read = fopen($textfile,"r");
$file = fread($read,filesize($textfile));
fclose($textfile);

$lines = explode ("\n", $file);

foreach ($lines as $line) { 
  list($a,$b,$c,$d) = explode(',',$line);
  echo "$a $b $c $d";
}

Open a comma delimited text file then read each line and break apart by delimiter

Files - Opening & Reading

PHP