Reading file PHP using too much memory -

so, i'm trying parse text file has 24mb , 314134 lines. problem is, feel script using way memory.

this code:

if(file_exists($filepath)) {             $data = file_get_contents($filepath);              $lines = explode("\n", $data);             foreach ($lines $line) {                 //split line.                 $spllitedline = explode(';', utf8_encode($line));                  //get fields index.                 $localidade = !empty($spllitedline[3]) ? $spllitedline[3] : '';                 $codigo_postal = $spllitedline[14] . '-' . $spllitedline[15];                  $morada = (!empty($spllitedline[5]) ? $spllitedline[5] : ' ') . ' ' .                     (!empty($spllitedline[6]) ? $spllitedline[6] : ' ') . ' ' .                     (!empty($spllitedline[7]) ? $spllitedline[7] : ' ') . ' ' .                     (!empty($spllitedline[8]) ? $spllitedline[8] : ' ') . ' ' .                     (!empty($spllitedline[9]) ? $spllitedline[9] : '');                  //create new ctt location , save database.                 $location = new cttlocations();                 $location->address = preg_replace('/\s\s+/', ' ', $morada);                 $location->location = $localidade;                 $location->zipcode = $codigo_postal;                 $location->save(false);                  //unset variables free space.                 unset($location);                 unset($line);                 unset($morada);             }         } 

this using 153mb of memory , it's not in half of file. i've read using fopen() fgets() , fclose() it's better solution using same amount of memory methods. doing wrong? thought unsetting variables free needed space. think 150mb way operation this. thouhgts?

this :

 $data = file_get_contents($filepath); 

is way heavy big files.

this how read file line line :

$handle = fopen("inputfile.txt", "r"); if ($handle) {     while (($line = fgets($handle)) !== false) {         // process line read.     }      fclose($handle); } else {     // error opening file. }