PHP script to split large text file into multiple files -

i struggling create php script split large text file multiple smaller files based on number of lines. need option increment split, starts 10 lines on first file, 20 lines on second , on.

here 1 function scripts:

<?php /**  *  * split large files smaller ones  * @param string $source source file  * @param string $targetpath target directory saving files  * @param int $lines number of lines split  * @return void  */ function split_file($source, $targetpath='./logs/', $lines=10){     $i=0;     $j=1;     $date = date("m-d-y");     $buffer='';      $handle = @fopen ($source, "r");     while (!feof ($handle)) {         $buffer .= @fgets($handle, 4096);         $i++;         if ($i >= $lines) {             $fname = $targetpath.".part_".$date.$j.".log";             if (!$fhandle = @fopen($fname, 'w')) {                 echo "cannot open file ($fname)";                 exit;             }              if (!@fwrite($fhandle, $buffer)) {                 echo "cannot write file ($fname)";                 exit;             }             fclose($fhandle);             $j++;             $buffer='';             $i=0;             $line+=10; // add 10 $lines after each iteration. modify line required         }     }     fclose ($handle); } ?>