sleep thread process

 $str = 'w0';
 for($w=0;$w<999999;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);

 }

 $str = 'w1';
 for($w=1000000;$w<1999999;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);

 }

 $str = 'w0';
 for($w=0;$w<60;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);

 }

 $str = 'w1';
 for($w=100;$w<160;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);

 }

 $str = 'w1';
 for($w=100;$w<160;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);
     sleep(1);
 }

 $str = 'w0';
 for($w=0;$w<60;$w++){
     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
     mysqli_query($link,$sql);
     sleep(1);
 }