sleep thread process

1 $str = 'w0';
2 for($w=0;$w<999999;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5 
6 }

1 $str = 'w1';
2 for($w=1000000;$w<1999999;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5 
6 }

1 $str = 'w0';
2 for($w=0;$w<60;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5 
6 }

1 $str = 'w1';
2 for($w=100;$w<160;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5 
6 }

1 $str = 'w1';
2 for($w=100;$w<160;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5     sleep(1);
6 }

1 $str = 'w0';
2 for($w=0;$w<60;$w++){
3     $sql = 'INSERT INTO w1 (wint,wchar) VALUES ('.$w.',"'.$str.'")';
4     mysqli_query($link,$sql);
5     sleep(1);
6 }