- $this->xchanged = $this->ychanged = array();
- $this->xv = $this->yv = array();
- $this->xind = $this->yind = array();
- $this->seq = array();
- $this->in_seq = array();
+ $this->xchanged = $this->ychanged = [];
+ $this->xv = $this->yv = [];
+ $this->xind = $this->yind = [];
+ $this->seq = [];
+ $this->in_seq = [];