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2 jpm 1 
<?php
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class Line {
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	public $p1;
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	public $p2;
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	public function __construct(Vector $p1,Vector $p2) {
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		$this->p1 = $p1;
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		$this->p2 = $p2;
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	}
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	public function LengthSquared() {
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		$dx = $this->p1->x - $this->p2->x;
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		$dy = $this->p1->y - $this->p2->y;
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		return $dx*$dx + $dy*$dy;
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	}
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	public function DistanceToPointSquared(Vector $point) {
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		$v = new Vector($point->x - $this->p1->x, $point->y - $this->p1->y);
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		$l = new Vector($this->p2->x - $this->p1->x, $this->p2->y - $this->p1->y);
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		$dot = $v->DotProduct($l->UnitVector());
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		if ($dot <= 0) {// Point nearest P1
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			$dl = new Line($this->p1, $point);
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			return $dl->LengthSquared();
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		}
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		if (($dot*$dot)>=$this->LengthSquared()) {// Point nearest P2
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			$dl = new Line($this->p2, $point);
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			return $dl->LengthSquared();
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		} else {// Point within line
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			$v2 = new Line($this->p1, $point);
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			$h = $v2->LengthSquared();
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			return $h - $dot * $dot;
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		}
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	}
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}
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?>