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PHP Snippets

Stack class

By Andrej Kvasnica
on October 19, 2000

Version: 1.0

Type: Class

Category: Other

License: GNU General Public License

Description: Simple Stack class, implemented push, pop and simple stack display functions. 

// Stack class
// 19-oct-2000
// Andrej Kvasnica, JPD development Ltd.
// [email protected]
// v1.0

class Stack
{
	var $vals;
	var $amount;
	var $maximum;

	//constructor
	function Stack() {
		$this->amount=0;
		$this->maximum=0;
	}
	
	function push($number){
		if ($this->maximum > $this->amount){
			$this->vals[$this->amount]=$number;
		} else {
			$this->vals[]=$number;
			$this->maximum++;
		};
		$this->amount++;
		return $this->amount;
	}
	
	function pop(){
		if ($this->amount){
			$this->amount--;
			return $this->vals[$this->amount];
		} else {
			die("stack empty");
		};
	}
	
	function display($before,$after,$ending){
		for ($i=0; $i < $this->amount; $i++) {
			echo $before.$this->vals[$i].$after;
		};
		echo $ending;
	}
	
	function size(){
		return $this->amount;
	}
	
	function maxsize(){
		return $this->maximum;
	}
	
};

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