42 lines
866 B
PHP
42 lines
866 B
PHP
<?php
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class Queue {
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private $capacity;
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private $size;
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private $head;
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private $tail;
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private $arr;
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function Queue($capacity) {
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$this->capacity = $capacity;
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$this->size = 0;
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$this->head = 0;
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$this->tail = 0;
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}
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function getSize() {
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return $this->size;
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}
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function clear() {
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$this->size = 0;
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$this->head = 0;
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$this->tail = 0;
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}
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function push($value) {
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if($this->size >= $this->capacity) return;
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$this->arr[$this->tail] = $value;
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$this->tail = ($this->tail + 1) % $this->capacity;
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$this->size++;
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}
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function pop() {
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if($this->size <= 0) return null;
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$value = $this->arr[$this->head];
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$this->head = ($this->head + 1) % $this->capacity;
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$this->size--;
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return $value;
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}
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}
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?>
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