<?php

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class wfArray {

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private $data = "";

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private $size = 0;

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private $shiftPtr = 0;

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private $keys;

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public function __construct($keys){

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$this->keys = $keys;

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}

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public function push($val){ //associative array with keys that match those given to constructor

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foreach($this->keys as $key){

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$this->data .= pack('N', wfUtils::strlen($val[$key])) . $val[$key];

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}

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$this->size++;

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}

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public function shift(){ //If you alternately call push and shift you must periodically call collectGarbage() or ->data will keep growing

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$arr = array();

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if(wfUtils::strlen($this->data) < 1){ return null; }

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if($this->shiftPtr == wfUtils::strlen($this->data)){ return null; }

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foreach($this->keys as $key){

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$len = unpack('N', wfUtils::substr($this->data, $this->shiftPtr, 4));

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$len = $len[1];

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$arr[$key] = wfUtils::substr($this->data, $this->shiftPtr + 4, $len);

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$this->shiftPtr += 4 + $len;

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}

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if($this->shiftPtr == wfUtils::strlen($this->data)){ //garbage collection

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$this->data = ""; //we don't shorten with substr() because the assignment doubles peak mem

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$this->shiftPtr = 0;

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}

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$this->size--;

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return $arr;

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}

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public function collectGarbage(){ //only call collectGarbage if you're alternating between pushes and shifts and never emptying the array.

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//If you don't collect garbage then the data that is shifted is never freed

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$this->data = wfUtils::substr($this->data, $this->shiftPtr); //at this point memory usage doubles because of the = assignment (string copy is made), so try not to call collect garbage unless you have to.

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$this->shiftPtr = 0;

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}

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public function zero(){ //Rather call this instead of collect garbage because it's way more mem efficient.

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$this->data = "";

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$this->shiftPtr = 0;

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$this->size = 0;

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}

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public function size(){

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return $this->size;

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}

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}

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