将缓冲区转换为数组

Question

我正准备memcached着

$memcached->set("item" , ["1" => "hello"]);

任何在PHP中工作,

在带有memcached插件的Node.js中,我得到一个缓冲区而不是结果中的数组

<Buffer 61 3a 25 61 34 3a>

我无法将这种缓冲区转换为数组

在Node.js中:

memcached.get("item" , function(err, data) {
  console.log(data);
}

你有什么办法吗？

Answer 1

arr = [...buffer]

除了缓冲区之外,ES6还引入了许多其他功能.

你甚至可以像这样轻松追加:

arr.push(...buffer)

...在数组中使用时,运算符会扩展数组和缓冲区等可枚举项.它还将它们扩展为单独的函数参数.

是的,它也更快:

...:x100000:835.850ms

来自原型的切片调用:x100000:2118.513ms

var array,
    buffer = new Buffer([1, 4, 4, 5, 6, 7, 5, 3, 5, 67, 7, 4, 3, 5, 76, 234, 24, 235, 24, 4, 234, 234, 234, 325, 32, 6246, 8, 89, 689, 7687, 56, 54, 643, 32, 213, 2134, 235, 346, 45756, 857, 987, 0790, 89, 57, 5, 32, 423, 54, 6, 765, 65, 745, 4, 34, 543, 43, 3, 3, 3, 34, 3, 63, 63, 35, 7, 537, 35, 75, 754, 7, 23, 234, 43, 6, 247, 35, 54, 745, 767, 5, 3, 2, 2, 6, 7, 32, 3, 56, 346, 4, 32, 32, 3, 4, 45, 5, 34, 45, 43, 43]),
    iter = 100000;

array = buffer;

console.time("... : x" + iter);
for (var i = iter; i--;) array = [...buffer]
console.timeEnd("... : x" + iter);

console.time("Apply/call/etc : x" + iter);
for (var i = iter; i--;) array = Array.prototype.slice.call(buffer, 0)
console.timeEnd("Apply/call/etc : x" + iter);

Answer 2

还有另一种方法可以转换为整数数组

使用toJSON()

Buffer.from('Text of example').toJSON()
{ type: 'Buffer',data: [ 84, 101, 120, 116, 32, 111, 102, 32, 101, 120, 97, 109, 112, 108, 101 ] }

// simple get data
Buffer.from('Text of example').toJSON().data
[ 84, 101, 120, 116, 32, 111, 102, 32, 101, 120, 97, 109, 112, 108, 101 ]

基准示例

// I took this from @user4584267's answer
const buffer = new Buffer([1, 4, 4, 5, 6, 7, 5, 3, 5, 67, 7, 4, 3, 5, 76, 234, 24, 235, 24, 4, 234, 234, 234, 325, 32, 6246, 8, 89, 689, 7687, 56, 54, 643, 32, 213, 2134, 235, 346, 45756, 857, 987, 0790, 89, 57, 5, 32, 423, 54, 6, 765, 65, 745, 4, 34, 543, 43, 3, 3, 3, 34, 3, 63, 63, 35, 7, 537, 35, 75, 754, 7, 23, 234, 43, 6, 247, 35, 54, 745, 767, 5, 3, 2, 2, 6, 7, 32, 3, 56, 346, 4, 32, 32, 3, 4, 45, 5, 34, 45, 43, 43]);
let array = null;
const iterations = 100000;

console.time("...buffer");
for (let i = iterations; i=i-1;) array = [...buffer]
console.timeEnd("...buffer");

console.time("array.prototype.slice.call");
for (let i = iterations; i=i-1;) array = Array.prototype.slice.call(buffer, 0)
console.timeEnd("array.prototype.slice.call");

console.time("toJSON().data");
for (let i = iterations; i=i-1;) array = buffer.toJSON().data
console.timeEnd("toJSON().data");

输出

...缓冲：559.932ms
array.prototype.slice.call：1176.535ms
的toJSON（）数据：30.571ms

或者，如果您想在 Buffer 中使用更多专业和自定义功能，请使用：

Buffer.prototype.toArrayInteger = function(){
    if (this.length > 0) {
        const data = new Array(this.length);
        for (let i = 0; i < this.length; i=i+1)
            data[i] = this[i];
        return data;
    }
    return [];
}

基准示例：

const buffer = new Buffer([1, 4, 4, 5, 6, 7, 5, 3, 5, 67, 7, 4, 3, 5, 76, 234, 24, 235, 24, 4, 234, 234, 234, 325, 32, 6246, 8, 89, 689, 7687, 56, 54, 643, 32, 213, 2134, 235, 346, 45756, 857, 987, 0790, 89, 57, 5, 32, 423, 54, 6, 765, 65, 745, 4, 34, 543, 43, 3, 3, 3, 34, 3, 63, 63, 35, 7, 537, 35, 75, 754, 7, 23, 234, 43, 6, 247, 35, 54, 745, 767, 5, 3, 2, 2, 6, 7, 32, 3, 56, 346, 4, 32, 32, 3, 4, 45, 5, 34, 45, 43, 43]);
let array = null;
const iterations = 100000;

console.time("toArrayInteger");
for (let i = iterations; i=i-1;) buffer.toArrayInteger();
console.timeEnd("toArrayInteger");

输出：

toArrayInteger：28.714ms

注意：在上一个示例中，我从Buffer.toJSON复制了一个函数并将其自定义为 lite

Answer 3

干得好:

var buffer = new Buffer([1,2,3])
var arr = Array.prototype.slice.call(buffer, 0)
console.log(arr)

Answer 4

在interent上，没有这方面的信息，但我找到了转换方法

在nodejs中，我必须使用：

var arrayobject = phpjs.unserialize(data.toString());

但是，这是获取数组的非常愚蠢的方法，似乎php在设置memcache时序列化了数据。