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php-list's Introduction

Lists

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Installation

You can install library through Composer:

{
    "require": {
        "sokil/php-list": "dev-master"
    }
}

Priority Map

Priority map allows you to specify priority of items and iterate through this list in order to priority.

Add elements to list with priority:

<?php

$list = new \Sokil\DataType\PriorityMap();
$list->set('key1', 'value1', 10);
$list->set('key2', 'value2', 100);

Get elements according to priority:

<?php
foreach($list as $key => $value) {
    echo $key . ' - ' . $value;
}

// this will print
//   key2 - value2
//   key1 - value1

Get element by key:

<?php

$list = new \Sokil\DataType\PriorityMap();
$list->set('key1', 'value1', 10);
$list->get('key1');

Weight List

Weight list allows you to specify values and relative weights, and randomly get value according to it's weight.

Imagine that we have three database servers with ip addresses: 10.0.0.1, 10.0.0.2 and 10.0.0.3. We want to balance connections between nodes with weights 60%, 30% and 10%. So most connections goes to server 10.0.0.1, than to 10.0.0.2 and than to 10.0.0.3.

<?php

$list = new \Sokil\DataType\WeightList([
    '10.0.0.1' => 60,
    '10.0.0.2' => 30,
    '10.0.0.3' => 10,
]);

$ipAddress = $list->getRandomValue();

Now we have address on every request relatively to it's weight.

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