PHP code example of tonix-tuft / linked-hash-map

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

tonix-tuft / linked-hash-map example snippets

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map['abc'] = 'string (abc)';
$map['abcdef'] = 'string (abcdef)';
$map[123] = 'int (123)';

var_dump(count($map)); // 3

foreach ($map as $key => $value) {
  var_dump($key, $value);
}

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map[true] = 'bool (true)';
$map[false] = 'bool (false)';
$map[32441] = 'int (32441)';
$map[-32441] = 'int (-32441)';
$map[2147483647] = 'int (2147483647)';
$map[-2147483648] = 'int (-2147483648)';
$map[PHP_INT_MAX - 100] = 'int (PHP_INT_MAX - 100)';
$map[PHP_INT_MIN] = 'int (PHP_INT_MIN)';
$map[0.5] = 'float/double (0.5)';
$map[-0.5] = 'float/double (-0.5)';
$map[123891.73] = 'float/double (123891.73)';
$map[-123891.73] = 'float/double (-123891.73)';
$map[PHP_INT_MAX + 10] = 'float/double (PHP_INT_MAX + 10)';
$map[PHP_INT_MIN - 10] = 'float/double (PHP_INT_MIN - 10)';
$map['abc'] = 'string (abc)';
$map["abcdef"] = "string (abcdef)";
$map['hfudsh873hu2ifl'] = "string (hfudsh873hu2ifl)";
$map["The quick brown fox jumps over the lazy dog"] =
  'string (The quick brown fox jumps over the lazy dog)';
$map[[1, 2, 3]] = 'array ([1, 2, 3])';
$map[['a', 'b', 'c']] = "array (['a', 'b', 'c'])";
$map[[1, 'a', false, 5, true, [1, 2, 3, ['f', 5, []]]]] =
  "array ([1, 'a', false, 5, true, [1, 2, 3, ['f', 5, []]]])";

$arrayKey = [
  1,
  'a',
  false,
  5,
  true,
  [1, 2, 3, ['f', 5, [new stdClass(), new stdClass()]]],
  new ArrayIterator(),
];
$map[$arrayKey] =
  "array ([1, 'a', false, 5, true, [1, 2, 3, ['f', 5, [new stdClass(), new stdClass()]]], new ArrayIterator()])";

$stdClassObj = new stdClass();
$map[$stdClassObj] = "object (new stdClass())";

$arrayIterator = new ArrayIterator();
$map[$arrayIterator] = "object (new ArrayIterator())";

class A {
}
$objA = new A();
$map[$objA] = "object (new A())";

$fp = fopen(__DIR__ . '/private_local_file', 'w');
$map[$fp] = "resource (fopen())";

$ch = curl_init();
$map[$ch] = "resource (curl_init())";

// All the values can be retrieved later using the corresponding key, e.g.:
var_dump($map[[1, 2, 3]]); // "array ([1, 2, 3])"
var_dump($map[$objA]); // "object (new A())"
var_dump($map[$ch]); // "resource (curl_init())"

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map[1.5] = 'A value for key 1.5';
var_dump($map[1.5]); // "A value for key 1.5"
var_dump($map[1]); // NULL

$arr = [];
$arr[1.5] = 'A value'; // [1 => "A value"];
var_dump($arr[1.5]); // "A value"
var_dump($arr[1]); // "A value"

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map->setInsertMode(LinkedHashMap::INSERT_MODE_PREPEND); // Defaults to `LinkedHashMap::INSERT_MODE_APPEND`
$map['a'] = 1;
$map['b'] = 2;

foreach ($map as $key => $value) {
  var_dump($key, $value);
}
// 'b', 2
// 'a', 1

use LinkedHashMap\LinkedHashMap;

// Example 1:
$map = new LinkedHashMap();
$map->setLoopOrder(LinkedHashMap::LOOP_ORDER_REVERSE); // Defaults to `LinkedHashMap::LOOP_ORDER_NORMAL`
$map['a'] = 1;
$map['b'] = 2;

foreach ($map as $key => $value) {
  var_dump($key, $value);
}
// 'b', 2
// 'a', 1

// Example 2:
$map = new LinkedHashMap();
$map->setInsertMode(LinkedHashMap::INSERT_MODE_PREPEND); // Defaults to `LinkedHashMap::INSERT_MODE_APPEND`
$map->setLoopOrder(LinkedHashMap::LOOP_ORDER_REVERSE); // Defaults to `LinkedHashMap::LOOP_ORDER_NORMAL`
$map['a'] = 1;
$map['b'] = 2;

foreach ($map as $key => $value) {
  var_dump($key, $value);
}
// 'a', 1
// 'b', 2

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map[] = 'Value for index 0';
$map[] = 'Value for index 1';
$map[1234] = 'Value for index 1234';
$map[] = 'Value for index 1235';
var_dump($map[0]); // "Value for index 0"
var_dump($map[1]); // "Value for index 1"
var_dump($map[2]); // NULL (no E_NOTICE/E_USER_NOTICE)
var_dump($map[1234]); // "Value for index 1234"
var_dump($map[1235]); // "Value for index 1235"

$arr = [];
$arr[] = 'Value for index 0';
$arr[] = 'Value for index 1';
$arr[1234] = 'Value for index 1234';
$arr[] = 'Value for index 1235';
var_dump($arr[0]); // "Value for index 0"
var_dump($arr[1]); // "Value for index 1"
var_dump($arr[2]); // NULL (emits E_NOTICE)
var_dump($arr[1234]); // "Value for index 1234"
var_dump($arr[1235]); // "Value for index 1235"

use LinkedHashMap\LinkedHashMap;

$map = new LinkedHashMap();
$map[null] = 'Value for index 0';
$map[null] = 'Value for index 1';
$map[1234] = 'Value for index 1234';
$map[null] = 'Value for index 1235';
var_dump($map[0]); // "Value for index 0"
var_dump($map[1]); // "Value for index 1"
var_dump($map[1234]); // "Value for index 1234"
var_dump($map[1235]); // "Value for index 1235"
var_dump($map[null]); // NULL
var_dump($map['']); // NULL

$arr = [];
$arr[null] = 'Value for index 0';
$arr[null] = 'Value for index 1';
$arr[1234] = 'Value for index 1234';
$arr[null] = 'Value for index 1235';
var_dump($arr[0]); // NULL (emits E_NOTICE)
var_dump($arr[1]); // NULL (emits E_NOTICE)
var_dump($arr[1234]); // "Value for index 1234"
var_dump($arr[1235]); // NULL (emits E_NOTICE)
var_dump($arr[null]); // "Value for index 1235"
var_dump($arr['']); // "Value for index 1235"

use LinkedHashMap\LinkedHashMap;
use LinkedHashMap\HashCodeInterface;

class ClassWithCustomHashCode implements HashCodeInterface {
  /**
   * @var int
   */
  protected $propertyA;

  /**
   * @var int
   */
  protected $propertyB;

  public function __construct() {
    $this->propertyA = rand(0, 100000);
    $this->propertyB = rand(0, 100000);
  }

  // ...

  /**
   * {@inheritdoc}
   */
  public function hashCode() {
    // Compute the hash code somehow...
    $prime = 31;
    $hash = 1;
    $hash = $prime * $hash + $this->propertyA;
    $hash = $prime * $hash + $this->propertyB;
    return $hash;
  }
}

$map = new LinkedHashMap();

$obj1 = new ClassWithCustomHashCode();
$obj2 = new ClassWithCustomHashCode();

$map[$obj1] = "A value";
$map[$obj2] = "Another value";

var_dump($map[$obj1]); // "A value"
var_dump($map[$obj2]); // "Another value"