PHP code example of haskellcamargo / php-maybe-monad

1. Go to this page and download the library: Download haskellcamargo/php-maybe-monad library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

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

haskellcamargo / php-maybe-monad example snippets


use HaskellCamargo\Maybe;

Maybe\Maybe(@$_GET["username"])->bind(function($user)) {
  echo "Welcome, $user. You're logged in!";
});

$userAge = Maybe\Maybe(null)->fromMaybe(0); // => 0
$userAge = Maybe\Maybe(19)->fromMaybe(0); // => 19


$age = Maybe\Maybe(null)->bind(function($x) {
  return 10;
}); // => Nothing

$age = Maybe\Maybe(10)
->bind(function($x) {
  return $x + 10; // => Just(20);
})
->bind(function($x) {
  return $x + 20; // => Just(40);
})->fromJust(); // => 40


Maybe\Maybe("Foo")->fromJust(); // => "Foo"
Maybe\Maybe(null)->fromJust(); // => Exception: Cannot cal fromJust() on Nothing


Maybe\Maybe(10)->fromMaybe(5); // => 10
Maybe\Maybe(null)->fromMaybe(5); // => 5


Maybe\Maybe(10)->isJust(); // => true
Maybe\Maybe(null)->isJust(); // => false


Maybe\Maybe(10)->isNothing(); // => false
Maybe\Maybe(null)->isNothing(); // => true


$just = Maybe\Maybe(10);
$nothing = Maybe\Maybe(null);

$just->maybe(40, function($num) {
        return $num + 15;
}); // => 25

$nothing->maybe(40, function($num) {
  return $num + 15;
}); // => 40


Maybe\Maybe(10)->toList(); // => [10]
Maybe\Maybe(null)->toList(); // => []

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