Common functional methods in PHP

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Mapping

Applying a function to all elements of an array :

array_map('strtoupper', $array);

Be aware that this is the only method of the list where the callback comes first.

Reducing (or folding)

Reducing an array to a single value :

$sum = array_reduce($numbers, function ($carry, $number) {
   return $carry + $number;
});

Filtering

Returns only the array items for which the callback returns true :

$onlyEven = array_filter($numbers, function ($number) {
    return ($number % 2) === 0;
});

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Functional programming:
* Common functional methods in PHP
* Scope

Table Of Contents
2 Arrays
3 Functional programming
4 Types
10 Cookies
14 JSON
15 SOAP
17 cURL
19 XML
21 Traits
35 UTF-8
36 URLs
38 PHPDoc
41 Loops
44 Closur
72 YAML
77 Cache
78 Streams
81 PDO
82 SQLite3
83 Sockets
87 MongoDB
93 IMAP
94 Redis
95 Imagick
102 APCu
108 PSR