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![4/2016
$idsToLoad = array_diff($idsRequired, $idsLoaded);
// e.g. cities -> countries
$referencedCountryIds = array_unique([1,1,2,3]);
Array Functions](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-14-2048.jpg)
![4/2016
$array = array_pad([], 10, 0);
foreach ($array as &$item) {
$item = rand();
}
// find max
$max = null;
foreach ($array as $item) {
$max = $max === null ?
$item : max($max, $item);
}](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-20-2048.jpg)
![4/2016
ArrayWrap::create([])
->pad(10, 0)
->map(function () { return rand(); })
->max();](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-21-2048.jpg)
![4/2016
// [x] immutable
// [x] no side effects
$emptyArr = ArrayWrap::create([]);
$padded = $emptyArr->pad(10, 0);
$randList = $padded->map( … );
$max = $randList->max();
var_dump($emptyArr === $padded); // false
var_dump($padded === $randList); // false](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-22-2048.jpg)
![4/2016
$ids = []
foreach ($models as $model) {
$ids[] = $model->id;
}
$ids = array_map(
function ($model) { return $model->id; },
$models
);
Extract a list of ids](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-25-2048.jpg)
![4/2016
$assigned = [];
foreach ($instances as $instance) {
$assigned[$instance->id] = $instance;
}
$assigned = array_combine(array_map(
function ($instance) {return $instance->id;},
$instances
), $instances);
Assign by id](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-27-2048.jpg)
![4/2016
$yelled = [‘OH’, ‘SO’, ‘LOUD’];
$pssst = [];
foreach ($yelled as $v) {
$pssst[] = strtolower($v);
}
$pssst = array_map(‘strtolower’, $yelled);
Apply native functions](https://image.slidesharecdn.com/slidesharephparraysfunctionalprogramming-2-160422095658/75/PHP-Arrays-Functional-Programming-29-2048.jpg)
Uploaded byMichael Rutz
PHP, Arrays & Functional Programming
The document discusses functional programming and array functions in PHP, highlighting the importance of immutability and code readability. It presents various coding examples and performance comparisons between traditional loops and functional approaches like array_map. Additionally, it promotes the use of a custom 'arraywrap' class for enhanced array manipulation and performance.
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