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Bastian Allgeier
2019-01-13 23:17:34 +01:00
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kirby/src/Toolkit/A.php Executable file
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<?php
namespace Kirby\Toolkit;
use Exception;
/**
* A set of handy methods to simplify array handling
* and make it more consistent.
*
* @package Kirby Toolkit
* @author Bastian Allgeier <bastian@getkirby.com>
* @link http://getkirby.com
* @copyright Bastian Allgeier
* @license MIT
*/
class A
{
/**
* Appends the given array
*
* @param array $array
* @param array $append
* @return array
*/
public static function append(array $array, array $append): array
{
return $array + $append;
}
/**
* Gets an element of an array by key
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* echo A::get($array, 'cat');
* // output: 'miao'
*
* echo A::get($array, 'elephant', 'shut up');
* // output: 'shut up'
*
* $catAndDog = A::get($array, ['cat', 'dog']);
* // result: ['cat' => 'miao', 'dog' => 'wuff'];
* </code>
*
* @param array $array The source array
* @param mixed $key The key to look for
* @param mixed $default Optional default value, which should be
* returned if no element has been found
* @return mixed
*/
public static function get(array $array, $key, $default = null)
{
// return the entire array if the key is null
if ($key === null) {
return $array;
}
// get an array of keys
if (is_array($key) === true) {
$result = [];
foreach ($key as $k) {
$result[$k] = static::get($array, $k, $default);
}
return $result;
}
if (isset($array[$key]) === true) {
return $array[$key];
}
// support dot notation
if (strpos($key, '.') !== false) {
$keys = explode('.', $key);
foreach ($keys as $innerKey) {
if (isset($array[$innerKey]) === false) {
return $default;
}
$array = $array[$innerKey];
}
return $array;
}
return $default;
}
/**
* @return string
*/
public static function join($value, $separator = ', ')
{
if (is_string($value) === true) {
return $value;
}
return implode($separator, $value);
}
const MERGE_OVERWRITE = 0;
const MERGE_APPEND = 1;
const MERGE_REPLACE = 2;
/**
* Merges arrays recursively
*
* @param array $array1
* @param array $array2
* @param boolean $mode Behavior for elements with numeric keys;
* A::MERGE_APPEND: elements are appended, keys are reset;
* A::MERGE_OVERWRITE: elements are overwritten, keys are preserved
* A::MERGE_REPLACE: non-associative arrays are completely replaced
* @return array
*/
public static function merge($array1, $array2, $mode = A::MERGE_APPEND)
{
$merged = $array1;
if (static::isAssociative($array1) === false && $mode === static::MERGE_REPLACE) {
return $array2;
}
foreach ($array2 as $key => $value) {
// append to the merged array, don't overwrite numeric keys
if (is_int($key) === true && $mode == static::MERGE_APPEND) {
$merged[] = $value;
// recursively merge the two array values
} elseif (is_array($value) === true && isset($merged[$key]) === true && is_array($merged[$key]) === true) {
$merged[$key] = static::merge($merged[$key], $value, $mode);
// simply overwrite with the value from the second array
} else {
$merged[$key] = $value;
}
}
if ($mode == static::MERGE_APPEND) {
// the keys don't make sense anymore, reset them
// array_merge() is the simplest way to renumber
// arrays that have both numeric and string keys;
// besides the keys, nothing changes here
$merged = array_merge($merged, []);
}
return $merged;
}
/**
* Plucks a single column from an array
*
* <code>
* $array[] = [
* 'id' => 1,
* 'username' => 'homer',
* ];
*
* $array[] = [
* 'id' => 2,
* 'username' => 'marge',
* ];
*
* $array[] = [
* 'id' => 3,
* 'username' => 'lisa',
* ];
*
* var_dump(A::pluck($array, 'username'));
* // result: ['homer', 'marge', 'lisa'];
* </code>
*
* @param array $array The source array
* @param string $key The key name of the column to extract
* @return array The result array with all values
* from that column.
*/
public static function pluck(array $array, string $key)
{
$output = [];
foreach ($array as $a) {
if (isset($a[$key]) === true) {
$output[] = $a[$key];
}
}
return $output;
}
/**
* Prepends the given array
*
* @param array $array
* @param array $prepend
* @return array
*/
public static function prepend(array $array, array $prepend): array
{
return $prepend + $array;
}
/**
* Shuffles an array and keeps the keys
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* $shuffled = A::shuffle($array);
* // output: [
* // 'dog' => 'wuff',
* // 'cat' => 'miao',
* // 'bird' => 'tweet'
* // ];
* </code>
*
* @param array $array The source array
* @return array The shuffled result array
*/
public static function shuffle(array $array): array
{
$keys = array_keys($array);
$new = [];
shuffle($keys);
// resort the array
foreach ($keys as $key) {
$new[$key] = $array[$key];
}
return $new;
}
/**
* Returns the first element of an array
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* $first = A::first($array);
* // first: 'miao'
* </code>
*
* @param array $array The source array
* @return mixed The first element
*/
public static function first(array $array)
{
return array_shift($array);
}
/**
* Returns the last element of an array
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* $last = A::last($array);
* // last: 'tweet'
* </code>
*
* @param array $array The source array
* @return mixed The last element
*/
public static function last(array $array)
{
return array_pop($array);
}
/**
* Fills an array up with additional elements to certain amount.
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* $result = A::fill($array, 5, 'elephant');
*
* // result: [
* // 'cat',
* // 'dog',
* // 'bird',
* // 'elephant',
* // 'elephant',
* // ];
* </code>
*
* @param array $array The source array
* @param int $limit The number of elements the array should
* contain after filling it up.
* @param mixed $fill The element, which should be used to
* fill the array
* @return array The filled-up result array
*/
public static function fill(array $array, int $limit, $fill = 'placeholder'): array
{
if (count($array) < $limit) {
$diff = $limit - count($array);
for ($x = 0; $x < $diff; $x++) {
$array[] = $fill;
}
}
return $array;
}
/**
* Move an array item to a new index
*
* @param array $array
* @param int $from
* @param int $to
* @return array
*/
public static function move(array $array, int $from, int $to): array
{
$total = count($array);
if ($from >= $total || $from < 0) {
throw new Exception('Invalid "from" index');
}
if ($to >= $total || $to < 0) {
throw new Exception('Invalid "to" index');
}
// remove the item from the array
$item = array_splice($array, $from, 1);
// inject it at the new position
array_splice($array, $to, 0, $item);
return $array;
}
/**
* Checks for missing elements in an array
*
* This is very handy to check for missing
* user values in a request for example.
*
* <code>
* $array = [
* 'cat' => 'miao',
* 'dog' => 'wuff',
* 'bird' => 'tweet'
* ];
*
* $required = ['cat', 'elephant'];
*
* $missng = A::missing($array, $required);
* // missing: [
* // 'elephant'
* // ];
* </code>
*
* @param array $array The source array
* @param array $required An array of required keys
* @return array An array of missing fields. If this
* is empty, nothing is missing.
*/
public static function missing(array $array, array $required = []): array
{
$missing = [];
foreach ($required as $r) {
if (isset($array[$r]) === false) {
$missing[] = $r;
}
}
return $missing;
}
/**
* Sorts a multi-dimensional array by a certain column
*
* <code>
* $array[0] = [
* 'id' => 1,
* 'username' => 'mike',
* ];
*
* $array[1] = [
* 'id' => 2,
* 'username' => 'peter',
* ];
*
* $array[3] = [
* 'id' => 3,
* 'username' => 'john',
* ];
*
* $sorted = A::sort($array, 'username ASC');
* // Array
* // (
* // [0] => Array
* // (
* // [id] => 3
* // [username] => john
* // )
* // [1] => Array
* // (
* // [id] => 1
* // [username] => mike
* // )
* // [2] => Array
* // (
* // [id] => 2
* // [username] => peter
* // )
* // )
*
* </code>
*
* @param array $array The source array
* @param string $field The name of the column
* @param string $direction desc (descending) or asc (ascending)
* @param int $method A PHP sort method flag or 'natural' for
* natural sorting, which is not supported in
* PHP by sort flags
* @return array The sorted array
*/
public static function sort(array $array, string $field, string $direction = 'desc', $method = SORT_REGULAR): array
{
$direction = strtolower($direction) == 'desc' ? SORT_DESC : SORT_ASC;
$helper = [];
$result = [];
// build the helper array
foreach ($array as $key => $row) {
$helper[$key] = $row[$field];
}
// natural sorting
if ($direction === SORT_DESC) {
arsort($helper, $method);
} else {
asort($helper, $method);
}
// rebuild the original array
foreach ($helper as $key => $val) {
$result[$key] = $array[$key];
}
return $result;
}
/**
* Checks wether an array is associative or not
*
* <code>
* $array = ['a', 'b', 'c'];
*
* A::isAssociative($array);
* // returns: false
*
* $array = ['a' => 'a', 'b' => 'b', 'c' => 'c'];
*
* A::isAssociative($array);
* // returns: true
* </code>
*
* @param array $array The array to analyze
* @return boolean true: The array is associative false: It's not
*/
public static function isAssociative(array $array): bool
{
return ctype_digit(implode(null, array_keys($array))) === false;
}
/**
* Returns the average value of an array
*
* @param array $array The source array
* @param int $decimals The number of decimals to return
* @return float The average value
*/
public static function average(array $array, int $decimals = 0): float
{
return round((array_sum($array) / sizeof($array)), $decimals);
}
/**
* Merges arrays recursively
*
* <code>
* $defaults = [
* 'username' => 'admin',
* 'password' => 'admin',
* ];
*
* $options = A::extend($defaults, ['password' => 'super-secret']);
* // returns: [
* // 'username' => 'admin',
* // 'password' => 'super-secret'
* // ];
* </code>
*
* @return array
*/
public static function extend(...$arrays): array
{
return array_merge_recursive(...$arrays);
}
/**
* Update an array with a second array
* The second array can contain callbacks as values,
* which will get the original values as argument
*
* <code>
* $user = [
* 'username' => 'homer',
* 'email' => 'homer@simpsons.com'
* ];
*
* // simple updates
* A::update($user, [
* 'username' => 'homer j. simpson'
* ]);
*
* // with callback
* A::update($user, [
* 'username' => function ($username) {
* return $username . ' j. simpson'
* }
* ]);
* </code>
*
* @param array $array
* @param array $update
* @return array
*/
public static function update(array $array, array $update): array
{
foreach ($update as $key => $value) {
if (is_a($value, 'Closure') === true) {
$array[$key] = call_user_func($value, static::get($array, $key));
} else {
$array[$key] = $value;
}
}
return $array;
}
/**
* Wraps the given value in an array
* if it's not an array yet.
*
* @param mixed|null $array
* @return array
*/
public static function wrap($array = null): array
{
if ($array === null) {
return [];
} elseif (is_array($array) === false) {
return [$array];
} else {
return $array;
}
}
}