A curated collection of useful PHP snippets that you can understand in 30 seconds or less.
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Returns true if the provided function returns true for all elements of an array, false otherwise.
function all($items, $func)
{
return count(array_filter($items, $func)) === count($items);
}Examples
all([2, 3, 4, 5], function ($item) {
return $item > 1;
}); // trueReturns true if the provided function returns true for at least one element of an array, false otherwise.
function any($items, $func)
{
return count(array_filter($items, $func)) > 0;
}Examples
any([1, 2, 3, 4], function ($item) {
return $item < 2;
}); // trueChunks an array into smaller arrays of a specified size.
function chunk($items, $size)
{
return array_chunk($items, $size);
}Examples
chunk([1, 2, 3, 4, 5], 2); // [[1, 2], [3, 4], [5]]Deep flattens an array.
function deepFlatten($items)
{
$result = [];
foreach ($items as $item) {
if (!is_array($item)) {
$result[] = $item;
} else {
$result = array_merge($result, deepFlatten($item));
}
}
return $result;
}Examples
deepFlatten([1, [2], [[3], 4], 5]); // [1, 2, 3, 4, 5]Returns a new array with n elements removed from the left.
function drop($items, $n = 1)
{
return array_slice($items, $n);
}Examples
drop([1, 2, 3]); // [2,3]
drop([1, 2, 3], 2); // [3]Returns the last element for which the provided function returns a truthy value.
function findLast($items, $func)
{
$filteredItems = array_filter($items, $func);
return array_pop($filteredItems);
}Examples
findLast([1, 2, 3, 4], function ($n) {
return ($n % 2) === 1;
});
// 3Returns the index of the last element for which the provided function returns a truthy value.
function findLastIndex($items, $func)
{
$keys = array_keys(array_filter($items, $func));
return array_pop($keys);
}Examples
findLastIndex([1, 2, 3, 4], function ($n) {
return ($n % 2) === 1;
});
// 2Flattens an array up to the one level depth.
function flatten($items)
{
$result = [];
foreach ($items as $item) {
if (!is_array($item)) {
$result[] = $item;
} else {
$result = array_merge($result, array_values($item));
}
}
return $result;
}Examples
flatten([1, [2], 3, 4]); // [1, 2, 3, 4]Groups the elements of an array based on the given function.
function groupBy($items, $func)
{
$group = [];
foreach ($items as $item) {
if ((!is_string($func) && is_callable($func)) || function_exists($func)) {
$key = call_user_func($func, $item);
$group[$key][] = $item;
} elseif (is_object($item)) {
$group[$item->{$func}][] = $item;
} elseif (isset($item[$func])) {
$group[$item[$func]][] = $item;
}
}
return $group;
}Examples
groupBy(['one', 'two', 'three'], 'strlen') // [3 => ['one', 'two'], 5 => ['three']]Checks a flat list for duplicate values. Returns true if duplicate values exists and false if values are all unique.
function hasDuplicates($items)
{
return count($items) > count(array_unique($items));
}Examples
hasDuplicates([1, 2, 3, 4, 5, 5]); // trueReturns the head of a list.
function head($items)
{
return reset($items);
}Examples
head([1, 2, 3]); // 1Returns the last element in an array.
function last($items)
{
return end($items);
}Examples
last([1, 2, 3]); // 3Retrieves all of the values for a given key:
function pluck($items, $key)
{
return array_map( function($item) use ($key) {
return is_object($item) ? $item->$key : $item[$key];
}, $items);
}Examples
pluck([
['product_id' => 'prod-100', 'name' => 'Desk'],
['product_id' => 'prod-200', 'name' => 'Chair'],
], 'name');
// ['Desk', 'Chair']Mutates the original array to filter out the values specified.
function pull(&$items, ...$params)
{
$items = array_values(array_diff($items, $params));
return $items;
}Examples
$items = ['a', 'b', 'c', 'a', 'b', 'c'];
pull($items, 'a', 'c'); // $items will be ['b', 'b']Filters the collection using the given callback.
function reject($items, $func)
{
return array_values(array_diff($items, array_filter($items, $func)));
}Examples
reject(['Apple', 'Pear', 'Kiwi', 'Banana'], function ($item) {
return strlen($item) > 4;
}); // ['Pear', 'Kiwi']Removes elements from an array for which the given function returns false.
function remove($items, $func)
{
$filtered = array_filter($items, $func);
return array_diff_key($items, $filtered);
}Examples
remove([1, 2, 3, 4], function ($n) {
return ($n % 2) === 0;
});
// [0 => 1, 2 => 3]Returns all elements in an array except for the first one.
function tail($items)
{
return count($items) > 1 ? array_slice($items, 1) : $items;
}Examples
tail([1, 2, 3]); // [2, 3]Returns an array with n elements removed from the beginning.
function take($items, $n = 1)
{
return array_slice($items, 0, $n);
}Examples
take([1, 2, 3], 5); // [1, 2, 3]
take([1, 2, 3, 4, 5], 2); // [1, 2]Filters out the elements of an array, that have one of the specified values.
function without($items, ...$params)
{
return array_values(array_diff($items, $params));
}Examples
without([2, 1, 2, 3], 1, 2); // [3]Returns the average of two or more numbers.
function average(...$items)
{
return count($items) === 0 ? 0 : array_sum($items) / count($items);
}Examples
average(1, 2, 3); // 2Calculates the factorial of a number.
function factorial($n)
{
if ($n <= 1) {
return 1;
}
return $n * factorial($n - 1);
}Examples
factorial(6); // 720Generates an array, containing the Fibonacci sequence, up until the nth term.
function fibonacci($n)
{
$sequence = [0, 1];
for ($i = 0; $i < $n - 2; $i++) {
array_push($sequence, array_sum(array_slice($sequence, -2, 2, true)));
}
return $sequence;
}Examples
fibonacci(6); // [0, 1, 1, 2, 3, 5]Calculates the greatest common divisor between two or more numbers.
function gcd(...$numbers)
{
if (count($numbers) > 2) {
return array_reduce($numbers, 'gcd');
}
$r = $numbers[0] % $numbers[1];
return $r === 0 ? abs($numbers[1]) : gcd($numbers[1], $r);
}Examples
gcd(8, 36); // 4
gcd(12, 8, 32); // 4Returns true if the given number is even, false otherwise.
function isEven($number)
{
return ($number % 2) === 0;
}Examples
isEven(4); // trueChecks if the provided integer is a prime number.
function isPrime($number)
{
$boundary = floor(sqrt($number));
for ($i = 2; $i <= $boundary; $i++) {
if ($number % $i === 0) {
return false;
}
}
return $number >= 2;
}Examples
isPrime(3); // trueReturns the least common multiple of two or more numbers.
function lcm(...$numbers)
{
$ans = $numbers[0];
for ($i = 1; $i < count($numbers); $i++) {
$ans = ((($numbers[$i] * $ans)) / (gcd($numbers[$i], $ans)));
}
return $ans;
}Examples
lcm(12, 7); // 84
lcm(1, 3, 4, 5); // 60Returns the median of an array of numbers.
function median($numbers)
{
sort($numbers);
$totalNumbers = count($numbers);
$mid = floor($totalNumbers / 2);
return ($totalNumbers % 2) === 0 ? ($numbers[$mid - 1] + $numbers[$mid]) / 2 : $numbers[$mid];
}Examples
median([1, 3, 3, 6, 7, 8, 9]); // 6
median([1, 2, 3, 6, 7, 9]); // 4.5Check if a string is ends with a given substring.
function endsWith($haystack, $needle)
{
return substr($haystack, -strlen($needle)) === $needle;
}Examples
endsWith('Hi, this is me', 'me'); // trueReturns the first string there is between the strings from the parameter start and end.
function firstStringBetween($haystack, $start, $end)
{
$char = strpos($haystack, $start);
if (!$char) {
return '';
}
$char += strlen($start);
$len = strpos($haystack, $end, $char) - $char;
return substr($haystack, $char, $len);
}Examples
firstStringBetween('This is a [custom] string', '[', ']'); // customCompare two strings and returns true if both strings are anagram, false otherwise.
function isAnagram($string1, $string2)
{
return count_chars($string1, 1) === count_chars($string2, 1);
}Examples
isAnagram('act', 'cat'); // trueReturns true if the given string is lower case, false otherwise.
function isLowerCase($string)
{
return $string === strtolower($string);
}Examples
isLowerCase('Morning shows the day!'); // false
isLowerCase('hello'); // trueReturns true if the given string is upper case, false otherwise.
function isUpperCase($string)
{
return $string === strtoupper($string);
}Examples
isUpperCase('MORNING SHOWS THE DAY!'); // true
isUpperCase('qUick Fox'); // falseReturns true if the given string is a palindrome, false otherwise.
function palindrome($string)
{
return strrev($string) === $string;
}Examples
palindrome('racecar'); // trueCheck if a string is starts with a given substring.
function startsWith($haystack, $needle)
{
return substr($haystack, 0, strlen($needle)) === $needle;
}Examples
startsWith('Hi, this is me', 'Hi'); // trueReturn a new function that composes multiple functions into a single callable.
function compose(...$functions)
{
return array_reduce(
$functions,
function ($carry, $function) {
return function ($x) use ($carry, $function) {
return $function($carry($x));
};
},
function ($x) {
return $x;
}
);
}Examples
$compose = compose(
// add 2
function ($x) {
return $x + 2;
},
// multiply 4
function ($x) {
return $x * 4;
}
);
$compose(3); // 20You're always welcome to contribute to this project. Please read the contribution guide.
This project is licensed under the MIT License - see the License File for details
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