feat: array functions

Author: codewithhridoy

14_array_functions.php

@@ -0,0 +1,82 @@
+<?php
+/* --------- Array Functions -------- */
+
+/*
+  Functions to work with arrays
+  https://www.php.net/manual/en/ref.array.php
+*/
+
+$fruits = ['apple', 'banana', 'orange'];
+
+// Get array length
+echo count($fruits);
+echo '<pre />';
+
+// Search array
+echo in_array('banana', $fruits);
+
+echo '<pre />';
+
+// Add to an array
+$fruits[] = 'grape';
+array_push($fruits, 'mango', 'raspberry');
+array_unshift($fruits, 'kiwi'); // Adds to the beginning
+
+// Remove from array
+array_pop($fruits); // Removes last
+array_shift($fruits); // Removes first
+// Remove specific element
+unset($fruits[2]);
+
+// Split into chunks of 2
+print_r($fruits);
+
+$chunkedArray = array_chunk($fruits, 2);
+print_r($chunkedArray);
+
+// Concatenate arrays
+$arr1 = [1, 2, 3];
+$arr2 = [4, 5, 6];
+$arr3 = array_merge($arr1, $arr2);
+var_dump($arr3);
+$arr4 = [...$arr1, ...$arr2]; // Use Spread
+var_dump($arr4);
+
+// Combine arrays (Keys & values)
+$a = ['green', 'red', 'yellow'];
+$b = ['avocado', 'apple', 'banana'];
+$c = array_combine($a, $b);
+
+print_r($c);
+
+// Array of keys
+$keys = array_keys($c);
+
+print_r($keys);
+
+// Flip keys with values
+$flipped = array_flip($c);
+print_r($flipped);
+
+// Create array of numbers with range()
+$numbers = range(1, 5);
+
+// Map through array and create a new one
+$newNumbers = array_map(function ($number) {
+  return "Number $number";
+}, $numbers);
+
+// Using arrow function
+$newNumbers = array_map(fn($number) => "Number $number", $numbers);
+
+print_r($newNumbers);
+
+// Filter array
+$lessThan10 = array_filter($numbers, fn($number) => $number < 3);
+
+print_r($lessThan10);
+
+// Array Reduce
+// "carry" holds the return value of the previous iteration
+$sum = array_reduce($numbers, fn($carry, $number) => $carry + $number);
+var_dump($sum);