count items in array code example

Example 1: php length of array

<?php
	$arr = ["one", "two", "three", "four"];
	echo count($arr);
  ?>

Example 2: get array length using php

// using count() we can get proper length of the array
$names = array("Ankur","Raj","Ram","Suresh");
// pass array into count() as parameter it will return array length
echo count($names);

// output : 4

Example 3: count number of each element in array javascript

var arr = [5, 5, 5, 2, 2, 2, 2, 2, 9, 4];
var counts = {};

for (var i = 0; i < arr.length; i++) {
  var num = arr[i];
  counts[num] ? counts[num] + 1 : 1;
}

console.log(counts[5], counts[2], counts[9], counts[4]);

Example 4: Count elements in an array

//#Source https://bit.ly/2neWfJ2 
const countOccurrences = (arr, val) => arr.reduce((a, v) => (v === val ? a + 1 : a), 0);
console.log(countOccurrences([1, 1, 2, 1, 2, 3], 1));
console.log(countOccurrences([1, 1, 2, 1, 2, 3], 2));
console.log(countOccurrences([1, 1, 2, 1, 2, 3], 3));