1.Why the output of the following programme is 2 ?

Question

<?php
$arr['name1']="solo";
$arr['name1']+="learn";
$arr['name1']="ab";
$arr['name2']="1";
echo count($arr);
echo "<br/>";

Answer 1

it is because the "arr" array has two elements that are 'name1' and 'name2'.
count($arr) returns the number of elements inside the array
https://code.sololearn.com/wRGX48r2fUFi/?ref=app