<?php
declare(strict_types=1);
/**
* Write a function that accepts an array of strings and return another array
* with strings in the input array set as keys.
*
* @param string[] $arrOfStrings An array of strings.
* @return array Another array with strings in the input array set as keys.
*/
function foo(array $arrOfStrings): array
{
return array_fill_keys(array_filter($arrOfStrings, 'is_string'), null);
}
/**
* Now write another function that accepts the output of the previous function,
* as first argument and another string as second argument. In this function,
* assume that you have some reason to iterate over the the input array using
* foreach, key => value format. In every iteration, in addition to other stuff,
* you also have to check if the key is equal to the input string (the second
* parameter of this function), and if they match do some stuff....
*
* @param array $outputFromFoo The output from {@link foo()}.
*/
function bar(array $outputFromFoo, string $str)
{
foreach ($outputFromFoo as $key => $value) {
// other stuff
if ($key === $str) {
echo "Found $str!";
}
}
}
$result = foo(array('ab', 'cd', '10'));
bar($result, '10');
?>