haystackContainsNeedle.php

<?php
function haystackContainsNeedle($haystack, $needle) {
    $intersection = array_intersect_assoc($haystack, $needle);
    return $intersection == $needle ? 'true' : 'false';
}


$haystack = [
    "firstName" => "Adam",
    "lastName" => "Cameron",
    "role" => "dev"
];


$anyAdamCameron =  [
    "firstName" => "Adam",
    "lastName" => "Cameron"
];
echo haystackContainsNeedle($haystack, $anyAdamCameron) . PHP_EOL; // true


$anyAdam =  [
    "firstName" => "Adam"
];
echo haystackContainsNeedle($haystack, $anyAdam) . PHP_EOL; // true


$someOtherCameron =  [
    "firstName" => "Donald",
    "lastName" => "Cameron"
];
echo haystackContainsNeedle($haystack, $someOtherCameron) . PHP_EOL; // false


$someOtherAdamCameron =  [
    "firstName" => "Adam",
    "lastName" => "Cameron",
    "role" => "Ficticious soap opera character" // false
];
echo haystackContainsNeedle($haystack, $someOtherAdamCameron) . PHP_EOL;


$orderCheck =  [
    "lastName" => "Cameron",
    "firstName" => "Adam"
];
echo haystackContainsNeedle($haystack, $orderCheck) . PHP_EOL; // TRUE