07. Key-Multi-Values

<?php
if (isset($_GET['delimiter']) && isset($_GET['key-value-pairs']) && isset($_GET['target-key'])) {
    $delimiter = $_GET['delimiter'];
    $keyValuePairs = $_GET['key-value-pairs'];
    $targetKey = $_GET['target-key'];
    $arrayContainer = array();
    $haveValue = false;
    $keyValuePairs = explode("\n", $keyValuePairs);
    $keyValuePairs = array_map('trim', $keyValuePairs);
    for ($i = 0; $i < count($keyValuePairs); $i++) {
        $pair = explode($delimiter, $keyValuePairs[$i]);
        $key = $pair[0];
        $value = $pair[1];
        if ($targetKey == $key) {
            array_push($arrayContainer, $value);
            $haveValue = true;
        }
    }
    if ($haveValue) {
        echo implode("<br>", $arrayContainer);
    } else {
        echo "None";
    }
}