<?php
if (isset($_GET['towns']) && isset($_GET['townsToExclude'])) {
$towns = htmlspecialchars($_GET['towns']);
$towns = explode("\n", $towns);
$towns = array_map('trim', $towns);
$excludeTowns = htmlspecialchars($_GET['townsToExclude']);
$excludeTowns = explode("\n", $excludeTowns);
$excludeTowns = array_map('trim', $excludeTowns);
$result = arrayDiff($towns, $excludeTowns);
printAsList($result);
}
function printAsList(array $arr)
{
echo "<ul>\n";
foreach ($arr as $item) {
echo "<li>{$item}</li>\n";
}
echo "</ul>\n";
}
function arrayDiff(array $array, array $arrToExcl)
{
$result = [];
foreach ($array as $item) {
if (!in_array($item, $arrToExcl)) {
$result[] = $item;
}
}
return $result;
}
?>
<body>
<?php
function excludeFromArray(array $arr, array $excludeArr) : array
{
$result = [];
foreach ($arr as $item) {
if (!in_array($item, $excludeArr)) {
$result[] = $item;
}
}
return $result;
}
function printAsList(array $arr)
{
echo "<ul>\n";
foreach ($arr as $item) {
echo "<li>{$item}</li>\n";
}
echo "</ul>\n";
}
if (isset($_GET['towns']) && isset($_GET['townsToExclude'])) {
$towns = array_map('trim', explode("\n", $_GET['towns']));
$townsToExclude = array_map('trim', explode("\n", $_GET['townsToExclude']));
$remainingTowns = excludeFromArray($towns, $townsToExclude);
printAsList($remainingTowns);
} else {
echo "<form>\n <div style=\"display: inline-block\">\n <div>Towns</div>\n <textarea rows=\"10\" name=\"towns\"></textarea>\n </div>\n <div style=\"display: inline-block\">\n <div>Towns to exclude</div>\n <textarea rows=\"10\" name=\"townsToExclude\"></textarea>\n </div>\n <div><input type=\"submit\" value=\"Exclude\"></div>\n</form>";
}
?>
</body>
</html>
