cli-key-input.php

<?php

$mappings = [
  82 => [
    'key' => 'R',
    'message' => 'Redownloading all pages...',
  ],
  114 => [
    'key' => 'r',
    'message' => 'Redownloading all pages...',
  ],
];

echo "Running watcher..." . PHP_EOL;

// start the loop that wall wait for input
readline_callback_handler_install('', function () {
});

while (true) {
  $read = [STDIN];
  $write = null;
  $except = null;
  try {
    $match = stream_select($read, $write, $except, null);
    if ($match) {
      $key = ord(stream_get_contents(STDIN, 1));
      // echo "Char read: $key\n";
      if (isset($mappings[$key])) {
        echo $mappings[$key]['message'] . PHP_EOL;
        // do stuff...
      }
    }
  } catch (Exception $e) {
    echo "Error caught..." . PHP_EOL;
  }
}