phorge-phorge/src/aphront/sink/AphrontPHPHTTPSink.php

<?php

/**
 * Concrete HTTP sink which uses "echo" and "header()" to emit data.
 */
final class AphrontPHPHTTPSink extends AphrontHTTPSink {

  protected function emitHTTPStatus($code, $message = '') {
    if ($code != 200) {
      $header = "HTTP/1.0 {$code}";
      if (strlen($message)) {
        $header .= " {$message}";
      }
      header($header);
    }
  }

  protected function emitHeader($name, $value) {
    header("{$name}: {$value}", $replace = false);
  }

  protected function emitData($data) {
    echo $data;

    // Try to push the data to the browser. This has a lot of caveats around
    // browser buffering and display behavior, but approximately works most
    // of the time.
    flush();
  }

  protected function isWritable() {
    return !connection_aborted();
  }

}