buildphar.php

<?php

/**
 * php.ini
 * phar.readonly=0
 *
 *
 * /path/to/dir
 *     buildphar.php
 *     /src
 *         main.php -- <?php print "hello";
 *
 */
$pharFile = 'main.phar';

if (file_exists($pharFile)) {
  unlink($pharFile);
}

$phar = new Phar(
  $pharFile,
  FilesystemIterator::CURRENT_AS_FILEINFO,
  'main.phar'
);
$phar->buildFromDirectory(
  __DIR__ . DIRECTORY_SEPARATOR . 'src',
  '/\.php$/'
);
$phar->setStub($phar->createDefaultStub('main.php'));