Recursively and safely swap out PHP short open and short echo tags in a directory

replace-short-open.php

<?php 

/*
 * Run like so: `php -d short_open_tag=On replace-short-open.php
 *
 * Shamelessly cobbled together from:
 * https://stackoverflow.com/a/17161106/2233690
 * https://stackoverflow.com/questions/684587/batch-script-to-replace-php-short-open-tags-with-php/1647429#1647429
 * https://stackoverflow.com/a/684752/2233690
 *
*/

/*
 *
 * Recursive glob
 *
*/
function rglob($pattern, $flags = 0) {
	$files = glob($pattern, $flags); 
	foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR|GLOB_NOSORT) as $dir) {
		$files = array_merge($files, rglob($dir.'/'.basename($pattern), $flags));
	}
	return $files;
}

foreach (rglob("*.php") as $file) {

	$content = file_get_contents($file);
	$tokens = token_get_all($content);
	$output = '';

	foreach($tokens as $token) {
		if(is_array($token)) {
			list($index, $code, $line) = $token;
			switch($index) {
				case T_OPEN_TAG_WITH_ECHO:
				$output .= '<?php echo ';
				break;
				case T_OPEN_TAG:
				$output .= '<?php ';
				break;
				default:
				$output .= $code;
				break;
			}

		}
		else {
			$output .= $token;
		}
	}
	file_put_contents($file, $output);
}