improvement to https://www.firehed.net/lint-check-all-php-files-syntax-validation so that it doesn't re-lint all your files

php lint all files

#!/opt/local/bin/php
<?php

// https://www.firehed.net/lint-check-all-php-files-syntax-validation
// with some modifications

// ===========
// = Globals =
// ===========
$count   = 0; // total files checked
$changed = array();
$errors  = array();
$options = setOptions(array(
	'quiet'   => false,
	'recurse' => false,
));
$start = microtime(true);

// include the md5 of this file so
// a new cache is used when we change the file
$cache_path = __DIR__.'/php-lint-cache.'.md5_file(__FILE__).'.cache';

// this cache file saves md5-checksums of files
// so we don't have to re-lint already verified files
if (file_exists($cache_path))
    require $cache_path;
else
    $md5_cache_old = array();

if ($options['quiet']) {
	ob_start();
}

// =============
// = Scan path =
// =============
$files = getPipedFiles();

$path = $_SERVER['PWD']; // Default to execution directory

echo "Running PHP Lint:\n";

// Piped files present
if ($files) { 
	foreach ($files as $file) {
		checkFile("$path/$file");
	}
}
// Use arguments
else {
	if ($_SERVER['argc'] > 1) {
		$last = end($_SERVER['argv']);
		if (substr($last, 0, 1) != '-') {
			$path = $last; // snag last argument, if it wasn't an option switch
		}
	}
	
	if (is_dir($path)) {
		checkDirectoryContents($path);
	}
	elseif (is_file($path)) {
		checkFile($path);
	}
	else {
		echo "$path is not a file or directory.\n";
		showHelp() AND exit(1);
	}
}

if ($options['quiet']) {
	ob_end_clean();
}

$time = microtime(true) - $start;
echo "\n$count total files checked, ".count($changed)." changed files, ".count($errors).' errors; took '.number_format($time, 3).' seconds';

if ($changed)
    echo "\nChanged php files:\n\t", implode($changed, "\n\t");

if ($errors)
    echo "\n*********************\nFiles with ERRORS:\n\t", implode($errors, "\n\t")."\n*********************";
else
    echo "\nNO ERRORS";

echo "\n";

file_put_contents($cache_path, "<?php \$md5_cache_old = ".var_export($md5_cache_new, true)." ?>");

if (empty($errors))
	exit(0); // exit successfully
else
	exit(1); // exit unsuccessfully

function checkDirectoryContents($dir) {
	global $options, $i, $errors, $count;
	
	$contents = scandir($dir);

	foreach($contents as $content) {

		if (	$content == '.' || 
			$content == '..') {

			continue;
		}

		$path = "$dir/$content";
		
		// Recurse into directories
		if (is_dir($path) && $options['recurse']) {

			checkDirectoryContents($path);

		} // if is_dir
		else {
			// Skip non-php files
			if (substr($path, -4) != '.php') {
				continue;
			}
			checkFile($path);
		} // !is_dir
	} // foreach
} // function checkDirectoryContents

function checkFile($path) {
	global $count, $errors, $md5_cache_old, $md5_cache_new, $changed;

	if (($count % 80 == 0)) {
		echo "\n";
	}

	$md5 = md5_file($path);
	
    // check md5_cache to see if we've already linted this file
	if (isset($md5_cache_old[$md5])) :
	    $error = $md5_cache_old[$md5];
	    
	else :
		
		exec('php -l ' . escapeshellarg( $path ) . ' 2> /dev/null', $output, $return);

        if ($return === 0) : // php -l gives a 0 error code if everything went well
	        $error = false;
	    else :
	        
	        array_shift($output); // first line is always blank
            array_pop($output); // the last line is always "Errors parsing httpdocs/test.php"

            $error = implode("\n", $output);
	    
	    endif;
	    
	    $changed[] = $path;

	endif;
	
	$md5_cache_new[$md5] = $error;
		
	if ($error) {
		$errors[] = $error;
		echo 'E';
	} else {
	    echo ".";
	}
	
	$count++;
}


function getPipedFiles() {
	$files = array();
	stream_set_blocking(STDIN,FALSE);
	while ($line = trim(fgets(STDIN))) {
		$files[] = $line;
	}
	return $files;
}

function setOptions($options) {
	$args = array_keys(getopt('qRh', array('quiet', 'recursive', 'help')));
	foreach ($args as $arg) {
		switch ($arg) {
			case 'q':
			case 'quiet':
				$options['quiet'] = true;
				break;

			case 'R':
			case 'recursive':
				$options['recurse'] = true;
				break;

			case 'h':
			case 'help':
			default:
				showHelp() AND exit(0);
		} // Switch
	} // Foreach args
	return $options;
} // function setOptions

function showHelp() {
	echo <<<HELP
usage: lint [-qR] [path]

options: 
	-q, --quiet:     disable verbose output
	-R, --recursive: recurse into subdirectories
	-h, --help:      display this help screen

HELP;
	return true;
}