private $defined_functions;

function __construct() {

$this->defined_functions = get_defined_functions();

}

function format( $file, $lang = 'php' ) {

// Read from file or string

if( is_file($file) ) {

$source = strip_tags(file_get_contents($file));

}

else {

$source = strip_tags($file);

}

// Convert line-breaks

$source = preg_replace('/\r\n|\r/', "\r\n", $source);

// Read line by line

$lines = explode("\n", $source);

$n_lines = count($lines);

for( $i = 0; $i < $n_lines; ++$i ) {

$first_char = substr(trim($lines[$i]), 0, 1);

if( $first_char == '/' || $first_char == '*' || $first_char == '#' ) {

$lines[$i] = '<span class="comment">' . $lines[$i] . '</span>';

}

else {

// Strings(quoted)

$lines[$i] = preg_replace('/(".*?"|\'.*?\')/', '<span class="string">$1</span>', $lines[$i]);

// Variables

$lines[$i] = preg_replace('/(\$[a-zA-z0-9]*|->[a-zA-z0-9]*)\b/', '<span class="variable">$1</span>', $lines[$i]);

// Constant

$lines[$i] = preg_replace('/(__[a-zA-Z0-9]*_+|\$_+[A-Z]*)/', '<span class="constant">$1</span>', $lines[$i]);

// Storage

$lines[$i] = preg_replace('/(class|function|new|public|private|protected|var|interface) /', '<span class="storage">$1</span> ', $lines[$i]);

// Storage Modifier

$lines[$i] = preg_replace('/(abstract|extends|implements) /', '<span class="modifier">$1</span> ', $lines[$i]);

}

}

$output = '';

foreach( $lines as $line ) {

if( !empty($line) ) {

$output .= $line . "\r\n";

}

}

return "<pre class=\"$lang\">\n" . $output . "</pre>\n";

}