HỏiFix giúp mình code php cơ bản với!

function highlight_code($var) 
{ 
if (!function_exists('process_code')) { 
function process_code($php) 
{ 
$php = strtr($php, array('<br />' => '', '\\' => 'slash_JOHNCMS')); 
$php = html_entity_decode(trim($php), ENT_QUOTES, 'UTF-8'); 
$php = substr($php, 0, 2) != "<?" ? "<?php\n" . $php . "\n?>" : $php; 
$php = highlight_string(stripslashes($php), true); 
$php = strtr($php, array('slash_JOHNCMS' => '&#92;', ':' => '&#58;', '[' => '&#91;')); 
return '<div class="php"><div class="code"><span style="color: black"><b>PHP Code:</b></span></div><div class="coder">' . $php . '</div></div>'; 
} 
} 
return preg_replace(array('#\[php\](.+?)\[\/php\]#se'), array("''.process_code('$1').''"), str_replace("]\n", "]", $var)); 
}

public static function highlight_codes($var) 
    { 
if (!function_exists('process_code')) { 
            function process_code($id) 
            { 
$php = $id[1];
$php = strtr($php, array('<br />' => '', '\\' => 'slash_JOHNCMS')); 
$php = html_entity_decode(trim($php), ENT_QUOTES, 'UTF-8'); 
$php = substr($php, 0, 2) != "<?" ? "<?php\n" . $php . "\n?>" : $php; 
$php = highlight_string(stripslashes($php), true); 
$php = strtr($php, array('slash_JOHNCMS' => '&#92;', ':' => '&#58;', '[' => '&#91;')); 
return '<div class="php"><div class="code"><span style="color: black"><b>PHP Code:</b></span></div><div class="coder">' . $php . '</div></div>';
}
        }
return preg_replace_callback('~\\[php\\](.+?)\\[/php\\]~i', 'process_code', $var); 
}