PHP .htaccess CRUD classes

htaccessCRUD.class.php

<?php 
/**
 * .htaccess writer CRUD class
 * 
 * @author Lawrence Cherone
 * @version 1.00
 */
class htaccessCRUD
{
	public $file;
	private $handle;

	/**
	 * construct loads [or creates] the .htaccess file
	 *
	 * @param string $file
	 */
	function __construct($file)
	{
		$this->file = $file;
		
		try {
			//create file if not exsist
			if(!file_exists($this->file))
			{
				if (!$this->handle = @fopen($this->file, 'w')) 
				{
					throw new Exception('Cannot create file');
				}
				flock($this->handle,LOCK_EX);
				fwrite($this->handle, 
				    '# .htaccess generated by htaccessCRUD '.
				    'Class by Lawrence Cherone'.PHP_EOL);
				flock($this->handle,LOCK_UN);
				fclose($this->handle);
			}
			
			//check file is readable
			if (!is_readable($this->file)) 
			{
				throw new Exception('File is not readable');
			}
			
			//check file is writable
			if (!is_writable($this->file)) 
			{
				throw new Exception('File is not writable');
			}
			
		} catch (Exception $e) 
		{
			exit('Error: '.$e->getMessage());
		}
	}
	
	/**
	 * Create or update an entry in the .htaccess file
	 *
	 * @param string $data
	 * @param string $delim
	 */
	function create($data = PHP_EOL, $delim = '#')
	{
		//first check for exsisting then update
		if($this->read($delim))
		{
			$this->update($data, $delim);
		} else
		//create new entry
		{
		    $data = PHP_EOL.'# '.$delim.PHP_EOL.$data.PHP_EOL.'# \\'.$delim;
			file_put_contents($this->file, $data, FILE_APPEND);
		}
	}
	
	/**
	 * Read entry from .htaccess file
	 *
	 * @param string $delim
	 * @return mixed (bool|string)
	 */
	function read($delim = '#')
	{
		$file = file_get_contents($this->file);

		$delim = preg_quote($delim);
		if (preg_match("/#\s$delim\s(.*?)\s#\s\\\\$delim/s", $file, $matches))
		{
			return trim($matches[1]);
		} else 
		{
			return false;
		}
	}


	/**
	 * Update entry in .htaccess file
	 *
	 * @param string $data
	 * @param string $delim
	 */
	function update($data = PHP_EOL, $delim = '#')
	{
		$data = str_replace(array('$1','$2','$3','$4','$5'),
				    array('\$1','\$2','\$3','\$4','\$5'), $data);
							
        	$delim = preg_quote($delim);
        
		file_put_contents($this->file, 
				  trim(preg_replace("/#\s$delim\s(.*?)\s#\s\\\\$delim/s", 
						    '# '.$delim.PHP_EOL.$data.PHP_EOL.'# \\'.$delim, 
						    file_get_contents($this->file))));
	}
	
	/**
	 * Delete entry from .htaccess file
	 *
	 * @param string $delim
	 * @return bool
	 */
	function delete($delim = '#')
	{
	    $file = file_get_contents($this->file);

		$delim = preg_quote($delim);
		if (preg_match("/#\s$delim\s(.*?)\s#\s\\\\$delim/s", $file, $matches)) 
		{
		    file_put_contents($this->file, 
		      str_replace(PHP_EOL.$matches[0].PHP_EOL, '', $file));
		    return true;
		} else 
		{
			return false;
		}
	}

}

$htaccess = new htaccessCRUD('./dummy.htaccess');

/**
 * Usage example
 */

//$htaccess->create('Data to go in htaccess', 'the_key');
//$htaccess->read('the_key');
//$htaccess->update('Data to go in htaccess', 'the_key');
//$htaccess->delete('the_key');

if($_SERVER['REQUEST_METHOD'] == 'POST')
{
	foreach($_POST as $key => $value)
	{
		$htaccess->update($value, $key);
	}
}
?>
<h1>.htaccess writer class</h1>
<form method="POST" action="">
  <p>mod_rewrite</p>
  <p><textarea rows="10" name="mod_rewrite" cols="55"><?php echo $htaccess->read('mod_rewrite'); ?></textarea></p>
  
  <p>Blocked IP's</p>
  <p><textarea rows="10" name="custom_blocked" cols="55"><?php echo $htaccess->read('custom_blocked'); ?></textarea></p>
  
  <p>Test</p>
  <p><textarea rows="10" name="test" cols="55"><?php echo $htaccess->read('test'); ?></textarea></p>
  <p><input type="submit" value="Submit"></p>
</form>