ConfigParser.py semiclone in PHP

ConfigParser.php

<?php

class ConfigParser {

	private $_raw;
	private $_ini;
	private $_allow_no_value=false;
	
	
	function __construct($allow_no_value=false) {
		$this->_allow_no_value = $allow_no_value;
	}

	
	function read($inifile) {
		$this->_raw = file_get_contents($inifile);
		$this->_ini = $this->parse();
		return $this->_ini;
	}
	

	function write($inifile) {
		$content = $this->build();
		return file_put_contents($inifile, $content);
	}
	
	
	private function parse() {
	
		$lines = preg_split("#[\r?\n]+#", $this->_raw);
		$section = "DEFAULT";
		$ini = array();
	
		foreach ($lines as $line) {
			$line = trim($line);
			
			if (preg_match("#^[;\#]#", $line)) continue;
			
			if (preg_match("#^\[(.*)\]$#", $line, $m)) {
				$section = $m[1];
				$ini[$section] = array();
				continue;	
			}
			
			if (preg_match("#^(?P<key>[^=\s\t]+)[\t\s]*=[\t\s]*(?P<value>[^;\#\s\t]+)#", $line, $m)) {
				$ini[$section][$m['key']] = $m['value'];
				continue;
			}
			
			if ($this->_allow_no_value and preg_match("#^(?P<key>[^;\#\s\t]+)#", $line, $m)) {
				$ini[$section][$m['key']] = null;
				continue;
			}
		}
		
		return $ini;
	}
	

	private function build($inifile) {
		$content = "";
		
		foreach ($this->_ini as $section_or_key => $set) {
			if (!is_array($set))
				$content .= $this->_build_var($section_or_key, $set);
			
			else {
				$content .= $this->_build_section($section_or_key);
				
				foreach ($set as $k => $v)
					$content .= $this->_build_var($k, $v);
			}
		}

		return $content;
	}
	
	private function _build_var($k, $v) {
		if ($this->_allow_no_value and $v === null) return $k."\n";
		else return $k ." = ". $v."\n";
	}
	
	private function _build_section($s) {
		return "\n[". $s ."]\n";
	}
	
	
	public function defaults() {
		return $this->_ini["DEFAULT"];
	}
	
	
	public function sections() {
		return array_diff(array_keys($this->_ini). array('DEFAULT'));
	}
	
	
	public function add_section($section) {
		$this->_ini[$section] = array();
	}
	
	
	public function has_section($section) {
		return array_key_exists($section, $this->_ini);
	}
	
	
	public function options($section) {
		return $this->_ini[$section];
	}
	
	
	public function has_option($section, $option) {
		return array_key_exists($option, $this->_ini[$section]);
	}
	
	
	public function set($section, $option, $value) {
		$this->_ini[$section][$option] = $value;
	}
	
	
	public function remove_option($section, $option) {
		unset($this->_ini[$section][$option]);
	}
	
	
	public function remove_section($section) {
		unset($this->_ini[$section]);
	}
}