simple php reader/writer

ini.php

<?php

class MyIni {
    protected $file;
    protected $section_endings;
    protected $keys;

    function __construct($filename) {
        $this->file = file($filename);
        $this->_parse();
    }

    protected function _parse() {
        // Default to global section if no section has been found
        $section = "global";
        $this->section_endings = array();
        $this->keys = array();

        foreach ($this->file as $lineno => $line) {
            if (preg_match('/\[([^\]]+)\]/', $line, $match)) {
                // Found a new section
                $section = $match[1];
            } else {
                // Found a key = val pair
                if (preg_match('/^([a-z0-9_.\[\]-]+)\s*=\s*(.*)$/i', $line, $match)) {
                    $this->keys[$section.".".$match[1]] = array(
                        // Save offset for this key
                        'offset' => $lineno,
                        'value' => $match[2]
                    );
                }
            }

            // Assume that this line is the last line of a section, skip empty lines though
            $line = trim($line);
            if (! empty($line)) {
                $this->section_endings[$section] = $lineno;
            }
        }
    }

    // Check if we match a pattern in our keys
    function match($pattern) {
        $ret = array();
        foreach ($this->keys as $k => $v) {
            // Simple filename match is sufficient
            if (fnmatch($pattern, $k)) {
                $ret[$k] = $v['value'];
            }
        }
        return $ret;
    }

    // Returns the key part of a string (section.key.with.dots => key.with.dots)
    protected function _getKey($key) {
        list ($section, $key) = explode(".", $key, 2);
        if (! isset($key)) {
            $key = $section;
        }
        return $key;
    }

    // Returns the section part of a string (section.key => section), or
    // "global" when no section has been found.
    protected function _getSection($key) {
        list ($section, $key) = explode(".", $key, 2);
        if (! isset($key)) {
            $section = "global";
        }
        return $section;
    }


    // Adds - or updates - a key with a new value. Key is formatted like: section.key
    function add($key, $val) {
        // Build actual line
        $line = $this->_getKey($key) . " = " . $val . "\n";

        if (isset($this->keys[$key])) {
            // Key is present, just change the line

            // update in the keys
            $this->keys[$key]['value'] = $val;

            // update in the file too so both are in sync
            $offset = $this->keys[$key]['offset'];
            $this->file[$offset] = $line;
        } else {
            // Key not found. We need to add the key (and possibly the section too)

            // Separate the section from the key
            $section = $this->_getSection($key);


            if (isset($this->section_endings[$section])) {
                // Section exists, just add the key to the end of this section
                $offset = $this->section_endings[$section] + 1;
            } else {
                // Section not found, add it to the end of the file
                end($this->file);
                $offset = key($this->file) + 1;

                // Create new section first by adding them
                array_splice($this->file, $offset++, 0, "\n");
                array_splice($this->file, $offset++, 0, "[".$section."]\n");
            }

            // Just add the new line
            array_splice($this->file, $offset++, 0, $line);

            // Reparse everything.
            $this->_parse();
            print_r($this->keys);
        }
    }

    function remove($key) {
        if (isset($this->keys[$key])) {
            $offset = $this->keys[$key]['offset'];
            unset($this->file[$offset]);
            unset($this->keys[$key]);

            // Reparse. Needed so our line numbering is correct again
            $this->_parse();
        }
    }

    function save($destination) {
        $f = fopen($destination, "w");
        foreach ($this->file as $lineno => $line) {
            fwrite($f, $lineno.": ".$line);
        }
        fclose($f);
    }
}



$ini = new MyIni("/etc/saffire/saffire.ini");
print_r($ini->match("fastcgi.*"));
print_r($ini->match("fastcgi.log.*"));
print_r($ini->match("*socket*"));

print_r($ini->match("*gpg*"));
$ini->remove("gpg.path");
print_r($ini->match("*gpg*"));
$ini->add("gpg.anotherkey", "wootwoot");
print_r($ini->match("*gpg*"));

$ini->add("compile.sign", "false");
$ini->add("fastcgi.listen.backlog", "1234");

$ini->add("repl.ps3", "asfasdfas");

$ini->add("global.test", "ok");
$ini->add("blaat.work", "it");

$ini->add("anohersection.foo", "aa");
$ini->add("anohersection.bar", "yes");

$ini->save("php://stdout");

exit;