gist:6200838

## gistfile1.txt
<?php

use PHPUnit_Framework_TestCase as BaseTestCase;

class TestFixer extends BaseTestCase
{
    public function fix(&$target, $source, $keep = false) {
        if (!$source) {
            return;
        }
        $keys = array();

        $source = preg_replace_callback(
            '/
            # Match at start of string or &
            (?:^|(?<=&))
            # Exclude cases where the period is in brackets, e.g. foo[bar.blarg]
            [^=&\[]*
            # Affected cases: periods and spaces
            (?:\.|%20)
            # Keep matching until assignment, next variable, end of string or
            # start of an array
            [^=&\[]*
            /x',
            function ($key) use (&$keys) {
                $keys[] = $key = base64_encode(urldecode($key[0]));
                return urlencode($key);
            },
        $source
        );

        if (!$keep) {
            $target = array();
        }

        parse_str($source, $data);
        foreach ($data as $key => $val) {
            // Only unprocess encoded keys
            if (!in_array($key, $keys)) {
                $target[$key] = $val;
                continue;
            }

            $key = base64_decode($key);
            $target[$key] = $val;

            if ($keep) {
                // Keep a copy in the underscore key version
                $key = preg_replace('/(\.| )/', '_', $key);
                $target[$key] = $val;
            }
        }
    }

    public function dataForTestFix()
    {
        return array(
            // Simple cases
            ['foo=bar', ['foo' => 'bar']],
            ['foo=foo.bar', ['foo' => 'foo.bar']],
            ['foo=foo.bar[]', ['foo' => 'foo.bar[]']],
            ['foo[]=bar', ['foo' => ['bar']]],
            ['foo.bar', ['foo.bar' => '']],
            ['foo.bar[]', ['foo.bar' => ['']]],
            ['foo%20bar', ['foo bar' => '']],
            ['foo%20bar[]', ['foo bar' => ['']]],
            ['foo[foo.bar]=bar', ['foo' => ['foo.bar' => 'bar']]],
            ['foo[foo%20bar]=bar', ['foo' => ['foo bar' => 'bar']]],

            // Simple cases with keeping
            ['foo=bar', ['foo' => 'bar'], true],
            ['foo=foo.bar', ['foo' => 'foo.bar'], true],
            ['foo=foo.bar[]', ['foo' => 'foo.bar[]'], true],
            ['foo[]=bar', ['foo' => ['bar']], true],
            ['foo.bar', ['foo_bar' => '', 'foo.bar' => ''], true],
            ['foo.bar[]', ['foo_bar' => [''], 'foo.bar' => ['']], true],
            ['foo%20bar', ['foo_bar' => '', 'foo bar' => ''], true],
            ['foo%20bar[]', ['foo_bar' => [''], 'foo bar' => ['']], true],
            ['foo[foo.bar]=bar', ['foo' => ['foo.bar' => 'bar']], true],
            ['foo[foo%20bar]=bar', ['foo' => ['foo bar' => 'bar']], true],

            // Duplicates if cast to "_"
            ['foo.bar=blarg1&foo_bar=blarg2&foo%20bar=blarg3', ['foo.bar' => 'blarg1', 'foo_bar' => 'blarg2', 'foo bar' => 'blarg3']],
            ['foo.bar=blarg1&foo_bar=blarg2&foo%20bar=blarg3', ['foo_bar' => 'blarg3', 'foo.bar' => 'blarg1', 'foo bar' => 'blarg3'], true],

            array(
                'foo%20bar=blarg&foo[bar][blarg.bar]=bar&foo.bar=blarg&foobar.blarg[]=bar&blarg.foo&blargfoo.bar[asdf]=w00t&normal=normal',
                array(
                    'foo bar' => 'blarg',
                    'foo' => array(
                        'bar' => array(
                            'blarg.bar' => 'bar',
                        ),
                    ),
                    'foo.bar' => 'blarg',
                    'foobar.blarg' => array('bar'),
                    'blarg.foo' => null,
                    'blargfoo.bar' => array(
                        'asdf' => 'w00t',
                    ),
                    'normal' => 'normal',
                )
            ),
        );
    }

    /**
     * @dataProvider dataForTestFix
     */
    public function testFixWorks($string, $target, $keep = false)
    {
        parse_str($string, $source);
        $this->fix($source, $string, $keep);
        $this->assertEquals($source, $target);
    }
}