sample implementation of path segment encode with benchmark

path_segment_encode.php

<?php

class PathSegmentEncode
{
    /**
     * Map of allowed special chars in path segments.
     *
     * http://tools.ietf.org/html/rfc3986#appendix-A
     * segement      = *pchar
     * pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
     * unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"
     * sub-delims    = "!" / "$" / "&" / "'" / "(" / ")"
     *               / "*" / "+" / "," / ";" / "="
     *
     * @var array
     */
    private static $_correctMap = array(
        '%21' => "!", // sub-delims
        '%24' => "$", // sub-delims
        '%26' => "&", // sub-delims
        '%27' => "'", // sub-delims
        '%28' => "(", // sub-delims
        '%29' => ")", // sub-delims
        '%2A' => "*", // sub-delims
//      '%2B' => "+", // sub-delims - special value for php/urlencode
        '%2C' => ",", // sub-delims
//      '%2D' => "-", // unreserved - not touched by urlencode
//      '%2E' => ".", // unreserved - not touched by urlencode
        '%3A' => ":", // pchar
        '%3B' => ";", // sub-delims
        '%3D' => "=", // sub-delims
        '%40' => "@", // pchar
//      '%5F' => "_", // unreserved - not touched by urlencode
        '%7E' => "~", // unreserved
    );
    
    public function correct($raw)
    {
        return strtr(
            urlencode($raw),
            self::$_correctMap
        );
    }
    
    public function urlencode($raw)
    {
        return urlencode($raw);
    }
}
$encoder = new PathSegmentEncode();

$functions = array(
    array(
        'name' => 'urlencode',
        'call' => array($encoder, 'urlencode'),
        'time' => 0.0,
        'rate' => 0.0,
    ),
    array(
        'name' => 'PathSegmentEncode::correct',
        'call' => array($encoder, 'correct'),
        'time' => 0.0,
        'rate' => 0.0,
    ),
);

$testValues = array(
    'nothing-todo-here',
    'Hello World!',
    '!"§$%&/()=?.,;-_\'*+"',
    '0123456789',
    'this is some real long test string wich contains all some ugly chars !"§$%&/()=?.,;-_\'*+" 0123456789'
);
for ($i = 0; $i < 1000; ++$i) {
    foreach ($testValues as $testValue) {
        foreach ($functions as $key => $function) {
            $call = $function['call'];
            $time = microtime(true);
            $return = call_user_func($call, $testValue);
            $time = microtime(true) - $time;
            $functions[$key]['time'] += $time;
        }
    }
}

$minTime = microtime(true);
foreach ($functions as $function) {
    $minTime = min($function['time'], $minTime);
}
foreach ($functions as $key => $function) {
    $functions[$key]['rate'] = $functions[$key]['time'] / $minTime;
}

foreach ($functions as $function) {
    printf(
        "function: %s\n  time: %fms\n  rate: %f%%\n",
        $function['name'],
        $function['time'] * 1000,
        $function['rate'] * 100
    );
}