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<?php /* Name : phpA/B v1.2 Author : Brian Cray License : GPL 2.0 License URL : http://www.gnu.org/licenses/gpl-2.0.html URL : phpabtest.com / class phpab { private $variations = array(); private $current_variation = '!unset'; private $current_variation_key; private $test_name; private $test_ran = FALSE; private $trial_mode = FALSE; private $content; private $tag = 'phpab'; private $auto_ga = TRUE; private $ga_slot = 1; private $test_domain; private $detect_bots = TRUE; private $is_bot = FALSE; private $version = '1.2'; function __construct ($n, $t = FALSE) { if($this->detect_bots == TRUE) { $bots = array('googlebot', 'msnbot', 'slurp', 'ask jeeves', 'crawl', 'ia_archiver', 'lycos'); foreach($bots as $botname) { if(stripos($_SERVER['HTTP_USER_AGENT'], $botname) !== FALSE) { $this->trial_mode = TRUE; $this->is_bot = TRUE; break; } } } if($this->is_bot == FALSE) { $this->trial_mode = $t; } ob_start(array($this, 'execute')); $this->test_domain = '.' . $_SERVER['HTTP_HOST']; $n = trim(strtolower($n)); $n = preg_replace('/[^a-z0-9 _]/', '', $n); $n = str_replace(' ', '_', $n); $this->test_name = $n; } function __destruct () { if (ob_get_contents()) ob_end_flush(); } private function grab_content () { if(empty($this->content)) { $this->content = ob_get_contents(); } } private function setup_ga () { $try_auto = FALSE; $sync = '{' . $this->tag . ' ' . $this->test_name . ' ga_sync}'; $async = '{' . $this->tag . ' ' . $this->test_name . ' ga_async}'; $syncPos = strpos($this->content, $sync); if($syncPos !== FALSE) { $this->content = str_replace($sync, 'pageTracker._setCustomVar(' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3);', $this->content); } else { $asyncPos = strpos($this->content, $async); if($asyncPos !== FALSE) { $this->content = str_replace($async, '_gaq.push(["_setCustomVar", ' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3]);', $this->content); } else { $try_auto = TRUE; } } if($this->auto_ga == TRUE && $try_auto == TRUE) { $sync = strpos($this->content, 'pageTracker._trackPageview'); if($sync === FALSE) { $async = preg_match('/_gaq\.push$\[[\'\"]_trackPageview[\'\"]\]$/', $this->content, $matches, PREG_OFFSET_CAPTURE); if($async == FALSE) { $auto_fail = TRUE; $async = FALSE; } else { $auto_fail = FALSE; $async = $matches[0][1]; } } else { $auto_fail = FALSE; } if($auto_fail === FALSE && $sync !== FALSE) { $this->content = substr($this->content, 0, $sync - 1) . 'pageTracker._setCustomVar(' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3);' . substr($this->content, $sync); } elseif($auto_fail === FALSE && $async !== FALSE) { $this->content = substr($this->content, 0, $async - 1) . ' _gaq.push(["_setCustomVar", ' . $this->ga_slot . ', "' . $this->test_name . '", "' . $this->current_variation . '", 3]); ' . substr($this->content, $async); } } } private function record_user_segment () { $cookie_domain = (($colon_position = strrpos($this->test_domain, ":")) === false) ? $this->test_domain : substr($this->test_domain, 0, $colon_position); setcookie($this->tag . '-' . $this->test_name, $this->current_variation, time() + (60 * 60 * 24 * 365), '/', $cookie_domain); } public function set_domain ($d) { $this->test_domain = !empty($d) ? $d : '.' . $_SERVER['HTTP_HOST']; } public function set_ga_slot ($s) { $this->ga_slot = $s; } public function set_ga_mode ($m) { $this->ga_auto = $m; } public function set_tag ($t) { $this->tag = $t; } public function add_variation ($n, $v = '') { $n = trim(strtolower($n)); $n = preg_replace('/[^a-z0-9 _]/', '', $n); $n = str_replace(' ', '_', $n); array_push($this->variations, array('name' => $n, 'value' => $v)); } public function get_user_segment () { if($this->current_variation != '!unset' && $this->current_variation_key != -1) { return $this->current_variation; } if ($this->is_bot == TRUE) { $this->current_variation = 'control'; return $this->current_variation; } if (get_magic_quotes_gpc() == TRUE) { $_COOKIE[$this->tag . '-' . $this->test_name] = stripslashes($_COOKIE[$this->tag . '-' . $this->test_name]); } if($this->trial_mode == FALSE) { $key = $this->tag . '-' . $this->test_name; if(array_key_exists($key, $_COOKIE)) { $this->current_variation = $_COOKIE[$key]; } if(empty($this->current_variation)) { $this->current_variation = '!unset'; } } else { $this->current_variation = '!unset'; } array_unshift($this->variations, array('name' => 'control', 'value' => '')); $valid = FALSE; $this->current_variation_key = 0; foreach($this->variations as $n => $v) { if($v['name'] == $this->current_variation) { $valid = TRUE; break; } $this->current_variation_key++; } if($this->current_variation == '!unset' \|\| $valid == FALSE) { srand((double)microtime() 1000003); $this->current_variation_key = array_rand($this->variations); $this->current_variation = $this->variations[$this->current_variation_key]['name']; } return $this->current_variation; } public function execute ($buffer) { $this->content = $buffer; if($this->test_ran == FALSE) { $this->run_test(); } if($this->trial_mode != TRUE) { $this->setup_ga(); } $tmp = $this->content; $this->content = preg_replace('/<body([^>]?)class="([^"]?)"([^>]?)>/i', '<body${1}class="${2} ' . $this->tag . '-' . $this->current_variation . '"${3}>', $this->content); if($tmp == $this->content) { $this->content = preg_replace('/<body([^>]?)>/i', '<body${1} class="' . $this->tag . '-' . $this->current_variation . '">', $this->content); } unset($tmp); $pos = strrpos($this->content, '</body>'); if($pos !== false) { $this->content = substr_replace($this->content, '<!--A/B tests active with phpA/B ' . $this->version . '--></body>', $pos, strlen('</body>')); } $this->content = str_replace('{' . $this->tag . ' ' . $this->test_name . ' current_varation}', $this->current_variation, $this->content); if($this->trial_mode != TRUE) { $this->record_user_segment(); } return $this->content; } public function run_test () { $this->get_user_segment(); $this->grab_content(); $open_tag = '{' . $this->tag . ' ' . $this->test_name . '}'; $close_tag = '{/' . $this->tag . ' ' . $this->test_name . '}'; $test_open = strpos($this->content, $open_tag); $test_close = strpos($this->content, $close_tag); while($test_open !== FALSE) { if($this->current_variation != 'control') { if($test_close === FALSE && $test_open !== FALSE) { $this->content = substr_replace($this->content, $this->variations[$this->current_variation_key]['value'], $test_open, strlen($open_tag)); } elseif($test_close !== FALSE && $test_open !== FALSE) { $diff = $test_close + strlen($close_tag) - $test_open; $this->content = substr_replace($this->content, $this->variations[$this->current_variation_key]['value'], $test_open, $diff); } else { } } else { $this->content = str_replace($open_tag, $this->variations[$this->current_variation_key]['value'], $this->content); $this->content = str_replace($close_tag, '', $this->content); } $test_open = strpos($this->content, $open_tag, $test_open); $test_close = strpos($this->content, $close_tag, $test_open); } $this->test_ran = TRUE; } }

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