* @since 2.0 */ class BaseVarDumper { private static $_objects; private static $_output; private static $_depth; /** * Displays a variable. * This method achieves the similar functionality as var_dump and print_r * but is more robust when handling complex objects such as Yii controllers. * @param mixed $var variable to be dumped * @param integer $depth maximum depth that the dumper should go into the variable. Defaults to 10. * @param boolean $highlight whether the result should be syntax-highlighted */ public static function dump($var, $depth = 10, $highlight = false) { echo static::dumpAsString($var, $depth, $highlight); } /** * Dumps a variable in terms of a string. * This method achieves the similar functionality as var_dump and print_r * but is more robust when handling complex objects such as Yii controllers. * @param mixed $var variable to be dumped * @param integer $depth maximum depth that the dumper should go into the variable. Defaults to 10. * @param boolean $highlight whether the result should be syntax-highlighted * @return string the string representation of the variable */ public static function dumpAsString($var, $depth = 10, $highlight = false) { self::$_output = ''; self::$_objects = []; self::$_depth = $depth; self::dumpInternal($var, 0); if ($highlight) { $result = highlight_string("/', '', $result, 1); } return self::$_output; } /** * @param mixed $var variable to be dumped * @param integer $level depth level */ private static function dumpInternal($var, $level) { switch (gettype($var)) { case 'boolean': self::$_output .= $var ? 'true' : 'false'; break; case 'integer': self::$_output .= "$var"; break; case 'double': self::$_output .= "$var"; break; case 'string': self::$_output .= "'" . addslashes($var) . "'"; break; case 'resource': self::$_output .= '{resource}'; break; case 'NULL': self::$_output .= "null"; break; case 'unknown type': self::$_output .= '{unknown}'; break; case 'array': if (self::$_depth <= $level) { self::$_output .= '[...]'; } elseif (empty($var)) { self::$_output .= '[]'; } else { $keys = array_keys($var); $spaces = str_repeat(' ', $level * 4); self::$_output .= '['; foreach ($keys as $key) { self::$_output .= "\n" . $spaces . ' '; self::dumpInternal($key, 0); self::$_output .= ' => '; self::dumpInternal($var[$key], $level + 1); } self::$_output .= "\n" . $spaces . ']'; } break; case 'object': if (($id = array_search($var, self::$_objects, true)) !== false) { self::$_output .= get_class($var) . '#' . ($id + 1) . '(...)'; } elseif (self::$_depth <= $level) { self::$_output .= get_class($var) . '(...)'; } else { $id = array_push(self::$_objects, $var); $className = get_class($var); $spaces = str_repeat(' ', $level * 4); self::$_output .= "$className#$id\n" . $spaces . '('; foreach ((array) $var as $key => $value) { $keyDisplay = strtr(trim($key), "\0", ':'); self::$_output .= "\n" . $spaces . " [$keyDisplay] => "; self::dumpInternal($value, $level + 1); } self::$_output .= "\n" . $spaces . ')'; } break; } } /** * Exports a variable as a string representation. * * The string is a valid PHP expression that can be evaluated by PHP parser * and the evaluation result will give back the variable value. * * This method is similar to `var_export()`. The main difference is that * it generates more compact string representation using short array syntax. * * It also handles objects by using the PHP functions serialize() and unserialize(). * * PHP 5.4 or above is required to parse the exported value. * * @param mixed $var the variable to be exported. * @return string a string representation of the variable */ public static function export($var) { self::$_output = ''; self::exportInternal($var, 0); return self::$_output; } /** * @param mixed $var variable to be exported * @param integer $level depth level */ private static function exportInternal($var, $level) { switch (gettype($var)) { case 'NULL': self::$_output .= 'null'; break; case 'array': if (empty($var)) { self::$_output .= '[]'; } else { $keys = array_keys($var); $outputKeys = ($keys !== range(0, count($var) - 1)); $spaces = str_repeat(' ', $level * 4); self::$_output .= '['; foreach ($keys as $key) { self::$_output .= "\n" . $spaces . ' '; if ($outputKeys) { self::exportInternal($key, 0); self::$_output .= ' => '; } self::exportInternal($var[$key], $level + 1); self::$_output .= ','; } self::$_output .= "\n" . $spaces . ']'; } break; case 'object': try { $output = 'unserialize(' . var_export(serialize($var), true) . ')'; } catch (\Exception $e) { // serialize may fail, for example: if object contains a `\Closure` instance // so we use regular `var_export()` as fallback $output = var_export($var, true); } self::$_output .= $output; break; default: self::$_output .= var_export($var, true); } } }