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? ??? ?? PHP ???? PHP ?? PHP ??? ??

PHP ?? PHP ??? ??

Jul 25, 2016 am 09:13 AM

1. ?? ??? ??? ??? ?????

??? ?? ??? ??? ??? ??? ?? ??? ???? ??? ?????? ?? ?? ????. ??? ??? ??? ???? ?? ??? ? ???? ?? ? ????. ?? ??? ??? ?? ?? ??? ?? ????? ??? ??, ?? ??? ??? ?? ?? ??? ??? ? ????. ??? ???? ?? ??? ?? ??????. ?? ?? ??????? (??? ??) ??? ?????.

2. ??? ??

  3. // Database ???? ?? DB ??? ?????.

  4. class Database{
  5. // ?? ?? ?? ???? ??
  6. private static $_instance = null;
  8. // ???? ???? ?? ???? ???? ????.
  9. private function __construct()
  10. {
  11. echo 'constructor';
  12. }

  13. // ??? ????? ???? ???

  14. public static function getInstance()
  15. {
  16. if (!(self::$_instance instanceof ??????)) {
  17. self::$_instance = new Database();
  18. }
  20. return self::$_instance;
  21. }
  22. }

  23. $database = Database::getInstance();

  24. var_dump($database);

?? ??

??: ??? ??? ???? ? ?? ????? ??? ? ????. ??? ???? ?? ?? ??? ? ????? ???? ??? ??? ? ??? ? ?? ??? ????? ???? ??? ??? ???? ????(????? ??? ?? ??).

?? ??? ??? ? ????? ????.

  2. ?? ??? {
  3. private static $_instance = null;
  5. public static function getInstance() {
  6. $class = __CLASS__;
  8. if(!(self::$_instance ????of $class)) {
  9. self::$_instance = new $class;
  10. }
  12. return self:: $_instance;
  13. }
  15. }
  16. ??? DB {
  17. }
  19. ??? DBWriteConnection ?? DB {
  20. ??? ??;
  22. ???? ?? __construct () {
  23. echo 'DBWriteConnection
    ';
  24. }
  25. }
  27. class DBReadConnection ?? DB {
  28. ??? ??;
  30. ?? ?? __construct () {
  31. echo 'DBReadConnection
    ';
  32. }
  33. }
  35. $dbWriteConnection = DBWriteConnection::getInstance();
  36. var_dump($dbWriteConnection);
?? ??

3. ????? ?? ????? ??? ??? ??? ? ??? ??? ????? ???? ??? ? ?? ????? ??? ? ??? ?? ??? ?? ?? ??????(?? ?? ????? ?? ? ?? ??????).

?? ???:

  3. class Registry {

  4. /**
  5. * @var array ?? ??? ???? ???
  6. */
  7. static private $_store = array() ;
  9. /**
  10. * ?????? ?? ??
  11. *
  12. * ??? ???? ??? ??? ??? ?????.
  13. *
  14. * @param mix $object ??? ??
  15. * @param string $name ??? ???? ? ???? ??
  16. * @return void
  17. * @throws Exception
  18. */
  19. static public function add($object, $name = null)
  20. {
  21. // ??? ???? ?? ?? ??? ??? ???? ???? ????????.
  22. $name = (!is_null($name)) ?$name:get_class($object);
  23. if (isset(self::$_store[$name])) {
  24. throw new Exception( "??? ?? ?????? ?????.");
  25. }
  27. self::$_store[$name]= $object;
  28. }
  30. /**
  31. * ??????? ?? ????
  32. *
  33. * @param string $name ?? ??, {@see self::set()}
  34. * @return Mixed
  35. * @throws ??
  36. */
  37. ?? ?? ?? get($name)
  38. {
  39. if (!self::contains($name)) {
  40. throw new Exception("??? ?????? ???? ????.");
  41. }

  42. return self::$_store[$name];

  43. }
  45. /**
  46. * ?????? ??? ??? ??
  47. *
  48. * @param string $name ?? ??, {@see self::set()}
  49. * @return bool
  50. */
  51. ?? ?? ???? ??? ?????. ($name)
  52. {
  53. if (!isset(self::$_store[$name])) {
  54. return false;
  55. }
  57. return true;
  58. }
  60. /**
  61. * ??????? ?? ??
  62. *
  63. * @param string $name ?? ??, {@see self::set()}
  64. * @returns void
  65. */
  66. ?? ?? ?? ??($name)
  67. {
  68. if (self::contains($name)) {
  69. unset( self::$_store[$name]);
  70. }
  71. }
  72. }

?? ??

??? ????? Registry ???? ?????.

  3. require 'Registry.php';

  4. class DBReadConnection {}

  5. class DBWriteConnection {}

  6. $read = new DBReadConnection;

  7. Registry::add($read);

  8. $write = new DBWriteConnection;

  9. Registry::add($write);

  10. // ?? ????? ????? ?????:

  11. $read = Registry::get( 'DBReadConnection');
  12. $write = ?????::get('DBWriteConnection');

  13. var_dump($read);

  14. var_dump($write);

?? ??

??? ??? ????? ??? ???? ????, ???? ?????? ?? ???? ????.

?? ??:

  3. require 'Registry.php';

  4. ?? ??? DBConnection {

  5. static public function getInstance($name = null)
  6. {
  7. // __CLASS__? ?? ?? ??? ??? ?????.
  8. $class = get_called_class();
  9. // ?? ?? ?? ?? ????? ????
  10. // ??? ???? ??? ????? ?????.
  11. $name = (!is_null($name)) ? $name:$class;
  12. if (!Registry ::contains($name)) {
  13. $instance = new $class();
  14. Registry::add($instance, $name);
  15. }
  16. return Registry::get($ name);
  17. }
  18. }

  19. class DBWriteConnection? DBConnection? ?????. {

  20. public function __construct()
  21. {
  22. echo 'DBWriteConnection
  23. }
  24. }

  25. class DBReadConnection? DBConnection? ?????. {

  26. ?? ?? __construct()
  27. {
  28. echo 'DBReadConnection
  29. }
  30. }

  31. $dbWriteConnection = DBWriteConnection::getInstance('abc');

  32. var_dump($dbWriteConnection);
  33. $dbReadConnection = DBReadConnection::getInstance();
  34. var_dump($dbReadConnection);

?? ??

4.?? ?? ?? ??? ??? ? ?? ? ???? ??? ????? ??? ?????. ????? ??? ?? ???? ?????? ???? ??? ????? ?? ??? ??? ?????.

????? ?? ??? ?? ???? ??? ??? ??? ???? ?? ?? ??? ????? ? ?? ?????. ?? ?? ??? ??, ?? ?? ?? ???? ??? ????. ??? ??? ?? ? ??? ?? ?? ??? ??? ??? ??? ??? ???? ? ??? ????.

  2. /**
  3. * ?? ???
  4. *
  5. * ??, mysql ?? sqlite ?? ?? ? ??
  6. */
  7. class Log_Factory {
  8. /**
  9. * ?? ?? ????
  10. *
  11. * @param string $type ?? ??? ??, ??, mysql ?? sqlite
  12. * @param array $options ?? ??? ??
  13. */
  14. ?? ?? getLog( $type = 'file', array $options)
  15. {
  16. // ??? ???? ???
  17. $type = strtolower($type);
  19. // ??? ?? ??
  20. $class = "Log_" .ucfirst($type);
  21. require_once str_replace('_', DIRECTORY_SEPARATOR, $class) '.php';
  23. // ????????. ???? ???? ??? ??? ??
  24. $log = new $class($options);
  25. ???($type) {
  26. ??? 'file':
  27. $log->setPath($options[ 'location']);
  28. break;
  29. case 'mysql':
  30. $log->setUser($options['username']);
  31. $log->setPassword($options ['password']);
  32. $log->setDBName($options['location']);
  33. break;
  34. case 'sqlite':
  35. $log->setDBPath($ options['location']);
  36. break;
  37. }
  39. return $log;
  40. }
  41. }
?? ??

5. ?? ?? ?? ??? ???? ?? ???? ??? ?? ??? ??? ??? ???? foreach? ??? ??? ? ????. ?? foreach ??? ????? ??? ???? ??? ??? ? ????.

(1) Iterator ????? ??

  3. class BasicIterator? Iterator? ?????. {

  4. private $key = 0;
  5. private $data = array(
  6. "hello",
  7. "world",
  8. );

  9. ?? ?? __construct() {

  10. $this->key = 0;
  11. }

  12. ?? ?? rewind() {

  13. $this->key = 0;
  14. }

  15. () {

  16. return $this->data[$this->key];
  17. }

  18. ?? ?? ?() {

  19. return $this ->key;
  20. }

  21. ?? ?? next() {

  22. $this->key ;
  23. return true;
  24. }

  25. public function valid() {

  26. return isset($this->data[$this->key]);
  27. }
  28. }

  29. $iterator = new BasicIterator();

  30. $iterator->rewind();

  31. do {

  32. $key = $iterator- >key();
  33. $value = $iterator->current();
  34. echo $key .': ' .$value . PHP_EOL;
  35. } while ($iterator->next( ) && $iterator->valid());

  37. $iterator = new BasicIterator();
  38. foreach ($iterator as $key => $value ) {
  39. echo $key .': ' .$value . PHP_EOL;
  40. }

?? ??

(2) RecursiveIteratorIterator? ???? ??? ?????.

  3. $array = array(

  4. "Hello", // ?? 1
  5. array(
  6. " World" // ?? 2
  7. ),
  8. array(
  9. "How", // ?? 2
  10. array(
  11. "are", // ?? 3
  12. "you" / / ?? 3
  13. )
  14. ),
  15. "doing?" // ?? 1
  16. );

  17. $recursiveIterator = new RecursiveArrayIterator($array);

  18. $recursiveIteratorIterator = new RecursiveIteratorIterator($recursiveIterator);

  19. foreach($recursiveIteratorIterator as $key => $value) {

  20. echo "??: " . $recursiveIteratorIterator->getDepth() . PHP_EOL;
  21. echo "?: " . $key . PHP_EOL;
  22. echo "?: " .$value .

?? ??

（3）??FilterIterator迭代器實(shí)現(xiàn)過(guò)濾

  3. class EvenFilterIterator ?? FilterIterator {

  4. /**
  5. * ?? ?? ??
  6. *
  7. * @return bool
  8. */
  9. public function accept()
  10. {
  11. // ?? ???? ?????
  12. $iterator = $this->getInnerIterator();
  14. // ?? ?? ?????
  15. $ key = $iterator->key();
  17. // ?? ? ??
  18. if ($key % 2 == 0) {
  19. return true;
  20. }
  22. false ??;
  23. }
  24. }

  25. $array = array(

  26. 0 => "?????",
  27. 1 => " Everybody Is",
  28. 2 => "??",
  29. 3 => "Amazing",
  30. 4 => "The",
  31. 5 => "Who",
  32. 6 => "Doctor",
  33. 7 => "Lives"
  34. );

  35. // ???? ??? ???

  36. $ iterator = new ArrayIterator($array);

  37. // FilterIterator ???

  38. $filterIterator = new EvenFilterIterator($iterator);

  39. foreach ($filterIterator as $key => $value) {
  40. echo $key .': '. $ ? . PHP_EOL;
  41. }
  42. ?>

復(fù)代碼

(4)RegexIterator迭代器

  4. // RecursiveDirectoryIterator ???
  5. $directoryIterator = new RecursiveDirectoryIterator("./" );

  6. // ????? ???? ?? RecursiveIteratorIterator ??

  7. $recursiveIterator = new RecursiveIteratorIterator($directoryIterator);

  8. // Createa *Iterator*.php ??? ?? ??

  9. $regexFilter = new RegexIterator($recursiveIterator, '/(.*?)Iterator(.*?).php$/');

  10. < p>// ??
  11. foreach ($regexFilter as $key => $file) {
  12. /* @var SplFileInfo $file */
  13. echo $file->getFilename() . PHP_EOL;
  14. }

復(fù)主代碼

功能：找到所有的php文件

(4)LimitItertor迭代器，imageSQL中的LIMIT

  3. // ?? ??

  4. $array = array(
  5. 'Hello',
  6. 'World ',
  7. '???',
  8. '??',
  9. '?',
  10. '??? ???'
  11. );

  12. // ??? ???

  13. $iterator = new ArrayIterator($array);

  14. // ?? 2?? ??? ???? ?? ?? ???? ????

  15. $limitIterator = new LimitIterator($ iterator, 0, 2);

  16. // ??

  17. foreach ($limitIterator as $key => $value) {
  18. echo $key .': '. $ ? . PHP_EOL;
  19. }

復(fù)代碼

6. ??? ??(???)

??? ??? ??? ??????? ?? ???? ??? ? ?? ????? ??? ????? ????.

  3. /**

  4. * ??? ???
  5. *
  6. * ? ???? ???? ??? ???? ??
  7. * ??(FIFO)?? ??? ??? ? ????.
  8. */
  9. ?? ??? {
  10. / **
  11. * @var array ???? ??? ?? => ??
  12. */
  13. static protected $callbacks = array();
  15. /**
  16. * ?? ??
  17. *
  18. * @param string $eventName ??? ??? ??
  19. * @param mix $callback Event_Callback ?? Closure? ????
  20. */
  21. ?? ?? ?? RegisterCallback($eventName, $callback)
  22. {
  23. if (!($callback instanceof Event_Callback) && !($callback instanceof Closure)) {
  24. throw new Exception("??? ??!");
  25. }
  27. $eventName = strtolower($eventName);
  29. self::$callbacks[$eventName][] = $callback;
  30. }
  32. /**
  33. * ??? ???
  34. *
  35. * @param string $eventName ???? ??? ??
  36. * @param mix $data ???? ?? ???
  37. */
  38. static public ?? ???($eventName, $data)
  39. {
  40. $eventName = strtolower($eventName);
  42. if (isset(self::$callbacks[$eventName])) {
  43. foreach (self::$callbacks[$eventName] as $callback) {
  44. self::callback($callback, $data);
  45. }
  46. }
  47. }
  49. / **
  50. * ?? ??
  51. *
  52. * @param mix $callback Event_Callback ?? Closure? ????
  53. * @param mix $data ???? ??? ???
  54. */
  55. ?? ?? ?? ??($callback, $data)
  56. {
  57. if ($callback instanceof Closure) {
  58. $callback($data);
  59. } else {
  60. $callback->run($data);
  61. }
  62. }
  63. }

  64. /**

  65. * ??? ?? ?????
  66. *
  67. * ???? ???? ???? ??
  68. * ?? this? ???? ???? ??? ? ????
  69. *. run ????
  70. * ???? ???? ? ?????.
  71. */
  72. interface Event_Callback {
  73. ?? ?? run($data);
  74. }

  75. /**

  76. * ?? ??
  77. */
  78. class LogCallback? Event_Callback? ?????. {
  79. ?? ?? run($data)
  80. {
  81. echo "?? ???" .
  82. var_dump($data);
  83. }
  84. }

  86. Event::registerCallback('save', new LogCallback());

  87. // ?? ??? ??? ???? ??

  88. ???::registerCallback('save', function ($data) {
  89. echo "?? ???" . PHP_EOL;
  90. var_dump($data);
  91. });

  92. < ;p>class MyDataRecord {
  93. public function save()
  94. {
  95. // ??? ??
  97. // ?? ??? ???
  98. Event::trigger('save', array ("Hello", "World"));
  99. }
  100. }

  101. // ? ??? ??? ?????

  102. $data = new MyDataRecord();
  103. $data->save(); // '??' ???? ??? ?????

?? ??

7. ??? ?? ?? ??? ?? ??? ???? ???? ? ??? ???? ? ???? ???? ??? ? ????.

  3. /**

  4. * ?? ???
  5. */
  6. ??? ?? {
  7. /**
  8. * @var Log_Engine_Interface
  9. */
  10. protected $engine = false;
  12. /**
  13. * ??? ??? ??
  14. *
  15. * @param string $message
  16. */
  17. ?? ?? add($message)
  18. {
  19. if (!$this->engine) {
  20. throw new Exception('??? ? ? ????. ??? ???? ?????.');
  21. }
  23. $data['datetime'] = time();
  24. $data[' message'] = $message;
  26. $session = Registry::get('session');
  27. $data['user'] = $session->getUserId();
  29. $this->engine->add($data);
  30. }
  32. /**
  33. * ?? ??? ?? ?? ??
  34. *
  35. * @param Log_Engine_Interface $Engine
  36. */
  37. ?? ?? setEngine(Log_Engine_Interface $engine)
  38. {
  39. $this->engine = $engine;
  40. }
  42. /**
  43. * ??? ???? ?? ??
  44. *
  45. * @return Log_Engine_Interface
  46. */
  47. ?? ?? getEngine()
  48. {
  49. return $this- >engine;
  50. }
  51. }

  52. interface Log_Engine_Interface {

  53. /**
  54. * ??? ??? ??
  55. *
  56. * @param string $message
  57. */
  58. ?? ?? add(array $data);
  59. }

  60. class Log_Engine_File? Log_Engine_Interface? ?????. {

  61. /**
  62. * ??? ??? ??
  63. *
  64. * @param string $message
  65. */
  66. ?? ?? add(array $data)
  67. {
  68. $line = '[' .data('r', $data['datetime']). '] ' .$data['message'] ' ???: ' .$data['user'] . ??>
  69. $config = Registry::get('site-config');
  71. if (!file_put_contents($config['location'], $line, FILE_APPEND)) {
  72. throw new Exception("??? ?? ?? ??? ??????.");
  73. }
  74. }
  75. }

  76. $engine = new Log_Engine_File();

  77. $log = new Log();

  78. $log->setEngine($engine);

  79. // ?????? ??

  80. Registry::add($log);

?? ??
??? ???? ??? ??? ???? ????. ?? ?? ???? ???. ?? ?? ???? ??? ?? ??? ?????. ?? ?? ???? ???? ?? ???? ??? ???? ??? ???? ?????? ???? ??? ? ??? ?????.

8. ??-?-???? MVC ?????? ??? Model-View-Controller? ??????? ?? ?? ? ?? ?? ?? ??? ???? ?????. ??-??? ?? ?? ?? ???? ???? ????. ??????, ? ??? ?? ??? ? ????. ? ?? ??? ???? ???? ?? ????? ???? ??? ?????. ????-?????? ??? ???? ???? ??? ?? ?? ??? ???? ??? ???? ??? ?, ?? ???? ?? ??? ????? ?????.

???? MVC ???? ?????:

php mvc架構(gòu)圖 9. ??? ??

??? ?? ???? ??? ?? ??? ??????.

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? ?? ??? ????? ???? ??? ??????, ???? ?????? ????. ? ???? ?? ???? ?? ??? ?? ????. ???? ??? ???? ???? ??? ?? admin@php.cn?? ?????.

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