School of PHP Magic

"The closer you are, the less you see"

How often do you think you know a lot about PHP magic? And what if I tell you that you just did not look carefully? After all, the more you think that you know everything, the easier it is to deceive you. Look carefully, because the closer you are, the less you see.

The school of PHP magic opens its doors. Let's run beyond the established boundaries of OOP rules and make the impossible possible. And who knows, maybe you will love this magic: magic methods, non-standard ways of accessing properties, changing contexts, aspect-oriented programming, streaming filters, and more.

Transcript

1. School of PHP Magic Alexander Lisachenko
2. ‣ Head of Web Development at Alpari (RU) Forex Broker ‣ Have worked with computers since 7 years old ‣ Clean code advocate, guru in enterprise architecture ‣ Author of the aspect-oriented framework Go! AOP 
 http://go.aopphp.com About me: 2 lisachenko lisachenko
3. Moscow PHP User Group 3
4. Moscow PHP User Group 3
5. 4 «The closer you think you are, the less you'll actually see.»
6. The Trick 5
7. The Trick 5
8. The Trick 6 …an action that is intended to deceive, either as a way of cheating someone, or as a joke or form of entertainment
9. 7 One of the trickiest programming language.
10. 8 Magic equipment
11. 9 Magic equipment
12. 9 Magic equipment __construct(), __destruct(), __clone(),
13. 9 Magic equipment __construct(), __destruct(), __clone(), __call(), __callStatic(),
14. 9 Magic equipment __construct(), __destruct(), __clone(), __call(), __callStatic(), __get(), __set(), __isset(), __unset(),
15. 9 Magic equipment __construct(), __destruct(), __clone(), __call(), __callStatic(), __get(), __set(), __isset(), __unset(), __sleep(), __wakeup(),
16. 9 Magic equipment __construct(), __destruct(), __clone(), __call(), __callStatic(), __get(), __set(), __isset(), __unset(), __sleep(), __wakeup(), __toString(), __invoke(), __set_state(),
17. 9 Magic equipment __construct(), __destruct(), __clone(), __call(), __callStatic(), __get(), __set(), __isset(), __unset(), __sleep(), __wakeup(), __toString(), __invoke(), __set_state(), __debugInfo()
18. 10 Magic equipment
19. 10 Magic equipment declare(ticks=1)
20. 10 Magic equipment declare(ticks=1) debug_backtrace()
21. 10 Magic equipment declare(ticks=1) debug_backtrace() unset(), isset()
22. 10 Magic equipment declare(ticks=1) debug_backtrace() unset(), isset() by-reference passing
23. 10 Magic equipment declare(ticks=1) debug_backtrace() unset(), isset() by-reference passing bound closures
24. 10 Magic equipment declare(ticks=1) debug_backtrace() unset(), isset() by-reference passing bound closures Reflection API
25. 10 Magic equipment declare(ticks=1) debug_backtrace() unset(), isset() by-reference passing bound closures Reflection API StreamWrapper API
26. 11 So, let’s start our magic!
28. 12 Rule #1 of magic…
29. 12 Rule #1 of magic…
31. 13 …always be the smartest guy in the room.
32. 13 …always be the smartest guy in the room.
34. 14 Trick #1: Impossible comparison
35. 14 Trick #1: Impossible comparison
36. 14 Trick #1: Impossible comparison
37. 15 Trick #1.1: Not-a-number
38. 15 Trick #1.1: Not-a-number
39. 16 Trick #1.2: Constant redefinition
40. 16 Trick #1.2: Constant redefinition
41. 17 Trick #1.3: Tick handler
42. 17 Trick #1.3: Tick handler
43. 18 Trick #2.1: Magic expressions
44. 18 Trick #2.1: Magic expressions
45. 18 Trick #2.1: Magic expressions
46. 19 True?
47. 20 False?
49. 22 Trick #2.1: Operator precedence
50. 22 Trick #2.1: Operator precedence Top priority
51. 23 Trick #2.2: Magic expressions
52. 23 Trick #2.2: Magic expressions
53. 23 Trick #2.2: Magic expressions
54. 23 Trick #2.2: Magic expressions
55. 24 Trick #2.2: Magic expressions
56. 24 Trick #2.2: Magic expressions 1) $factory will be used as a class name for «new»
57. 24 Trick #2.2: Magic expressions 1) $factory will be used as a class name for «new» 2) Parse error will be thrown
58. 24 Trick #2.2: Magic expressions 1) $factory will be used as a class name for «new» 2) Parse error will be thrown 3) Result of method $factory->build() will be used
59. 24 Trick #2.2: Magic expressions 1) $factory will be used as a class name for «new» 2) Parse error will be thrown 3) Result of method $factory->build() will be used 4) Value of property $factory->build will be used
60. 25 Trick #2.2: Magic expressions
61. 25 Trick #2.2: Magic expressions
62. 26 Trick #2.2: Operator precedence
63. 26 Trick #2.2: Operator precedence
64. 27 Trick #2.3: Magic expressions
65. 27 Trick #2.3: Magic expressions
66. 27 Trick #2.3: Magic expressions
67. 28 Trick #2.3: Loophole in parser
69. 29 What is magic?
70. 29 What is magic? Focused deception.
71. 29 What is magic? Focused deception. But deception meant to entertain.
72. 29 What is magic? Focused deception. But deception meant to entertain. Try to remember next one card…
76. 31 I am bad magician :) But let me try…
77. 31 I am bad magician :) But let me try…
78. 32 Trick #3: Breaking the rules
79. 32 Trick #3: Breaking the rules
80. 32 Trick #3: Breaking the rules
82. 33 Who knows how to do this?
83. 33 Who knows how to do this? Who knows two solutions?
84. 33 Who knows how to do this? Who knows two solutions? Who knows three solutions?
85. 33 Who knows how to do this? Who knows two solutions? Who knows three solutions? Who knows more than three?
86. 34 Trick #3.1: Reflection way
87. 34 Trick #3.1: Reflection way
88. Trick #3.2: Bound closure 35
89. Trick #3.2: Bound closure 35
90. Trick #3.2: Bound closure 35
91. Trick #3.3: Unserialisation trick 36
92. Trick #3.3: Unserialisation trick 36
93. Trick #3.3: Unserialisation trick 36
94. Trick #3.3: Unserialisation trick 36
95. Trick #3.4: Can you find it? 37
96. Trick #3: doctrine/instantiator package 38 composer show doctrine/instantiator --all name : doctrine/instantiator descrip. : A small, lightweight utility to instantiate objects in PHP without invoking their constructors keywords : constructor, instantiate type : library license : MIT License (MIT)
97. Trick #4: Intercepting property access 39
98. Trick #4: Intercepting property access 39
99. Trick #4: Intercepting property access 39
100. Trick #4: Intercepting property access 39
101. Trick #4.1: Add magic… getter! 40
102. Trick #4.1: Add magic… getter! 40
103. Trick #4.2: Use previous trick! 41
104. Trick #4.2: Use previous trick! 41
105. Trick #4.3: Unset this private field 42
106. Trick #4.3: Unset this private field 42
107. Trick #4.4: Call private constructor 43
108. Trick #4.4: Call private constructor 43
109. Trick #4: Result 44
110. Trick #4: leedavis/altr-ego package 45 composer show leedavis81/altr-ego --all name : leedavis81/altr-ego descrip. : Access an objects protected / private properties and methods keywords : php, break scope versions : dev-master, v1.0.2, v1.0.1, v1.0.0 type : library license : MIT License (MIT)
111. Trick #5: Immutable objects in PHP? 46
112. Trick #5: Immutable objects in PHP? 46
113. Trick #5: Immutable objects in PHP? 46
114. 47 True?
115. 48 False?
116. 49 Trick #5.1: Immutable object in PHP
117. 50 Trick #5.1: Immutable object in PHP
118. 50 Trick #5.1: Immutable object in PHP Unfortunately, you can’t even read it!
119. 51 Trick #5.2: Immutable object in PHP
120. 51 Trick #5.2: Immutable object in PHP
122. 52 What if we use previous tricks?
123. 52 What if we use previous tricks? Intercept properties.
124. 52 What if we use previous tricks? Intercept properties. Securely store values of properties.
125. 52 What if we use previous tricks? Intercept properties. Securely store values of properties. Provide read-only API.
126. 52 What if we use previous tricks? Intercept properties. Securely store values of properties. Provide read-only API.
127. 52 What if we use previous tricks? Intercept properties. Securely store values of properties. Provide read-only API.
128. 52 What if we use previous tricks? Intercept properties. Securely store values of properties. Provide read-only API.
130. 53 Secure place for values:
131. 53 Secure place for values: Global variables
132. 53 Secure place for values: Global variables Public properties
133. 53 Secure place for values: Global variables Public properties Protected properties
134. 53 Secure place for values: Global variables Public properties Protected properties Private properties
135. 53 Secure place for values: Global variables Public properties Protected properties Private properties Private static properties
136. 53 Secure place for values: Global variables Public properties Protected properties Private properties Private static properties Static variables in functions
137. 53 Secure place for values: Global variables Public properties Protected properties Private properties Private static properties Static variables in functions
138. 54 Trick #5.2: Secure value storage
139. 54 Trick #5.2: Secure value storage
140. 55 Trick #5.2: Use it by-reference
141. 55 Trick #5.2: Use it by-reference
142. 56 Trick #5.2: Set state implementation
143. 56 Trick #5.2: Set state implementation
144. Trick #5.2: Applying object state 57
145. Trick #5.2: Get state implementation 58
146. Trick #5.2: Get state implementation
147. Trick #5.2: And a little bit magic :) 60
148. Trick #5.2: And a little bit magic :) 60
149. Trick #5: lisachenko/immutable-object 61 composer show lisachenko/immutable-object --all name : lisachenko/immutable-object descrip. : Immutable object library keywords : versions : * dev-master type : library license : MIT License (MIT)
150. Trick #5: Usage example 62
151. Trick #5: Usage example 63
152. Trick #5: Try to change it… 64
153. Trick #5: Try to change it… 64
154. Trick #5: Try to change it… 65
155. Trick #5: Try to change it… 65 Maybe you can hack it?
156. Trick #6: It contains anti-XDebug code! 66
157. Trick #7: Stream processing
158. Trick #7: Stream processing
159. Trick #7: Stream processing
160. Trick #7: Stream processing
161. Trick #7: Stream processing
162. Trick #7: Stream processing
163. Trick #8: Aspect-oriented programming
164. Trick #8: Aspect-oriented programming
165. Is this code good or bad? 72
166. Is this code good or bad? 72
167. Is this code good or bad? 72
168. Is this code good or bad? 72
169. Same code without secondary concerns 73
170. Same code without secondary concerns 73
171. Authorization control… 74
172. Authorization control… 74
173. Logging and audit… 75
174. Logging and audit… 75
175. Error handling… 76
176. Error handling… 76
179. Aspect glossary 78
180. Aspect glossary 78
181. Aspect glossary Pointcut - describes list of interesting events 78
182. Aspect glossary Pointcut - describes list of interesting events 78 Joinpoint - defines an event object
183. Aspect glossary Pointcut - describes list of interesting events Advice - event handler 78 Joinpoint - defines an event object
184. Aspect VS Event Listener 79
185. Aspect VS Event Listener 79
186. Aspect VS Event Listener 79
187. Aspect VS Event Listener 79
188. 80 All aspects (or advisors) are registered in the aspect kernel
189. 80 All aspects (or advisors) are registered in the aspect kernel
190. 81 The special php://filter stream filter is registered via stream_filter_register()
191. 82 The composer class loader is replaced with a weaving proxy
192. 83 Lexical analysis and parsing of source code into the AST is performed (nikic/PHP-Parser)
193. 84 Static reflection is created from the AST (goaop/parser-reflection)
194. 84 Static reflection is created from the AST (goaop/parser-reflection)
195. 84 Static reflection is created from the AST (goaop/parser-reflection)
196. 84 Static reflection is created from the AST (goaop/parser-reflection)
197. 85 The original class is renamed and replaced with a new class with additional behavior; stored in the cache
198. 85 The original class is renamed and replaced with a new class with additional behavior; stored in the cache
199. 85 The original class is renamed and replaced with a new class with additional behavior; stored in the cache Same class name!
200. 85 The original class is renamed and replaced with a new class with additional behavior; stored in the cache Original class renamed Same class name!
201. 85 The original class is renamed and replaced with a new class with additional behavior; stored in the cache Original class renamed Overridden method Same class name!
202. 86 What to expect in future:
203. 86 What to expect in future: Opcache preloading for AOP core
204. 86 What to expect in future: Opcache preloading for AOP core FFI integration to modify binary opcodes
205. 86 What to expect in future: Opcache preloading for AOP core FFI integration to modify binary opcodes Modifying PHP engine internal callbacks
206. 86 What to expect in future: Opcache preloading for AOP core FFI integration to modify binary opcodes Modifying PHP engine internal callbacks Some more magic?
207. Trick #8: goaop/framework 87 composer show goaop/framework --all name : goaop/framework descrip. : Framework for aspect-oriented programming in PHP. keywords : php, aop, library, aspect versions : dev-master, 3.0.x-dev, 2.x-dev, 2.3.1, … type : library license : MIT License
208. If it is too magic for you, just use PhpStorm plugin for that! 88
209. If it is too magic for you, just use PhpStorm plugin for that! 88
210. Pointcut syntax highlighting, completion and analysis 89
211. Pointcut syntax highlighting, completion and analysis 89
212. Navigate to advice/advised elements 90
213. Navigate to advice/advised elements 90
214. Текст Trick #9: Deferred methods
215. 92 Trick: prevent execution of methods wrapping them into promises and run after the fastcgi_finish_request.
216. Trick 9.1. Define an annotation 93
217. Trick 9.2. Define an aspect 94
218. Trick 9.2. Define an aspect 94
219. Trick 9.2. Define an aspect 94 All methods with «Async» annotation
220. Trick 9.2. Define an aspect 94 Record each call with arguments
221. Trick 9.2. Define an aspect 94 Prevent execution of original method
222. Trick 9.2. Define an aspect 94 Return «our» value
223. Trick 9.2. Define an aspect 95
224. Trick 9.2. Define an aspect 95
225. Trick 9.2. Define an aspect 95
226. Trick 9.2. Define an aspect 95
227. Trick 9.2. Define an aspect 95 Finish FASTCGI Request
228. Trick 9.2. Define an aspect 95 Execute delayed methods
229. Trick 9.3. Let’s use services 96
230. Trick 9.3. Let’s use services 96 Some long service call
231. Trick 9.3. Let’s use services 96
232. Trick 9.4. Declare deferred 97
233. Trick 9.4. Declare deferred 97 Now it will be deferred
234. Trick 9.4. Declare deferred 97
235. 98 The End
236. 98 The End
237. Thank you! Please, leave your feedback! 99 https://joind.in/event/php-russia-2019/school-of-php-magic---php