Conditions | 1 |
Paths | 1 |
Total Lines | 712 |
Code Lines | 389 |
Lines | 0 |
Ratio | 0 % |
Changes | 0 |
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
1 | <?php |
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88 | public function processProvider() |
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89 | { |
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90 | yield 'Ascending forward start inclusive' => [ |
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91 | [ |
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92 | 'forward' => true, |
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93 | 'seekable' => true, |
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94 | 'limit' => 3, |
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95 | 'order' => [ |
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96 | 'Post.modified' => 'ASC', |
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97 | 'Post.id' => 'ASC', |
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98 | ], |
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99 | ], |
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100 | [ |
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101 | 'records' => [ |
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102 | [ |
||
103 | 'Post' => [ |
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104 | 'id' => '1', |
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105 | 'modified' => '2017-01-01 10:00:00', |
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106 | ], |
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107 | ], |
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108 | [ |
||
109 | 'Post' => [ |
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110 | 'id' => '3', |
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111 | 'modified' => '2017-01-01 10:00:00', |
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112 | ], |
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113 | ], |
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114 | [ |
||
115 | 'Post' => [ |
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116 | 'id' => '5', |
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117 | 'modified' => '2017-01-01 10:00:00', |
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118 | ], |
||
119 | ], |
||
120 | ], |
||
121 | 'meta' => [ |
||
122 | 'next_cursor' => [ |
||
123 | 'Post' => [ |
||
124 | 'id' => '2', |
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125 | 'modified' => '2017-01-01 11:00:00', |
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126 | ], |
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127 | ], |
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128 | ], |
||
129 | ], |
||
130 | ]; |
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131 | |||
132 | yield 'Ascending forward start exclusive' => [ |
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133 | [ |
||
134 | 'forward' => true, |
||
135 | 'seekable' => true, |
||
136 | 'exclusive' => true, |
||
137 | 'limit' => 3, |
||
138 | 'order' => [ |
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139 | 'Post.modified' => 'ASC', |
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140 | 'Post.id' => 'ASC', |
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141 | ], |
||
142 | ], |
||
143 | [ |
||
144 | 'records' => [ |
||
145 | [ |
||
146 | 'Post' => [ |
||
147 | 'id' => '1', |
||
148 | 'modified' => '2017-01-01 10:00:00', |
||
149 | ], |
||
150 | ], |
||
151 | [ |
||
152 | 'Post' => [ |
||
153 | 'id' => '3', |
||
154 | 'modified' => '2017-01-01 10:00:00', |
||
155 | ], |
||
156 | ], |
||
157 | [ |
||
158 | 'Post' => [ |
||
159 | 'id' => '5', |
||
160 | 'modified' => '2017-01-01 10:00:00', |
||
161 | ], |
||
162 | ], |
||
163 | ], |
||
164 | 'meta' => [ |
||
165 | 'next_cursor' => [ |
||
166 | 'Post' => [ |
||
167 | 'id' => '5', |
||
168 | 'modified' => '2017-01-01 10:00:00', |
||
169 | ], |
||
170 | ], |
||
171 | ], |
||
172 | ], |
||
173 | ]; |
||
174 | |||
175 | yield 'Ascending forward inclusive' => [ |
||
176 | [ |
||
177 | 'forward' => true, |
||
178 | 'seekable' => true, |
||
179 | 'limit' => 3, |
||
180 | 'cursor' => [ |
||
181 | 'Post' => [ |
||
182 | 'id' => '3', |
||
183 | 'modified' => '2017-01-01 10:00:00', |
||
184 | ], |
||
185 | ], |
||
186 | 'order' => [ |
||
187 | 'Post.modified' => 'ASC', |
||
188 | 'Post.id' => 'ASC', |
||
189 | ], |
||
190 | ], |
||
191 | [ |
||
192 | 'records' => [ |
||
193 | [ |
||
194 | 'Post' => [ |
||
195 | 'id' => '3', |
||
196 | 'modified' => '2017-01-01 10:00:00', |
||
197 | ], |
||
198 | ], |
||
199 | [ |
||
200 | 'Post' => [ |
||
201 | 'id' => '5', |
||
202 | 'modified' => '2017-01-01 10:00:00', |
||
203 | ], |
||
204 | ], |
||
205 | [ |
||
206 | 'Post' => [ |
||
207 | 'id' => '2', |
||
208 | 'modified' => '2017-01-01 11:00:00', |
||
209 | ], |
||
210 | ], |
||
211 | ], |
||
212 | 'meta' => [ |
||
213 | 'previous_cursor' => [ |
||
214 | 'Post' => [ |
||
215 | 'id' => '1', |
||
216 | 'modified' => '2017-01-01 10:00:00', |
||
217 | ], |
||
218 | ], |
||
219 | 'next_cursor' => [ |
||
220 | 'Post' => [ |
||
221 | 'id' => '4', |
||
222 | 'modified' => '2017-01-01 11:00:00', |
||
223 | ], |
||
224 | ], |
||
225 | ], |
||
226 | ], |
||
227 | ]; |
||
228 | |||
229 | yield 'Ascending forward exclusive' => [ |
||
230 | [ |
||
231 | 'forward' => true, |
||
232 | 'seekable' => true, |
||
233 | 'exclusive' => true, |
||
234 | 'limit' => 3, |
||
235 | 'cursor' => [ |
||
236 | 'Post' => [ |
||
237 | 'id' => '3', |
||
238 | 'modified' => '2017-01-01 10:00:00', |
||
239 | ], |
||
240 | ], |
||
241 | 'order' => [ |
||
242 | 'Post.modified' => 'ASC', |
||
243 | 'Post.id' => 'ASC', |
||
244 | ], |
||
245 | ], |
||
246 | [ |
||
247 | 'records' => [ |
||
248 | [ |
||
249 | 'Post' => [ |
||
250 | 'id' => '5', |
||
251 | 'modified' => '2017-01-01 10:00:00', |
||
252 | ], |
||
253 | ], |
||
254 | [ |
||
255 | 'Post' => [ |
||
256 | 'id' => '2', |
||
257 | 'modified' => '2017-01-01 11:00:00', |
||
258 | ], |
||
259 | ], |
||
260 | [ |
||
261 | 'Post' => [ |
||
262 | 'id' => '4', |
||
263 | 'modified' => '2017-01-01 11:00:00', |
||
264 | ], |
||
265 | ], |
||
266 | ], |
||
267 | 'meta' => [ |
||
268 | 'previous_cursor' => [ |
||
269 | 'Post' => [ |
||
270 | 'id' => '5', |
||
271 | 'modified' => '2017-01-01 10:00:00', |
||
272 | ], |
||
273 | ], |
||
274 | 'next_cursor' => null, |
||
275 | ], |
||
276 | ], |
||
277 | ]; |
||
278 | |||
279 | yield 'Ascending backward start inclusive' => [ |
||
280 | [ |
||
281 | 'backward' => true, |
||
282 | 'seekable' => true, |
||
283 | 'limit' => 3, |
||
284 | 'order' => [ |
||
285 | 'Post.modified' => 'ASC', |
||
286 | 'Post.id' => 'ASC', |
||
287 | ], |
||
288 | ], |
||
289 | [ |
||
290 | 'records' => [ |
||
291 | [ |
||
292 | 'Post' => [ |
||
293 | 'id' => '5', |
||
294 | 'modified' => '2017-01-01 10:00:00', |
||
295 | ], |
||
296 | ], |
||
297 | [ |
||
298 | 'Post' => [ |
||
299 | 'id' => '2', |
||
300 | 'modified' => '2017-01-01 11:00:00', |
||
301 | ], |
||
302 | ], |
||
303 | [ |
||
304 | 'Post' => [ |
||
305 | 'id' => '4', |
||
306 | 'modified' => '2017-01-01 11:00:00', |
||
307 | ], |
||
308 | ], |
||
309 | ], |
||
310 | 'meta' => [ |
||
311 | 'previous_cursor' => [ |
||
312 | 'Post' => [ |
||
313 | 'id' => '3', |
||
314 | 'modified' => '2017-01-01 10:00:00', |
||
315 | ], |
||
316 | ], |
||
317 | ], |
||
318 | ], |
||
319 | ]; |
||
320 | |||
321 | yield 'Ascending backward start exclusive' => [ |
||
322 | [ |
||
323 | 'backward' => true, |
||
324 | 'seekable' => true, |
||
325 | 'exclusive' => true, |
||
326 | 'limit' => 3, |
||
327 | 'order' => [ |
||
328 | 'Post.modified' => 'ASC', |
||
329 | 'Post.id' => 'ASC', |
||
330 | ], |
||
331 | ], |
||
332 | [ |
||
333 | 'records' => [ |
||
334 | [ |
||
335 | 'Post' => [ |
||
336 | 'id' => '5', |
||
337 | 'modified' => '2017-01-01 10:00:00', |
||
338 | ], |
||
339 | ], |
||
340 | [ |
||
341 | 'Post' => [ |
||
342 | 'id' => '2', |
||
343 | 'modified' => '2017-01-01 11:00:00', |
||
344 | ], |
||
345 | ], |
||
346 | [ |
||
347 | 'Post' => [ |
||
348 | 'id' => '4', |
||
349 | 'modified' => '2017-01-01 11:00:00', |
||
350 | ], |
||
351 | ], |
||
352 | ], |
||
353 | 'meta' => [ |
||
354 | 'previous_cursor' => [ |
||
355 | 'Post' => [ |
||
356 | 'id' => '5', |
||
357 | 'modified' => '2017-01-01 10:00:00', |
||
358 | ], |
||
359 | ], |
||
360 | ], |
||
361 | ], |
||
362 | ]; |
||
363 | |||
364 | yield 'Ascending backward inclusive' => [ |
||
365 | [ |
||
366 | 'backward' => true, |
||
367 | 'seekable' => true, |
||
368 | 'limit' => 3, |
||
369 | 'cursor' => [ |
||
370 | 'Post' => [ |
||
371 | 'id' => '3', |
||
372 | 'modified' => '2017-01-01 10:00:00', |
||
373 | ], |
||
374 | ], |
||
375 | 'order' => [ |
||
376 | 'Post.modified' => 'ASC', |
||
377 | 'Post.id' => 'ASC', |
||
378 | ], |
||
379 | ], |
||
380 | [ |
||
381 | 'records' => [ |
||
382 | [ |
||
383 | 'Post' => [ |
||
384 | 'id' => '1', |
||
385 | 'modified' => '2017-01-01 10:00:00', |
||
386 | ], |
||
387 | ], |
||
388 | [ |
||
389 | 'Post' => [ |
||
390 | 'id' => '3', |
||
391 | 'modified' => '2017-01-01 10:00:00', |
||
392 | ], |
||
393 | ], |
||
394 | ], |
||
395 | 'meta' => [ |
||
396 | 'previous_cursor' => null, |
||
397 | 'next_cursor' => [ |
||
398 | 'Post' => [ |
||
399 | 'id' => '5', |
||
400 | 'modified' => '2017-01-01 10:00:00', |
||
401 | ], |
||
402 | ], |
||
403 | ], |
||
404 | ], |
||
405 | ]; |
||
406 | |||
407 | yield 'Ascending backward exclusive' => [ |
||
408 | [ |
||
409 | 'backward' => true, |
||
410 | 'seekable' => true, |
||
411 | 'exclusive' => true, |
||
412 | 'limit' => 3, |
||
413 | 'cursor' => [ |
||
414 | 'Post' => [ |
||
415 | 'id' => '3', |
||
416 | 'modified' => '2017-01-01 10:00:00', |
||
417 | ], |
||
418 | ], |
||
419 | 'order' => [ |
||
420 | 'Post.modified' => 'ASC', |
||
421 | 'Post.id' => 'ASC', |
||
422 | ], |
||
423 | ], |
||
424 | [ |
||
425 | 'records' => [ |
||
426 | [ |
||
427 | 'Post' => [ |
||
428 | 'id' => '1', |
||
429 | 'modified' => '2017-01-01 10:00:00', |
||
430 | ], |
||
431 | ], |
||
432 | ], |
||
433 | 'meta' => [ |
||
434 | 'previous_cursor' => null, |
||
435 | 'next_cursor' => [ |
||
436 | 'Post' => [ |
||
437 | 'id' => '1', |
||
438 | 'modified' => '2017-01-01 10:00:00', |
||
439 | ], |
||
440 | ], |
||
441 | ], |
||
442 | ], |
||
443 | ]; |
||
444 | |||
445 | yield 'Descending forward start inclusive' => [ |
||
446 | [ |
||
447 | 'forward' => true, |
||
448 | 'seekable' => true, |
||
449 | 'limit' => 3, |
||
450 | 'order' => [ |
||
451 | 'Post.modified' => 'DESC', |
||
452 | 'Post.id' => 'DESC', |
||
453 | ], |
||
454 | ], |
||
455 | [ |
||
456 | 'records' => [ |
||
457 | [ |
||
458 | 'Post' => [ |
||
459 | 'id' => '4', |
||
460 | 'modified' => '2017-01-01 11:00:00', |
||
461 | ], |
||
462 | ], |
||
463 | [ |
||
464 | 'Post' => [ |
||
465 | 'id' => '2', |
||
466 | 'modified' => '2017-01-01 11:00:00', |
||
467 | ], |
||
468 | ], |
||
469 | [ |
||
470 | 'Post' => [ |
||
471 | 'id' => '5', |
||
472 | 'modified' => '2017-01-01 10:00:00', |
||
473 | ], |
||
474 | ], |
||
475 | ], |
||
476 | 'meta' => [ |
||
477 | 'next_cursor' => [ |
||
478 | 'Post' => [ |
||
479 | 'id' => '3', |
||
480 | 'modified' => '2017-01-01 10:00:00', |
||
481 | ], |
||
482 | ], |
||
483 | ], |
||
484 | ], |
||
485 | ]; |
||
486 | |||
487 | yield 'Descending forward start exclusive' => [ |
||
488 | [ |
||
489 | 'forward' => true, |
||
490 | 'seekable' => true, |
||
491 | 'exclusive' => true, |
||
492 | 'limit' => 3, |
||
493 | 'order' => [ |
||
494 | 'Post.modified' => 'DESC', |
||
495 | 'Post.id' => 'DESC', |
||
496 | ], |
||
497 | ], |
||
498 | [ |
||
499 | 'records' => [ |
||
500 | [ |
||
501 | 'Post' => [ |
||
502 | 'id' => '4', |
||
503 | 'modified' => '2017-01-01 11:00:00', |
||
504 | ], |
||
505 | ], |
||
506 | [ |
||
507 | 'Post' => [ |
||
508 | 'id' => '2', |
||
509 | 'modified' => '2017-01-01 11:00:00', |
||
510 | ], |
||
511 | ], |
||
512 | [ |
||
513 | 'Post' => [ |
||
514 | 'id' => '5', |
||
515 | 'modified' => '2017-01-01 10:00:00', |
||
516 | ], |
||
517 | ], |
||
518 | ], |
||
519 | 'meta' => [ |
||
520 | 'next_cursor' => [ |
||
521 | 'Post' => [ |
||
522 | 'id' => '5', |
||
523 | 'modified' => '2017-01-01 10:00:00', |
||
524 | ], |
||
525 | ], |
||
526 | ], |
||
527 | ], |
||
528 | ]; |
||
529 | |||
530 | yield 'Descending forward inclusive' => [ |
||
531 | [ |
||
532 | 'forward' => true, |
||
533 | 'seekable' => true, |
||
534 | 'limit' => 3, |
||
535 | 'cursor' => [ |
||
536 | 'Post' => [ |
||
537 | 'id' => '3', |
||
538 | 'modified' => '2017-01-01 10:00:00', |
||
539 | ], |
||
540 | ], |
||
541 | 'order' => [ |
||
542 | 'Post.modified' => 'DESC', |
||
543 | 'Post.id' => 'DESC', |
||
544 | ], |
||
545 | ], |
||
546 | [ |
||
547 | 'records' => [ |
||
548 | [ |
||
549 | 'Post' => [ |
||
550 | 'id' => '3', |
||
551 | 'modified' => '2017-01-01 10:00:00', |
||
552 | ], |
||
553 | ], |
||
554 | [ |
||
555 | 'Post' => [ |
||
556 | 'id' => '1', |
||
557 | 'modified' => '2017-01-01 10:00:00', |
||
558 | ], |
||
559 | ], |
||
560 | ], |
||
561 | 'meta' => [ |
||
562 | 'previous_cursor' => [ |
||
563 | 'Post' => [ |
||
564 | 'id' => '5', |
||
565 | 'modified' => '2017-01-01 10:00:00', |
||
566 | ], |
||
567 | ], |
||
568 | 'next_cursor' => null, |
||
569 | ], |
||
570 | ], |
||
571 | ]; |
||
572 | |||
573 | yield 'Descending forward exclusive' => [ |
||
574 | [ |
||
575 | 'forward' => true, |
||
576 | 'seekable' => true, |
||
577 | 'exclusive' => true, |
||
578 | 'limit' => 3, |
||
579 | 'cursor' => [ |
||
580 | 'Post' => [ |
||
581 | 'id' => '3', |
||
582 | 'modified' => '2017-01-01 10:00:00', |
||
583 | ], |
||
584 | ], |
||
585 | 'order' => [ |
||
586 | 'Post.modified' => 'DESC', |
||
587 | 'Post.id' => 'DESC', |
||
588 | ], |
||
589 | ], |
||
590 | [ |
||
591 | 'records' => [ |
||
592 | [ |
||
593 | 'Post' => [ |
||
594 | 'id' => '1', |
||
595 | 'modified' => '2017-01-01 10:00:00', |
||
596 | ], |
||
597 | ], |
||
598 | ], |
||
599 | 'meta' => [ |
||
600 | 'previous_cursor' => [ |
||
601 | 'Post' => [ |
||
602 | 'id' => '1', |
||
603 | 'modified' => '2017-01-01 10:00:00', |
||
604 | ], |
||
605 | ], |
||
606 | 'next_cursor' => null, |
||
607 | ], |
||
608 | ], |
||
609 | ]; |
||
610 | |||
611 | yield 'Descending backward start inclusive' => [ |
||
612 | [ |
||
613 | 'backward' => true, |
||
614 | 'seekable' => true, |
||
615 | 'limit' => 3, |
||
616 | 'order' => [ |
||
617 | 'Post.modified' => 'DESC', |
||
618 | 'Post.id' => 'DESC', |
||
619 | ], |
||
620 | ], |
||
621 | [ |
||
622 | 'records' => [ |
||
623 | [ |
||
624 | 'Post' => [ |
||
625 | 'id' => '5', |
||
626 | 'modified' => '2017-01-01 10:00:00', |
||
627 | ], |
||
628 | ], |
||
629 | [ |
||
630 | 'Post' => [ |
||
631 | 'id' => '3', |
||
632 | 'modified' => '2017-01-01 10:00:00', |
||
633 | ], |
||
634 | ], |
||
635 | [ |
||
636 | 'Post' => [ |
||
637 | 'id' => '1', |
||
638 | 'modified' => '2017-01-01 10:00:00', |
||
639 | ], |
||
640 | ], |
||
641 | ], |
||
642 | 'meta' => [ |
||
643 | 'previous_cursor' => [ |
||
644 | 'Post' => [ |
||
645 | 'id' => '2', |
||
646 | 'modified' => '2017-01-01 11:00:00', |
||
647 | ], |
||
648 | ], |
||
649 | ], |
||
650 | ], |
||
651 | ]; |
||
652 | |||
653 | yield 'Descending backward start exclusive' => [ |
||
654 | [ |
||
655 | 'backward' => true, |
||
656 | 'seekable' => true, |
||
657 | 'exclusive' => true, |
||
658 | 'limit' => 3, |
||
659 | 'order' => [ |
||
660 | 'Post.modified' => 'DESC', |
||
661 | 'Post.id' => 'DESC', |
||
662 | ], |
||
663 | ], |
||
664 | [ |
||
665 | 'records' => [ |
||
666 | [ |
||
667 | 'Post' => [ |
||
668 | 'id' => '5', |
||
669 | 'modified' => '2017-01-01 10:00:00', |
||
670 | ], |
||
671 | ], |
||
672 | [ |
||
673 | 'Post' => [ |
||
674 | 'id' => '3', |
||
675 | 'modified' => '2017-01-01 10:00:00', |
||
676 | ], |
||
677 | ], |
||
678 | [ |
||
679 | 'Post' => [ |
||
680 | 'id' => '1', |
||
681 | 'modified' => '2017-01-01 10:00:00', |
||
682 | ], |
||
683 | ], |
||
684 | ], |
||
685 | 'meta' => [ |
||
686 | 'previous_cursor' => [ |
||
687 | 'Post' => [ |
||
688 | 'id' => '5', |
||
689 | 'modified' => '2017-01-01 10:00:00', |
||
690 | ], |
||
691 | ], |
||
692 | ], |
||
693 | ], |
||
694 | ]; |
||
695 | |||
696 | yield 'Descending backward inclusive' => [ |
||
697 | [ |
||
698 | 'backward' => true, |
||
699 | 'seekable' => true, |
||
700 | 'limit' => 3, |
||
701 | 'cursor' => [ |
||
702 | 'Post' => [ |
||
703 | 'id' => '3', |
||
704 | 'modified' => '2017-01-01 10:00:00', |
||
705 | ], |
||
706 | ], |
||
707 | 'order' => [ |
||
708 | 'Post.modified' => 'desc', |
||
709 | 'Post.id' => 'desc', |
||
710 | ], |
||
711 | ], |
||
712 | [ |
||
713 | 'records' => [ |
||
714 | [ |
||
715 | 'Post' => [ |
||
716 | 'id' => '2', |
||
717 | 'modified' => '2017-01-01 11:00:00', |
||
718 | ], |
||
719 | ], |
||
720 | [ |
||
721 | 'Post' => [ |
||
722 | 'id' => '5', |
||
723 | 'modified' => '2017-01-01 10:00:00', |
||
724 | ], |
||
725 | ], |
||
726 | [ |
||
727 | 'Post' => [ |
||
728 | 'id' => '3', |
||
729 | 'modified' => '2017-01-01 10:00:00', |
||
730 | ], |
||
731 | ], |
||
732 | ], |
||
733 | 'meta' => [ |
||
734 | 'previous_cursor' => [ |
||
735 | 'Post' => [ |
||
736 | 'id' => '4', |
||
737 | 'modified' => '2017-01-01 11:00:00', |
||
738 | ], |
||
739 | ], |
||
740 | 'next_cursor' => [ |
||
741 | 'Post' => [ |
||
742 | 'id' => '1', |
||
743 | 'modified' => '2017-01-01 10:00:00', |
||
744 | ], |
||
745 | ], |
||
746 | ], |
||
747 | ], |
||
748 | ]; |
||
749 | |||
750 | yield 'Descending backward exlusive' => [ |
||
751 | [ |
||
752 | 'backward' => true, |
||
753 | 'seekable' => true, |
||
754 | 'exclusive' => true, |
||
755 | 'limit' => 3, |
||
756 | 'cursor' => [ |
||
757 | 'Post' => [ |
||
758 | 'id' => '3', |
||
759 | 'modified' => '2017-01-01 10:00:00', |
||
760 | ], |
||
761 | ], |
||
762 | 'order' => [ |
||
763 | 'Post.modified' => 'desc', |
||
764 | 'Post.id' => 'desc', |
||
765 | ], |
||
766 | ], |
||
767 | [ |
||
768 | 'records' => [ |
||
769 | [ |
||
770 | 'Post' => [ |
||
771 | 'id' => '4', |
||
772 | 'modified' => '2017-01-01 11:00:00', |
||
773 | ], |
||
774 | ], |
||
775 | [ |
||
776 | 'Post' => [ |
||
777 | 'id' => '2', |
||
778 | 'modified' => '2017-01-01 11:00:00', |
||
779 | ], |
||
780 | ], |
||
781 | [ |
||
782 | 'Post' => [ |
||
783 | 'id' => '5', |
||
784 | 'modified' => '2017-01-01 10:00:00', |
||
785 | ], |
||
786 | ], |
||
787 | ], |
||
788 | 'meta' => [ |
||
789 | 'previous_cursor' => null, |
||
790 | 'next_cursor' => [ |
||
791 | 'Post' => [ |
||
792 | 'id' => '5', |
||
793 | 'modified' => '2017-01-01 10:00:00', |
||
794 | ], |
||
795 | ], |
||
796 | ], |
||
797 | ], |
||
798 | ]; |
||
799 | } |
||
800 | } |
||
801 |
The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.