| 1 |
<?php |
| 2 |
/** |
| 3 |
* Class PeriodResolver |
| 4 |
* |
| 5 |
* @package LearnPress/Classes/Statistics |
| 6 |
* @since 4.4.2 |
| 7 |
*/ |
| 8 |
|
| 9 |
namespace LearnPress\Statistics; |
| 10 |
|
| 11 |
use DateTimeImmutable; |
| 12 |
use Exception; |
| 13 |
|
| 14 |
defined( 'ABSPATH' ) || exit(); |
| 15 |
|
| 16 |
/** |
| 17 |
* Single source of truth for "what window are we looking at, and at what chart |
| 18 |
* resolution". Maps a `preset` (+ optional custom `date`) to a PeriodRange, |
| 19 |
* and a PeriodRange (+ compare mode) to its delta baseline. |
| 20 |
* |
| 21 |
* - Presets resolve to concrete [ start … end ] windows carried as the legacy |
| 22 |
* `custom` pair, so every existing DB method works unchanged; the only new |
| 23 |
* signal is the explicit `granularity`. |
| 24 |
* - Weeks honor the WP `start_of_week` option; quarters are calendar quarters. |
| 25 |
* - All date math anchors on current_time() (site timezone); `$now` is |
| 26 |
* injectable for tests. |
| 27 |
* |
| 28 |
* Fail-soft contract: resolve() never throws — unknown/invalid input falls back |
| 29 |
* to `today`; previous() returns null so a KPI renders without a delta. |
| 30 |
* |
| 31 |
* @since 4.4.2 |
| 32 |
*/ |
| 33 |
class PeriodResolver { |
| 34 |
const GRAN_HOUR = 'hour'; |
| 35 |
const GRAN_DAY = 'day'; |
| 36 |
const GRAN_MONTH = 'month'; |
| 37 |
|
| 38 |
const COMPARE_PREVIOUS_PERIOD = 'previous_period'; |
| 39 |
const COMPARE_PREVIOUS_YEAR = 'previous_year'; |
| 40 |
|
| 41 |
/** |
| 42 |
* Presets offered in the date-range dropdown, in display order |
| 43 |
* ( 'custom' is the dropdown's second tab, not a list entry ). |
| 44 |
*/ |
| 45 |
const UI_PRESETS = array( 'today', 'yesterday', 'week', 'last_week', 'month', 'last_month', 'quarter', 'last_quarter', 'year', 'last_year' ); |
| 46 |
|
| 47 |
/** |
| 48 |
* Resolve a requested preset into a PeriodRange. |
| 49 |
* |
| 50 |
* @param string $preset Preset id; unknown → 'today'. |
| 51 |
* @param string $date 'Y-m-d+Y-m-d' pair, only read when $preset is 'custom'. |
| 52 |
* @param string $now 'Y-m-d H:i:s' anchor, '' → current_time( 'mysql' ) (injectable for tests). |
| 53 |
* @return PeriodRange |
| 54 |
*/ |
| 55 |
public static function resolve( string $preset, string $date = '', string $now = '' ): PeriodRange { |
| 56 |
$now_dt = self::now_dt( $now ); |
| 57 |
$preset = '' !== $preset ? $preset : 'today'; |
| 58 |
|
| 59 |
try { |
| 60 |
$range = self::build( $preset, $date, $now_dt ); |
| 61 |
} catch ( Exception $e ) { |
| 62 |
$range = null; |
| 63 |
} |
| 64 |
|
| 65 |
if ( ! $range instanceof PeriodRange ) { |
| 66 |
// Poka-yoke: unknown preset or unparsable custom date → today. |
| 67 |
$range = self::build( 'today', '', $now_dt ); |
| 68 |
} |
| 69 |
|
| 70 |
/** |
| 71 |
* Filter the resolved statistics window. |
| 72 |
* |
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* @param PeriodRange $range |
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* @param string $preset Requested preset id. |
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* @param string $date Raw custom date pair. |
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* @since 4.4.2 |
| 77 |
*/ |
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return apply_filters( 'learn-press/statistics/period-range', $range, $preset, $date ); |
| 79 |
} |
| 80 |
|
| 81 |
/** |
| 82 |
* Baseline window for KPI deltas. |
| 83 |
* |
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* previous_period shifts back by one natural unit of the preset so "to date" |
| 85 |
* stays calendar-aligned ( Jul 1–14 → Jun 1–14 ); custom/rolling windows get |
| 86 |
* the equal-length window immediately before. previous_year is the same |
| 87 |
* month/day window one calendar year earlier ( Feb 29 clamps to Feb 28 ). |
| 88 |
* |
| 89 |
* Baselines are day-granular: the legacy pair queries whole days, exactly |
| 90 |
* like the existing PeriodHelper mapping. |
| 91 |
* |
| 92 |
* @param PeriodRange $range Current window from resolve(). |
| 93 |
* @param string $compare COMPARE_PREVIOUS_PERIOD | COMPARE_PREVIOUS_YEAR. |
| 94 |
* @return PeriodRange|null Null when no baseline can be built. |
| 95 |
*/ |
| 96 |
public static function previous( PeriodRange $range, string $compare = self::COMPARE_PREVIOUS_PERIOD ): ?PeriodRange { |
| 97 |
try { |
| 98 |
$start = new DateTimeImmutable( $range->start ); |
| 99 |
$end = new DateTimeImmutable( $range->end ); |
| 100 |
|
| 101 |
if ( self::COMPARE_PREVIOUS_YEAR === self::sanitize_compare( $compare ) ) { |
| 102 |
return self::baseline( $range, self::shift_years( $start, -1 ), self::shift_years( $end, -1 ) ); |
| 103 |
} |
| 104 |
|
| 105 |
switch ( $range->preset ) { |
| 106 |
case 'today': |
| 107 |
case 'yesterday': |
| 108 |
return self::baseline( $range, $start->modify( '-1 day' ), $end->modify( '-1 day' ) ); |
| 109 |
|
| 110 |
case 'week': |
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return self::baseline( $range, $start->modify( '-7 days' ), $end->modify( '-7 days' ) ); |
| 112 |
|
| 113 |
case 'last_week': |
| 114 |
return self::baseline( $range, $start->modify( '-7 days' ), $start->modify( '-1 day' ) ); |
| 115 |
|
| 116 |
case 'month': |
| 117 |
$prev_first = $start->modify( 'first day of previous month' ); |
| 118 |
$day = min( (int) $end->format( 'j' ), (int) $prev_first->format( 't' ) ); |
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|
| 120 |
return self::baseline( $range, $prev_first, $prev_first->modify( sprintf( '+%d days', $day - 1 ) ) ); |
| 121 |
|
| 122 |
case 'last_month': |
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$prev_first = $start->modify( 'first day of previous month' ); |
| 124 |
|
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return self::baseline( $range, $prev_first, $prev_first->modify( 'last day of this month' ) ); |
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|
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case 'quarter': |
| 128 |
$prev_first = $start->modify( '-3 months' ); |
| 129 |
$prev_last = $start->modify( '-1 day' ); |
| 130 |
$elapsed = (int) $start->diff( $end )->format( '%a' ); |
| 131 |
$prev_end = $prev_first->modify( sprintf( '+%d days', $elapsed ) ); |
| 132 |
|
| 133 |
return self::baseline( $range, $prev_first, min( $prev_end, $prev_last ) ); |
| 134 |
|
| 135 |
case 'last_quarter': |
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return self::baseline( $range, $start->modify( '-3 months' ), $start->modify( '-1 day' ) ); |
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|
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case 'year': |
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return self::baseline( $range, $start->modify( '-1 year' ), self::shift_years( $end, -1 ) ); |
| 140 |
|
| 141 |
case 'last_year': |
| 142 |
$prev_first = $start->modify( '-1 year' ); |
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|
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return self::baseline( $range, $prev_first, $prev_first->modify( '+11 months' )->modify( 'last day of this month' ) ); |
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|
| 146 |
case 'custom': |
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default: |
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$length = (int) $start->diff( $end )->format( '%a' ) + 1; |
| 149 |
$prev_end = $start->modify( '-1 day' ); |
| 150 |
$prev_start = $prev_end->modify( sprintf( '-%d days', $length - 1 ) ); |
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|
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return self::baseline( $range, $prev_start, $prev_end ); |
| 153 |
} |
| 154 |
} catch ( Exception $e ) { |
| 155 |
return null; |
| 156 |
} |
| 157 |
} |
| 158 |
|
| 159 |
/** |
| 160 |
* Whitelist the compare mode; anything else → previous_period. |
| 161 |
* |
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* @param string $compare Raw request value. |
| 163 |
* @return string |
| 164 |
*/ |
| 165 |
public static function sanitize_compare( string $compare ): string { |
| 166 |
return self::COMPARE_PREVIOUS_YEAR === $compare ? self::COMPARE_PREVIOUS_YEAR : self::COMPARE_PREVIOUS_PERIOD; |
| 167 |
} |
| 168 |
|
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/** |
| 170 |
* Granularity rule for arbitrary spans ( custom ranges ): day up to 92 days, |
| 171 |
* month beyond. Presets carry their own pinned granularity instead. |
| 172 |
* |
| 173 |
* @param DateTimeImmutable $start |
| 174 |
* @param DateTimeImmutable $end |
| 175 |
* @return string |
| 176 |
*/ |
| 177 |
public static function granularity_for_span( DateTimeImmutable $start, DateTimeImmutable $end ): string { |
| 178 |
$days = (int) $start->diff( $end )->format( '%a' ) + 1; |
| 179 |
|
| 180 |
return $days <= 92 ? self::GRAN_DAY : self::GRAN_MONTH; |
| 181 |
} |
| 182 |
|
| 183 |
/** |
| 184 |
* Build the range for one preset, or null for an unknown one. |
| 185 |
* |
| 186 |
* @param string $preset |
| 187 |
* @param string $date |
| 188 |
* @param DateTimeImmutable $now |
| 189 |
* @return PeriodRange|null |
| 190 |
* @throws Exception When a custom date pair does not parse. |
| 191 |
*/ |
| 192 |
private static function build( string $preset, string $date, DateTimeImmutable $now ): ?PeriodRange { |
| 193 |
$today = $now->setTime( 0, 0, 0 ); |
| 194 |
|
| 195 |
switch ( $preset ) { |
| 196 |
case 'today': |
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return self::make( $preset, $today, $now, self::GRAN_HOUR, 'date', $now->format( 'Y-m-d' ) ); |
| 198 |
|
| 199 |
case 'yesterday': |
| 200 |
$day = $today->modify( '-1 day' ); |
| 201 |
|
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return self::make( $preset, $day, self::day_end( $day ), self::GRAN_HOUR, 'date', $day->format( 'Y-m-d' ) ); |
| 203 |
|
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case 'week': |
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return self::make_custom( $preset, self::week_start( $today ), $now, self::GRAN_DAY ); |
| 206 |
|
| 207 |
case 'last_week': |
| 208 |
$week_start = self::week_start( $today ); |
| 209 |
|
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return self::make_custom( $preset, $week_start->modify( '-7 days' ), self::day_end( $week_start->modify( '-1 day' ) ), self::GRAN_DAY ); |
| 211 |
|
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case 'month': |
| 213 |
return self::make_custom( $preset, $today->modify( 'first day of this month' ), $now, self::GRAN_DAY ); |
| 214 |
|
| 215 |
case 'last_month': |
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$first = $today->modify( 'first day of previous month' ); |
| 217 |
|
| 218 |
return self::make_custom( $preset, $first, self::day_end( $first->modify( 'last day of this month' ) ), self::GRAN_DAY ); |
| 219 |
|
| 220 |
case 'quarter': |
| 221 |
return self::make_custom( $preset, self::quarter_start( $today ), $now, self::GRAN_DAY ); |
| 222 |
|
| 223 |
case 'last_quarter': |
| 224 |
$quarter_start = self::quarter_start( $today ); |
| 225 |
|
| 226 |
return self::make_custom( $preset, $quarter_start->modify( '-3 months' ), self::day_end( $quarter_start->modify( '-1 day' ) ), self::GRAN_DAY ); |
| 227 |
|
| 228 |
case 'year': |
| 229 |
return self::make_custom( $preset, $today->modify( 'first day of january' ), $now, self::GRAN_MONTH ); |
| 230 |
|
| 231 |
case 'last_year': |
| 232 |
$jan1 = $today->modify( 'first day of january' )->modify( '-1 year' ); |
| 233 |
|
| 234 |
return self::make_custom( $preset, $jan1, self::day_end( $jan1->modify( '+11 months' )->modify( 'last day of this month' ) ), self::GRAN_MONTH ); |
| 235 |
|
| 236 |
case 'custom': |
| 237 |
$dates = explode( '+', $date ); |
| 238 |
if ( 2 !== count( $dates ) ) { |
| 239 |
return null; |
| 240 |
} |
| 241 |
sort( $dates ); |
| 242 |
$start = ( new DateTimeImmutable( $dates[0] ) )->setTime( 0, 0, 0 ); |
| 243 |
$end = self::day_end( new DateTimeImmutable( $dates[1] ) ); |
| 244 |
|
| 245 |
return self::make_custom( $preset, $start, $end, self::granularity_for_span( $start, $end ) ); |
| 246 |
} |
| 247 |
|
| 248 |
return null; |
| 249 |
} |
| 250 |
|
| 251 |
/** |
| 252 |
* @param string $preset |
| 253 |
* @param DateTimeImmutable $start |
| 254 |
* @param DateTimeImmutable $end |
| 255 |
* @param string $granularity |
| 256 |
* @param string $filter_type Legacy DB type. |
| 257 |
* @param string|int $time Legacy DB value. |
| 258 |
* @return PeriodRange |
| 259 |
*/ |
| 260 |
private static function make( string $preset, DateTimeImmutable $start, DateTimeImmutable $end, string $granularity, string $filter_type, $time ): PeriodRange { |
| 261 |
return new PeriodRange( |
| 262 |
$preset, |
| 263 |
$start->format( 'Y-m-d H:i:s' ), |
| 264 |
$end->format( 'Y-m-d H:i:s' ), |
| 265 |
$granularity, |
| 266 |
self::label_for( $preset, $start, $end, $granularity ), |
| 267 |
$filter_type, |
| 268 |
$time |
| 269 |
); |
| 270 |
} |
| 271 |
|
| 272 |
/** |
| 273 |
* Range carried as the legacy `custom` pair ( whole days, BETWEEN in SQL ). |
| 274 |
* |
| 275 |
* @param string $preset |
| 276 |
* @param DateTimeImmutable $start |
| 277 |
* @param DateTimeImmutable $end |
| 278 |
* @param string $granularity |
| 279 |
* @return PeriodRange |
| 280 |
*/ |
| 281 |
private static function make_custom( string $preset, DateTimeImmutable $start, DateTimeImmutable $end, string $granularity ): PeriodRange { |
| 282 |
return self::make( $preset, $start, $end, $granularity, 'custom', $start->format( 'Y-m-d' ) . '+' . $end->format( 'Y-m-d' ) ); |
| 283 |
} |
| 284 |
|
| 285 |
/** |
| 286 |
* Baseline PeriodRange for previous(): keeps the preset id and granularity, |
| 287 |
* carries the shifted window as date|custom legacy pair, no label. |
| 288 |
* |
| 289 |
* @param PeriodRange $range Current window. |
| 290 |
* @param DateTimeImmutable $start |
| 291 |
* @param DateTimeImmutable $end |
| 292 |
* @return PeriodRange |
| 293 |
*/ |
| 294 |
private static function baseline( PeriodRange $range, DateTimeImmutable $start, DateTimeImmutable $end ): PeriodRange { |
| 295 |
$start_day = $start->format( 'Y-m-d' ); |
| 296 |
$end_day = $end->format( 'Y-m-d' ); |
| 297 |
|
| 298 |
if ( $start_day === $end_day ) { |
| 299 |
$pair = array( 'date', $start_day ); |
| 300 |
} else { |
| 301 |
$pair = array( 'custom', $start_day . '+' . $end_day ); |
| 302 |
} |
| 303 |
|
| 304 |
return new PeriodRange( |
| 305 |
$range->preset, |
| 306 |
$start->setTime( 0, 0, 0 )->format( 'Y-m-d H:i:s' ), |
| 307 |
self::day_end( $end )->format( 'Y-m-d H:i:s' ), |
| 308 |
$range->granularity, |
| 309 |
'', |
| 310 |
$pair[0], |
| 311 |
$pair[1] |
| 312 |
); |
| 313 |
} |
| 314 |
|
| 315 |
/** |
| 316 |
* Translated display name of a preset ( "month" → "Month to date" ). |
| 317 |
* |
| 318 |
* @param string $preset Preset id. |
| 319 |
* @return string Falls back to the raw id for unknown presets. |
| 320 |
*/ |
| 321 |
public static function preset_name( string $preset ): string { |
| 322 |
$names = array( |
| 323 |
'today' => __( 'Today', 'learnpress' ), |
| 324 |
'yesterday' => __( 'Yesterday', 'learnpress' ), |
| 325 |
'week' => __( 'Week to date', 'learnpress' ), |
| 326 |
'last_week' => __( 'Last week', 'learnpress' ), |
| 327 |
'month' => __( 'Month to date', 'learnpress' ), |
| 328 |
'last_month' => __( 'Last month', 'learnpress' ), |
| 329 |
'quarter' => __( 'Quarter to date', 'learnpress' ), |
| 330 |
'last_quarter' => __( 'Last quarter', 'learnpress' ), |
| 331 |
'year' => __( 'Year to date', 'learnpress' ), |
| 332 |
'last_year' => __( 'Last year', 'learnpress' ), |
| 333 |
'custom' => __( 'Custom', 'learnpress' ), |
| 334 |
); |
| 335 |
|
| 336 |
return $names[ $preset ] ?? $preset; |
| 337 |
} |
| 338 |
|
| 339 |
/** |
| 340 |
* Human range part of a resolved window ( "Jul 1 – 14" ) — what the |
| 341 |
* dropdown toggle shows next to the preset name. |
| 342 |
* |
| 343 |
* @param PeriodRange $range |
| 344 |
* @return string |
| 345 |
*/ |
| 346 |
public static function range_label_for( PeriodRange $range ): string { |
| 347 |
try { |
| 348 |
return self::range_label( |
| 349 |
new DateTimeImmutable( $range->start ), |
| 350 |
new DateTimeImmutable( $range->end ), |
| 351 |
$range->granularity |
| 352 |
); |
| 353 |
} catch ( Exception $e ) { |
| 354 |
return ''; |
| 355 |
} |
| 356 |
} |
| 357 |
|
| 358 |
/** |
| 359 |
* Preset name + resolved range, e.g. "Month to date (Jul 1 – 14)". |
| 360 |
* |
| 361 |
* @param string $preset |
| 362 |
* @param DateTimeImmutable $start |
| 363 |
* @param DateTimeImmutable $end |
| 364 |
* @param string $granularity |
| 365 |
* @return string |
| 366 |
*/ |
| 367 |
private static function label_for( string $preset, DateTimeImmutable $start, DateTimeImmutable $end, string $granularity ): string { |
| 368 |
return sprintf( '%s (%s)', self::preset_name( $preset ), self::range_label( $start, $end, $granularity ) ); |
| 369 |
} |
| 370 |
|
| 371 |
/** |
| 372 |
* Human range part of the label, densest unambiguous form. |
| 373 |
* |
| 374 |
* @param DateTimeImmutable $start |
| 375 |
* @param DateTimeImmutable $end |
| 376 |
* @param string $granularity |
| 377 |
* @return string |
| 378 |
*/ |
| 379 |
private static function range_label( DateTimeImmutable $start, DateTimeImmutable $end, string $granularity ): string { |
| 380 |
$same_year = $start->format( 'Y' ) === $end->format( 'Y' ); |
| 381 |
$same_month = $same_year && $start->format( 'm' ) === $end->format( 'm' ); |
| 382 |
|
| 383 |
if ( self::GRAN_MONTH === $granularity ) { |
| 384 |
// Exact calendar year → just the year ( "2025" ). |
| 385 |
if ( $same_year && '01-01' === $start->format( 'm-d' ) && '12-31' === $end->format( 'm-d' ) ) { |
| 386 |
return date_i18n( 'Y', $start->getTimestamp() ); |
| 387 |
} |
| 388 |
if ( $same_month ) { |
| 389 |
return date_i18n( 'M Y', $start->getTimestamp() ); |
| 390 |
} |
| 391 |
if ( $same_year ) { |
| 392 |
return date_i18n( 'M', $start->getTimestamp() ) . ' – ' . date_i18n( 'M', $end->getTimestamp() ); |
| 393 |
} |
| 394 |
|
| 395 |
return date_i18n( 'M Y', $start->getTimestamp() ) . ' – ' . date_i18n( 'M Y', $end->getTimestamp() ); |
| 396 |
} |
| 397 |
|
| 398 |
if ( $start->format( 'Y-m-d' ) === $end->format( 'Y-m-d' ) ) { |
| 399 |
return date_i18n( 'M j', $start->getTimestamp() ); |
| 400 |
} |
| 401 |
if ( $same_month ) { |
| 402 |
return date_i18n( 'M j', $start->getTimestamp() ) . ' – ' . date_i18n( 'j', $end->getTimestamp() ); |
| 403 |
} |
| 404 |
if ( $same_year ) { |
| 405 |
return date_i18n( 'M j', $start->getTimestamp() ) . ' – ' . date_i18n( 'M j', $end->getTimestamp() ); |
| 406 |
} |
| 407 |
|
| 408 |
return date_i18n( 'M j, Y', $start->getTimestamp() ) . ' – ' . date_i18n( 'M j, Y', $end->getTimestamp() ); |
| 409 |
} |
| 410 |
|
| 411 |
/** |
| 412 |
* First day of the week containing $day, honoring WP start_of_week |
| 413 |
* ( 0 = Sunday … 6 = Saturday ). |
| 414 |
* |
| 415 |
* @param DateTimeImmutable $day |
| 416 |
* @return DateTimeImmutable |
| 417 |
*/ |
| 418 |
private static function week_start( DateTimeImmutable $day ): DateTimeImmutable { |
| 419 |
$start_of_week = (int) get_option( 'start_of_week', 1 ); |
| 420 |
$offset = ( (int) $day->format( 'w' ) - $start_of_week + 7 ) % 7; |
| 421 |
|
| 422 |
return $day->modify( sprintf( '-%d days', $offset ) ); |
| 423 |
} |
| 424 |
|
| 425 |
/** |
| 426 |
* First day of the calendar quarter containing $day. |
| 427 |
* |
| 428 |
* @param DateTimeImmutable $day |
| 429 |
* @return DateTimeImmutable |
| 430 |
*/ |
| 431 |
private static function quarter_start( DateTimeImmutable $day ): DateTimeImmutable { |
| 432 |
$quarter_month = (int) floor( ( (int) $day->format( 'n' ) - 1 ) / 3 ) * 3 + 1; |
| 433 |
|
| 434 |
return $day->setDate( (int) $day->format( 'Y' ), $quarter_month, 1 ); |
| 435 |
} |
| 436 |
|
| 437 |
/** |
| 438 |
* Shift a date by whole years, clamping Feb 29 → Feb 28 instead of letting |
| 439 |
* PHP overflow into March. |
| 440 |
* |
| 441 |
* @param DateTimeImmutable $date |
| 442 |
* @param int $years Signed. |
| 443 |
* @return DateTimeImmutable |
| 444 |
*/ |
| 445 |
private static function shift_years( DateTimeImmutable $date, int $years ): DateTimeImmutable { |
| 446 |
$year = (int) $date->format( 'Y' ) + $years; |
| 447 |
$month = (int) $date->format( 'n' ); |
| 448 |
$day = (int) $date->format( 'j' ); |
| 449 |
|
| 450 |
if ( ! checkdate( $month, $day, $year ) ) { |
| 451 |
$day = (int) $date->setDate( $year, $month, 1 )->format( 't' ); |
| 452 |
} |
| 453 |
|
| 454 |
return $date->setDate( $year, $month, $day ); |
| 455 |
} |
| 456 |
|
| 457 |
/** |
| 458 |
* @param DateTimeImmutable $day |
| 459 |
* @return DateTimeImmutable |
| 460 |
*/ |
| 461 |
private static function day_end( DateTimeImmutable $day ): DateTimeImmutable { |
| 462 |
return $day->setTime( 23, 59, 59 ); |
| 463 |
} |
| 464 |
|
| 465 |
/** |
| 466 |
* @param string $now Injected 'Y-m-d H:i:s' or '' for WP current time. |
| 467 |
* @return DateTimeImmutable |
| 468 |
* @throws Exception Never in practice — falls back to server now. |
| 469 |
*/ |
| 470 |
private static function now_dt( string $now ): DateTimeImmutable { |
| 471 |
if ( '' === $now ) { |
| 472 |
$now = (string) current_time( 'mysql' ); |
| 473 |
} |
| 474 |
|
| 475 |
return new DateTimeImmutable( $now ); |
| 476 |
} |
| 477 |
} |
| 478 |
|
