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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Utilities - Functions and Classes common to the whole phpMyFAQ architecture. |
| 5 | * |
| 6 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 7 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 8 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 9 | * |
| 10 | * @package phpMyFAQ |
| 11 | * @author Thorsten Rinne <thorsten@phpmyfaq.de> |
| 12 | * @author Matteo Scaramuccia <matteo@phpmyfaq.de> |
| 13 | * @copyright 2005-2026 phpMyFAQ Team |
| 14 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 15 | * @link https://www.phpmyfaq.de |
| 16 | * @since 2005-11-01 |
| 17 | */ |
| 18 | |
| 19 | declare(strict_types=1); |
| 20 | |
| 21 | namespace phpMyFAQ; |
| 22 | |
| 23 | /** |
| 24 | * Class Utils |
| 25 | * |
| 26 | * @package phpMyFAQ |
| 27 | */ |
| 28 | class Utils |
| 29 | { |
| 30 | /** |
| 31 | * Check if a given string could be a language. |
| 32 | * |
| 33 | * @param string $language Language |
| 34 | */ |
| 35 | public static function isLanguage(string $language): bool |
| 36 | { |
| 37 | return (bool) preg_match(pattern: '/^[a-zA-Z\-]+$/', subject: $language); |
| 38 | } |
| 39 | |
| 40 | /** |
| 41 | * Checks if a date is a phpMyFAQ valid date. |
| 42 | * |
| 43 | * @param string $date Date |
| 44 | */ |
| 45 | public static function isLikeOnPMFDate(string $date): bool |
| 46 | { |
| 47 | // Test if the passed string is in the format: %YYYYMMDDhhmmss% |
| 48 | $dateToTest = $date; |
| 49 | // Suppress first occurrences of '%' |
| 50 | if (str_starts_with($dateToTest, '%')) { |
| 51 | $dateToTest = substr($dateToTest, offset: 1); |
| 52 | } |
| 53 | |
| 54 | // Suppress last occurrences of '%' |
| 55 | if (str_ends_with($dateToTest, needle: '%')) { |
| 56 | $dateToTest = substr(string: $dateToTest, offset: 0, length: strlen($dateToTest) - 1); |
| 57 | } |
| 58 | |
| 59 | // PMF date consists of numbers only: YYYYMMDDhhmmss |
| 60 | return is_numeric($dateToTest); |
| 61 | } |
| 62 | |
| 63 | /** |
| 64 | * Shortens a string for a given number of words. |
| 65 | * |
| 66 | * @param string $string String |
| 67 | * @param int $characters Characters |
| 68 | * @todo This function doesn't work with Chinese, Japanese, Korean and Thai because they don't have spaces as word |
| 69 | * delimiters |
| 70 | */ |
| 71 | public static function makeShorterText(string $string, int $characters): string |
| 72 | { |
| 73 | $condensed = Strings::preg_replace(pattern: '/\s+/u', replacement: ' ', subject: $string); |
| 74 | $string = is_string($condensed) ? $condensed : $string; |
| 75 | $arrStr = explode(separator: ' ', string: $string); |
| 76 | |
| 77 | if (count($arrStr) > $characters) { |
| 78 | return implode(separator: ' ', array: array_slice(array: $arrStr, offset: 0, length: $characters)) . ' ...'; |
| 79 | } |
| 80 | |
| 81 | return $string; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Resolves the phpMyFAQ markers like e.g. %sitename%. |
| 86 | * |
| 87 | * @param string $text Text contains phpMyFAQ markers |
| 88 | */ |
| 89 | public static function resolveMarkers(string $text, Configuration $configuration): string |
| 90 | { |
| 91 | // Available markers: key and resolving value |
| 92 | $markers = [ |
| 93 | '%sitename%' => $configuration->getTitle(), |
| 94 | ]; |
| 95 | |
| 96 | // Resolve any known pattern |
| 97 | return str_replace(array_keys($markers), array_values($markers), $text); |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * This method chops a string. |
| 102 | * |
| 103 | * @param string $string String to chop |
| 104 | * @param int $words Number of words |
| 105 | */ |
| 106 | public static function chopString(string $string, int $words): string |
| 107 | { |
| 108 | $str = ''; |
| 109 | $pieces = explode(separator: ' ', string: $string); |
| 110 | $num = count($pieces); |
| 111 | if ($words > $num) { |
| 112 | $words = $num; |
| 113 | } |
| 114 | |
| 115 | for ($i = 0; $i < $words; ++$i) { |
| 116 | $str .= $pieces[$i] . ' '; |
| 117 | } |
| 118 | |
| 119 | return $str; |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Adds a highlighted word to a string. |
| 124 | * |
| 125 | * @param string $string String |
| 126 | * @param string $highlight Given word for highlighting |
| 127 | */ |
| 128 | public static function setHighlightedString(string $string, string $highlight): string |
| 129 | { |
| 130 | $attributes = [ |
| 131 | 'href', |
| 132 | 'src', |
| 133 | 'title', |
| 134 | 'alt', |
| 135 | 'class', |
| 136 | 'style', |
| 137 | 'id', |
| 138 | 'name', |
| 139 | 'face', |
| 140 | 'size', |
| 141 | 'dir', |
| 142 | 'rel', |
| 143 | 'rev', |
| 144 | 'role', |
| 145 | 'onmouseenter', |
| 146 | 'onmouseleave', |
| 147 | 'onafterprint', |
| 148 | 'onbeforeprint', |
| 149 | 'onbeforeunload', |
| 150 | 'onhashchange', |
| 151 | 'onmessage', |
| 152 | 'onoffline', |
| 153 | 'ononline', |
| 154 | 'onpopstate', |
| 155 | 'onpagehide', |
| 156 | 'onpageshow', |
| 157 | 'onresize', |
| 158 | 'onunload', |
| 159 | 'ondevicemotion', |
| 160 | 'ondeviceorientation', |
| 161 | 'onabort', |
| 162 | 'onblur', |
| 163 | 'oncanplay', |
| 164 | 'oncanplaythrough', |
| 165 | 'onchange', |
| 166 | 'onclick', |
| 167 | 'oncontextmenu', |
| 168 | 'ondblclick', |
| 169 | 'ondrag', |
| 170 | 'ondragend', |
| 171 | 'ondragenter', |
| 172 | 'ondragleave', |
| 173 | 'ondragover', |
| 174 | 'ondragstart', |
| 175 | 'ondrop', |
| 176 | 'ondurationchange', |
| 177 | 'onemptied', |
| 178 | 'onended', |
| 179 | 'onerror', |
| 180 | 'onfocus', |
| 181 | 'oninput', |
| 182 | 'oninvalid', |
| 183 | 'onkeydown', |
| 184 | 'onkeypress', |
| 185 | 'onkeyup', |
| 186 | 'onload', |
| 187 | 'onloadeddata', |
| 188 | 'onloadedmetadata', |
| 189 | 'onloadstart', |
| 190 | 'onmousedown', |
| 191 | 'onmousemove', |
| 192 | 'onmouseout', |
| 193 | 'onmouseover', |
| 194 | 'onmouseup', |
| 195 | 'onmozfullscreenchange', |
| 196 | 'onmozfullscreenerror', |
| 197 | 'onpause', |
| 198 | 'onplay', |
| 199 | 'onplaying', |
| 200 | 'onprogress', |
| 201 | 'onratechange', |
| 202 | 'onreset', |
| 203 | 'onscroll', |
| 204 | 'onseeked', |
| 205 | 'onseeking', |
| 206 | 'onselect', |
| 207 | 'onshow', |
| 208 | 'onstalled', |
| 209 | 'onsubmit', |
| 210 | 'onsuspend', |
| 211 | 'ontimeupdate', |
| 212 | 'onvolumechange', |
| 213 | 'onwaiting', |
| 214 | 'oncopy', |
| 215 | 'oncut', |
| 216 | 'onpaste', |
| 217 | 'onbeforescriptexecute', |
| 218 | 'onafterscriptexecute', |
| 219 | ]; |
| 220 | |
| 221 | $highlighted = Strings::preg_replace_callback( |
| 222 | '/(' |
| 223 | . $highlight |
| 224 | . '="[^"]*")|' |
| 225 | . '((' |
| 226 | . implode(separator: '|', array: $attributes) |
| 227 | . ')="[^"]*' |
| 228 | . $highlight |
| 229 | . '[^"]*")|' |
| 230 | . '(' |
| 231 | . $highlight |
| 232 | . ')/mis', |
| 233 | ['phpMyFAQ\Utils', 'highlightNoLinks'], |
| 234 | $string, |
| 235 | ); |
| 236 | |
| 237 | return is_string($highlighted) ? $highlighted : $string; |
| 238 | } |
| 239 | |
| 240 | /** |
| 241 | * Callback function for filtering HTML from URLs and images. |
| 242 | * |
| 243 | * @param array<int, string> $matches Array of matches from a regex pattern |
| 244 | */ |
| 245 | public static function highlightNoLinks(array $matches): string |
| 246 | { |
| 247 | $prefix = $matches[3] ?? ''; |
| 248 | $item = $matches[4] ?? ''; |
| 249 | $postfix = $matches[5] ?? ''; |
| 250 | |
| 251 | if ($item !== '' && !self::isForbiddenElement($item)) { |
| 252 | return '<mark class="pmf-highlighted-string">' . $prefix . $item . $postfix . '</mark>'; |
| 253 | } |
| 254 | |
| 255 | // Fallback: the original matched string |
| 256 | return $matches[0]; |
| 257 | } |
| 258 | |
| 259 | /** |
| 260 | * Tries to detect if a string could be an HTML element |
| 261 | */ |
| 262 | public static function isForbiddenElement(string $string): bool |
| 263 | { |
| 264 | $forbiddenElements = [ |
| 265 | 'img', |
| 266 | 'picture', |
| 267 | 'mark', |
| 268 | ]; |
| 269 | |
| 270 | foreach ($forbiddenElements as $forbiddenElement) { |
| 271 | if (!str_starts_with($forbiddenElement, $string)) { |
| 272 | continue; |
| 273 | } |
| 274 | |
| 275 | return true; |
| 276 | } |
| 277 | |
| 278 | return false; |
| 279 | } |
| 280 | |
| 281 | /** |
| 282 | * Parses a given string and convert all the URLs into links. |
| 283 | */ |
| 284 | public static function parseUrl(string $string): string |
| 285 | { |
| 286 | $protocols = ['http://', 'https://']; |
| 287 | |
| 288 | $string = str_replace(search: $protocols, replace: '', subject: $string); |
| 289 | $string = str_replace(search: 'www.', replace: 'https://www.', subject: $string); |
| 290 | |
| 291 | $pattern = '/(https?:\/\/[^\s]+)/i'; |
| 292 | |
| 293 | return preg_replace_callback( |
| 294 | $pattern, |
| 295 | static function (array $matches): string { |
| 296 | $url = htmlspecialchars($matches[1], ENT_QUOTES, encoding: 'UTF-8'); |
| 297 | return '<a href="' . $url . '">' . $url . '</a>'; |
| 298 | }, |
| 299 | $string, |
| 300 | ) ?? $string; |
| 301 | } |
| 302 | |
| 303 | /** |
| 304 | * Extracts the hostname from a given URL. |
| 305 | * |
| 306 | * @param string $url The URL from which to extract the hostname. |
| 307 | * @return string|null The hostname or null if the URL is invalid. |
| 308 | */ |
| 309 | public static function getHostFromUrl(string $url): ?string |
| 310 | { |
| 311 | $parsedUrl = parse_url($url); |
| 312 | |
| 313 | if (is_array($parsedUrl) && array_key_exists('host', $parsedUrl)) { |
| 314 | return $parsedUrl['host']; |
| 315 | } |
| 316 | |
| 317 | return null; |
| 318 | } |
| 319 | |
| 320 | /** |
| 321 | * Moves the given key of an array to the top |
| 322 | * |
| 323 | * @param array<string, array<string, string>> $array |
| 324 | */ |
| 325 | public static function moveToTop(array &$array, string $key): void |
| 326 | { |
| 327 | if (array_key_exists($key, $array)) { |
| 328 | $temp = [$key => $array[$key]]; |
| 329 | unset($array[$key]); |
| 330 | $array = $temp + $array; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | /** |
| 335 | * Formats a given number of Bytes to kB, MB, GB, and so on. |
| 336 | */ |
| 337 | public static function formatBytes(float|int $bytes, int $precision = 2): string |
| 338 | { |
| 339 | $units = ['B', 'KB', 'MB', 'GB', 'TB']; |
| 340 | |
| 341 | $bytes = max($bytes, 0); |
| 342 | $pow = floor(($bytes !== 0 ? log($bytes) : 0) / log(num: 1024)); |
| 343 | $pow = min($pow, count($units) - 1); |
| 344 | |
| 345 | $bytes /= 1 << (10 * $pow); |
| 346 | |
| 347 | return round($bytes, $precision) . ' ' . $units[$pow]; |
| 348 | } |
| 349 | } |