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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * The main string wrapper class. |
| 5 | * |
| 6 | * The class uses the mbstring extension if available. It's strongly recommended |
| 7 | * to use and extend this class instead of using direct string functions. Doing so, |
| 8 | * you guarantee your code is upwards compatible with UTF-8 improvements. All |
| 9 | * the string methods behavior is identical to that of the same named |
| 10 | * single byte string functions. |
| 11 | * This Source Code Form is subject to the terms of the Mozilla Public License, |
| 12 | * v. 2.0. If a copy of the MPL was not distributed with this file, You can |
| 13 | * obtain one at https://mozilla.org/MPL/2.0/. |
| 14 | * |
| 15 | * @package phpMyFAQ |
| 16 | * @author Anatoliy Belsky <ab@php.net> |
| 17 | * @copyright 2009-2026 phpMyFAQ Team |
| 18 | * @license https://www.mozilla.org/MPL/2.0/ Mozilla Public License Version 2.0 |
| 19 | * @link https://www.phpmyfaq.de |
| 20 | * @since 2009-04-06 |
| 21 | */ |
| 22 | |
| 23 | declare(strict_types=1); |
| 24 | |
| 25 | namespace phpMyFAQ; |
| 26 | |
| 27 | use phpMyFAQ\Strings\Mbstring; |
| 28 | use phpMyFAQ\Strings\StringBasic; |
| 29 | |
| 30 | /** |
| 31 | * Class Strings |
| 32 | * |
| 33 | * @package phpMyFAQ |
| 34 | */ |
| 35 | class Strings |
| 36 | { |
| 37 | /** |
| 38 | * Instance. |
| 39 | */ |
| 40 | private static Mbstring|StringBasic|null $instance = null; |
| 41 | |
| 42 | /** |
| 43 | * Constructor. |
| 44 | */ |
| 45 | final private function __construct() |
| 46 | { |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * Init. |
| 51 | * |
| 52 | * @param string $language Language |
| 53 | */ |
| 54 | public static function init(string $language = 'en'): void |
| 55 | { |
| 56 | if (self::$instance !== null) { |
| 57 | return; |
| 58 | } |
| 59 | |
| 60 | if (extension_loaded('mbstring') && function_exists('mb_strlen')) { |
| 61 | self::$instance = Mbstring::getInstance($language); |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | self::$instance = StringBasic::getStringBasic($language); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * Returns the initialized implementation, bootstrapping with the default |
| 70 | * language when init() has not been called yet. |
| 71 | */ |
| 72 | private static function instance(): Mbstring|StringBasic |
| 73 | { |
| 74 | self::init(); |
| 75 | |
| 76 | return self::$instance ?? throw new \LogicException('Strings could not be initialized.'); |
| 77 | } |
| 78 | |
| 79 | /** |
| 80 | * Get string character count. |
| 81 | * |
| 82 | * @param string $str String |
| 83 | */ |
| 84 | public static function strlen(string $str): int |
| 85 | { |
| 86 | return self::instance()->strlen($str); |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Get a part of string. |
| 91 | * |
| 92 | * @param string $string String |
| 93 | * @param int $start Start |
| 94 | * @param int|null $length Length |
| 95 | */ |
| 96 | public static function substr(string $string, int $start, ?int $length = 0): string |
| 97 | { |
| 98 | return self::instance()->substr($string, $start, $length); |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Make a string lower case. |
| 103 | * |
| 104 | * @param string $str String |
| 105 | */ |
| 106 | public static function strtolower(string $str): string |
| 107 | { |
| 108 | return self::instance()->strtolower($str); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Make a string upper case. |
| 113 | * |
| 114 | * @param string $str String |
| 115 | */ |
| 116 | public static function strtoupper(string $str): string |
| 117 | { |
| 118 | return self::instance()->strtoupper($str); |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Get the occurrence of a string within another. |
| 123 | * |
| 124 | * @param string $haystack Haystack |
| 125 | * @param string $needle Needle |
| 126 | * @param bool $part Part |
| 127 | */ |
| 128 | public static function strstr(string $haystack, string $needle, bool $part = false): string|false |
| 129 | { |
| 130 | return self::instance()->strstr($haystack, $needle, $part); |
| 131 | } |
| 132 | |
| 133 | /** |
| 134 | * Match a regexp. |
| 135 | * |
| 136 | * @param array<array-key, mixed>|null $matches |
| 137 | */ |
| 138 | public static function preg_match( |
| 139 | string $pattern, |
| 140 | string $subject, |
| 141 | &$matches = null, |
| 142 | int $flags = 0, |
| 143 | int $offset = 0, |
| 144 | ): int { // phpcs:ignore |
| 145 | return (int) self::instance()->preg_match($pattern, $subject, $matches, $flags, $offset); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Match a regexp globally. |
| 150 | * |
| 151 | * @param array<array-key, mixed>|null $matches |
| 152 | */ |
| 153 | public static function preg_match_all( |
| 154 | string $pattern, |
| 155 | string $subject, |
| 156 | &$matches = null, |
| 157 | int $flags = 0, |
| 158 | int $offset = 0, |
| 159 | ): int { // phpcs:ignore |
| 160 | return (int) self::instance()->preg_match_all($pattern, $subject, $matches, $flags, $offset); |
| 161 | } |
| 162 | |
| 163 | /** |
| 164 | * Split string by a regexp. |
| 165 | */ |
| 166 | public static function preg_split(string $pattern, string $subject, int $limit = -1, int $flags = 0): array|bool |
| 167 | { // phpcs:ignore |
| 168 | return self::instance()->preg_split($pattern, $subject, $limit, $flags); |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Search and replace by a regexp using a callback. |
| 173 | * |
| 174 | * @param callable(array<array-key, string>): string $callback |
| 175 | * @param string|string[] $subject |
| 176 | */ |
| 177 | public static function preg_replace_callback( |
| 178 | string $pattern, |
| 179 | callable $callback, |
| 180 | string|array $subject, |
| 181 | int $limit = -1, |
| 182 | int &$count = 0, |
| 183 | ): string|array|null { |
| 184 | return self::instance()->preg_replace_callback($pattern, $callback, $subject, $limit, $count); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Search and replace by a regexp. |
| 189 | * |
| 190 | * @param string|string[] $pattern |
| 191 | * @param string|string[] $replacement |
| 192 | * @param string|string[] $subject |
| 193 | * @return string|string[]|null |
| 194 | */ |
| 195 | public static function preg_replace( |
| 196 | string|array $pattern, |
| 197 | string|array $replacement, |
| 198 | string|array $subject, |
| 199 | int $limit = -1, |
| 200 | int &$count = 0, |
| 201 | ): string|array|null { |
| 202 | return self::instance()->preg_replace($pattern, $replacement, $subject, $limit, $count); |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Convert special chars to HTML entities. |
| 207 | * |
| 208 | * @param string|null $string The input string. |
| 209 | * @param int $quoteStyle Quote style |
| 210 | * @param string $charset Character set, UTF-8 by default |
| 211 | * @param bool $doubleEncode If set to false, no encoding of existing entities |
| 212 | */ |
| 213 | public static function htmlspecialchars( |
| 214 | ?string $string = '', |
| 215 | int $quoteStyle = ENT_HTML5, |
| 216 | string $charset = 'utf-8', |
| 217 | bool $doubleEncode = false, |
| 218 | ): string { |
| 219 | return htmlspecialchars((string) $string, $quoteStyle, $charset, $doubleEncode); |
| 220 | } |
| 221 | |
| 222 | /** |
| 223 | * Convert all applicable characters to HTML entities. |
| 224 | * |
| 225 | * @param string $string The input string. |
| 226 | * @param int $quoteStyle Quote style |
| 227 | * @param string $charset Character set, UTF-8 by default |
| 228 | * @param bool $doubleEncode If set to false, no encoding of existing entities |
| 229 | */ |
| 230 | public static function htmlentities( |
| 231 | string $string, |
| 232 | int $quoteStyle = ENT_HTML5, |
| 233 | string $charset = 'utf-8', |
| 234 | bool $doubleEncode = false, |
| 235 | ): string { |
| 236 | return htmlentities($string, $quoteStyle, $charset, $doubleEncode); |
| 237 | } |
| 238 | } |