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1 <?php
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2 /**
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3 * Zend Framework (http://framework.zend.com/)
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4 *
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5 * @link http://github.com/zendframework/zf2 for the canonical source repository
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6 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
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7 * @license http://framework.zend.com/license/new-bsd New BSD License
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8 */
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9
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10 namespace Zend\Stdlib\StringWrapper;
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11
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12 use Zend\Stdlib\Exception;
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13
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14 class Intl extends AbstractStringWrapper
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15 {
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16 /**
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17 * List of supported character sets (upper case)
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18 *
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19 * @var string[]
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20 */
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21 protected static $encodings = ['UTF-8'];
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22
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23 /**
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24 * Get a list of supported character encodings
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25 *
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26 * @return string[]
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27 */
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28 public static function getSupportedEncodings()
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29 {
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30 return static::$encodings;
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31 }
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32
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33 /**
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34 * Constructor
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35 *
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36 * @throws Exception\ExtensionNotLoadedException
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37 */
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38 public function __construct()
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39 {
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40 if (! extension_loaded('intl')) {
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41 throw new Exception\ExtensionNotLoadedException(
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42 'PHP extension "intl" is required for this wrapper'
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43 );
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44 }
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45 }
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46
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47 /**
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48 * Returns the length of the given string
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49 *
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50 * @param string $str
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51 * @return int|false
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52 */
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53 public function strlen($str)
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54 {
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55 return grapheme_strlen($str);
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56 }
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57
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58 /**
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59 * Returns the portion of string specified by the start and length parameters
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60 *
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61 * @param string $str
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62 * @param int $offset
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63 * @param int|null $length
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64 * @return string|false
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65 */
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66 public function substr($str, $offset = 0, $length = null)
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67 {
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68 // Due fix of PHP #62759 The third argument returns an empty string if is 0 or null.
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69 if ($length !== null) {
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70 return grapheme_substr($str, $offset, $length);
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71 }
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72
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73 return grapheme_substr($str, $offset);
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74 }
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75
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76 /**
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77 * Find the position of the first occurrence of a substring in a string
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78 *
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79 * @param string $haystack
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80 * @param string $needle
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81 * @param int $offset
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82 * @return int|false
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83 */
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84 public function strpos($haystack, $needle, $offset = 0)
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85 {
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86 return grapheme_strpos($haystack, $needle, $offset);
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87 }
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88 }
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