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[PHP 8.4][Intl] Add
grapheme_str_split
Add a polyfill for the `grapheme_str_split` function added in PHP 8.4. Requires PHP 7.3, because the polyfill is based on `\X` Regex, and it only works properly on PCRE2, which [only comes with PHP 7.3+](https://php.watch/versions/7.3/pcre2). Further, there are some cases that the polyfill cannot split complex characters (such as two consecutive country flag Emojis). This is now fixed in [PCRE2Project/pcre2#410](PCRE2Project/pcre2#410). However, this change will likely only make it to PHP 8.4. References: - [RFC: Grapheme cluster for `str_split` function: `grapheme_str_split`](https://wiki.php.net/rfc/grapheme_str_split) - [PHP.Watch: PHP 8.4: New `grapheme_str_split` function](https://php.watch/versions/8.4/grapheme_str_split)
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Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -26,6 +26,7 @@ | |
* - grapheme_strrpos - Find position (in grapheme units) of last occurrence of a string | ||
* - grapheme_strstr - Returns part of haystack string from the first occurrence of needle to the end of haystack | ||
* - grapheme_substr - Return part of a string | ||
* - grapheme_str_split - Splits a string into an array of individual or chunks of graphemes. | ||
* | ||
* @author Nicolas Grekas <[email protected]> | ||
* | ||
|
@@ -191,6 +192,36 @@ public static function grapheme_strstr($s, $needle, $beforeNeedle = false) | |
return mb_strstr($s, $needle, $beforeNeedle, 'UTF-8'); | ||
} | ||
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||
public static function grapheme_str_split($s, $len = 1) { | ||
if (0 > $len || 1073741823 < $len) { | ||
if (80000 > \PHP_VERSION_ID) { | ||
return false; | ||
} | ||
|
||
throw new \ValueError('grapheme_str_split(): Argument #2 ($length) must be greater than 0 and less than or equal to 1073741823.'); | ||
} | ||
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if ('' === $s) { | ||
return []; | ||
} | ||
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if (!preg_match_all('/('.SYMFONY_GRAPHEME_CLUSTER_RX.')/u', $s, $matches)) { | ||
return false; | ||
} | ||
|
||
if (1 === $len) { | ||
return $matches[0]; | ||
} | ||
|
||
$chunks = array_chunk($matches[0], $len); | ||
|
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foreach ($chunks as &$chunk) { | ||
$chunk = implode('', $chunk); | ||
} | ||
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return $chunks; | ||
} | ||
|
||
private static function grapheme_position($s, $needle, $offset, $mode) | ||
{ | ||
$needle = (string) $needle; | ||
|
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