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PHP - Manual: grapheme_substr

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IDN 函数 » « grapheme_strstr
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  • intl
  • Grapheme 函数

grapheme_substr

(PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.0)

grapheme_substr — Return part of a string

说明

过程化风格

grapheme_substr(string $string, int $offset, ?int $length = null): string|false

Return part of a string

参数

string

The input string. Must be valid UTF-8.

offset

Start position in default grapheme units. If $start is non-negative, the returned string will start at the $start'th position in $string, counting from zero. If $start is negative, the returned string will start at the $start'th grapheme unit from the end of string.

length

Length in grapheme units. If $length is given and is positive, the string returned will contain at most $length grapheme units beginning from $start (depending on the length of string). If $length is given and is negative, then that many grapheme units will be omitted from the end of string (after the start position has been calculated when a start is negative). If $start denotes a position beyond this truncation, false will be returned.

返回值

Returns the extracted part of string, 或者在失败时返回 false.

范例

示例 #1 grapheme_substr() example

<?php

$char_a_ring_nfd = "a\xCC\x8A";  // 'LATIN SMALL LETTER A WITH RING ABOVE' (U+00E5) normalization form "D"
$char_o_diaeresis_nfd = "o\xCC\x88"; // 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"

print urlencode(grapheme_substr( "ao" . $char_a_ring_nfd . "bc" . $char_o_diaeresis_nfd . "O", 2, -1 ));
?>

以上例程会输出:

a%CC%8Abco%CC%88

参见

  • grapheme_extract() - Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8
  • »  Unicode Text Segmentation: Grapheme Cluster Boundaries
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官方地址:https://www.php.net/manual/en/function.grapheme-substr.php

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