Find position (in grapheme units) of first occurrence of a string

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- PHP Manual
- Grapheme Functions
- Find position (in grapheme units) of first occurrence of a string

# grapheme_strpos

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

grapheme_strpos — Find position (in grapheme units) of first occurrence of a string

### Description

Procedural style

grapheme_strpos(string `$haystack`, string `$needle`, int `$offset` = 0): int|false

Find position (in grapheme units) of first occurrence of a string

### Parameters

`haystack`

  The string to look in. Must be valid UTF-8.

`needle`

  The string to look for. Must be valid UTF-8.

`offset`

  The optional `offset` parameter allows you to specify where in `haystack` to start searching as an offset in grapheme units (not bytes or characters). If the offset is negative, it is treated relative to the end of the string. The position returned is still relative to the beginning of `haystack` regardless of the value of `offset`.

### Return Values

Returns the position as an integer. If `needle` is not found, grapheme_strpos() will return `false`.

### Changelog

Version | Description
--- | ---
7.1.0 | Support for negative `offset`s has been added.

### Examples

Example #1 grapheme_strpos() 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 grapheme_strpos( $char_a_ring_nfd . $char_a_ring_nfd . $char_o_diaeresis_nfd, $char_o_diaeresis_nfd);?>

The above example will output:

    2

### See Also

- grapheme_stripos() - Find position (in grapheme units) of first occurrence of a case-insensitive string
- grapheme_stristr() - Returns part of haystack string from the first occurrence of case-insensitive needle to the end of haystack
- grapheme_strripos() - Find position (in grapheme units) of last occurrence of a case-insensitive string
- 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
- » Unicode Text Segmentation: Grapheme Cluster Boundaries