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mb_strpos

Description

The mb_strpos of Multibyte String for PHP finds the position of the first occurrence of string within a string.

Syntax

mb_strpos(
    string $haystack,
    string $needle,
    int $offset = 0,
    ?string $encoding = null
): int|false

Parameters

haystack

The string being checked.

needle

The string to find in haystack. In contrast with strpos(), numeric values are not applied as the ordinal value of a character.

offset

The search offset. If it is not specified, 0 is used. A negative offset counts from the end of the string.

encoding

The encoding parameter is the character encoding. If it is omitted or null, the internal character encoding value will be used.

Return

Returns the numeric position of the first occurrence of needle in the haystack string, or false if needle is not found.

Examples

1 · haystack needle

<?

$haystack = 'string🐘string🐘string';
$needle = '🐘string';

$return = mb_strpos($haystack, $needle);

echo $return;

6

2 · offset · negative

<?

$haystack = 'string🐘string🐘string';
$needle = '🐘string';
$offset = -10;

$return = mb_strpos($haystack, $needle, $offset);

echo $return;

13

3 · offset · non-negative

<?

$haystack = 'string🐘string🐘string';
$needle = '🐘string';
$offset = 10;

$return = mb_strpos($haystack, $needle, $offset);

echo $return;

13

4 · encoding

<?

$haystack = 'string🐘string🐘string';
$needle = '🐘string';
$offset = 10;
$encoding = 'UTF-8';

$return = mb_strpos($haystack, $needle, $offset, $encoding);

echo $return;

13