mb_strpos

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

mb_strpos — Find position of first occurrence of string in a string

Descrizione

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

Finds position of the first occurrence of needle in the haystack string.

Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on.

Elenco dei parametri

haystack

The string from which to get the position of the first occurrence of needle.

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

encoding

Il parametro encoding è la codifica dei caratteri. Se è omesso, verrà utilizzata la codifica interna.

Valori restituiti

Returns the character position (not byte position) of the first occurrence of needle in the haystack string, counting from 0. Returns false if needle is not found.

Errori/Eccezioni

  • If offset is greater than the length of haystack, a ValueError will be thrown.

Log delle modifiche

Versione Descrizione
8.0.0 needle now accepts an empty string.
8.0.0 encoding is nullable now.
7.1.0 Support for negative offsets has been added.

Esempi

Example #1 mb_strpos() returns a character offset, not a byte offset

<?php
// "🐘" is 4 bytes but 1 character; "é" is 2 bytes but 1 character
$str = "🐘H🐘é";

var_dump(mb_strpos($str, "é"));  // character 3, not byte 9
var_dump(mb_strpos($str, "🐘", 1)); // character 2, skipping the first "🐘"
?>

Il precedente esempio visualizzerà:

int(3)
int(2)

Vedere anche:

  • mb_strrpos() - Find position of last occurrence of a string in a string
  • mb_stripos() - Finds position of first occurrence of a string within another, case insensitive
  • mb_internal_encoding() - Set/Get internal character encoding
  • strpos() - Trova la posizione della prima occorrenza di una stringa

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