ArrayIterator::uasort

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

ArrayIterator::uasort — Sort with a user-defined comparison function and maintain index association

Descrizione

public ArrayIterator::uasort(callable $callback): true

This method sorts the elements such that indices maintain their correlation with the values they are associated with, using a user-defined comparison function.

Nota:
If two members compare as equal, they retain their original order. Prior to PHP 8.0.0, their relative order in the sorted array was undefined.

Elenco dei parametri

callback: La funzione di confronto deve restituire un intero minore, uguale o maggiore di zero se il primo argomento è considerato essere minore, uguale o maggiore del secondo.

callback(mixed $a, mixed $b): int

Attenzione
Returning non-integer values from the comparison function, such as float, will result in an internal cast to int of the callback's return value. So values such as 0.99 and 0.1 will both be cast to an integer value of 0, which will compare such values as equal.

Valori restituiti

Always returns true.

Log delle modifiche

Versione	Descrizione
8.2.0	The return type is `true` now; previously, it was bool.

Vedere anche:

ArrayIterator::asort() - Sort entries by values
ArrayIterator::ksort() - Sort entries by keys
ArrayIterator::natcasesort() - Sort entries naturally, case insensitive
ArrayIterator::natsort() - Sort entries naturally
ArrayIterator::uksort() - Sort by keys using a user-defined comparison function
uasort() - Ordina un array mediante una funzione definita dall'utente e mantiene le associazioni

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User Contributed Notes 1 note

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Massimiliano Arione ¶

9 years ago


Even if documentation says that $cmp_function must be a string, this method works with a Callable also.
Example:

<?php

$iterator->uasort([$this, 'usort']);  // 'usort' here is a method in the same class

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