ArrayIterator::uasort

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

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

Descripción

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:
Si dos miembros se comparan como iguales, su orden relativo en el array oredenado será indefinido.

Parámetros

callback: La función de comparación debe devolver un entero menor, igual o mayor que cero si el primer argumento se considera que sea respectivamente menor, igual o mayor que el segundo. Observe que antes de PHP 7.0.0 este entero debía estar en el rango de -2147483648 a 2147483647.

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

Precaución
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.

Valores devueltos

Siempre devuelve true.

Historial de cambios

Versión	Descripción
8.2.0	The return type is `true` now; previously, it was bool.

Ver también

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() - Ordena un array con una función de comparación definida por el usuario y mantiene la asociación de índices

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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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