略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: Ds\Set::filter

2024-11-12

Ds\Set::filter

(PECL ds >= 1.0.0)

Ds\Set::filter Creates a new set using a callable to determine which values to include

说明

public Ds\Set::filter(callable $callback = ?): Ds\Set

Creates a new set using a callable to determine which values to include.

参数

callback

callback(mixed $value): bool

Optional callable which returns true if the value should be included, false otherwise.

If a callback is not provided, only values which are true (see converting to boolean) will be included.

返回值

A new set containing all the values for which either the callback returned true, or all values that convert to true if a callback was not provided.

范例

示例 #1 Ds\Set::filter() example using callback function

<?php
$set 
= new \Ds\Set([12345]);

var_dump($set->filter(function($value) {
    return 
$value == 0;
}));
?>

以上例程的输出类似于:

object(Ds\Set)#3 (2) {
  [0]=>
  int(2)
  [1]=>
  int(4)
}

示例 #2 Ds\Set::filter() example without a callback function

<?php
$set 
= new \Ds\Set([01'a'truefalse]);

var_dump($set->filter());
?>

以上例程的输出类似于:

object(Ds\Set)#2 (3) {
  [0]=>
  int(1)
  [1]=>
  string(1) "a"
  [2]=>
  bool(true)
}
add a noteadd a note

User Contributed Notes

There are no user contributed notes for this page.

官方地址:https://www.php.net/manual/en/ds-set.filter.php

北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3