php常用数组array函数实例总结【赋值,拆分,合并,计算,添加,删除,查询,判断,排序】


Posted in PHP onDecember 07, 2016

本文实例总结了php常用数组array函数。分享给大家供大家参考,具体如下:

array_combine

功能:用一个数组的值作为新数组的键名,另一个数组的值作为新数组的值

案例:

<?php
$a = array("one","two","three");
$b = array("一","二","三");
$c = array_combine($a,$b);
print_r($c);
/**结果
*Array ( [one] => 一 [two] => 二 [three] => 三 )
*/

array_chunk

功能:拆分数组成多个数组

<?php
$input_array = array("a"=>"apple","b"=>"blue","c","d","e");
echo "<pre>";
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2,True));
echo "</pre>";
/**结果
Array
(
 [0] => Array
  (
   [0] => apple
   [1] => blue
  )
 [1] => Array
  (
   [0] => c
   [1] => d
  )
 [2] => Array
  (
   [0] => e
  )
)
Array
(
 [0] => Array
  (
   [a] => apple
   [b] => blue
  )
 [1] => Array
  (
   [0] => c
   [1] => d
  )
 [2] => Array
  (
   [2] => e
  )
)
*/

array_count_values

功能:统计数组中值出现的次数

<?php
$input_array = array("a"=>"apple","b"=>"blue","c","d","e");
echo "<pre>";
print_r(array_count_values($input_array));
echo "</pre>";
/**结果
Array
(
 [apple] => 1
 [blue] => 1
 [c] => 1
 [d] => 1
 [e] => 1
)
*/

array_diff

功能:第一个数组中去掉第二个数组中有的数据,返回剩下的内容作为结果

<?php
$array1 = array("a"=>"apple","b"=>"blue","c","d","e");
$array2 = array("apple","c","d","f");
$result = array_diff($array1, $array2);
$result2 = array_diff($array2, $array1);
echo "<pre>";
print_r($result);//数组1中去掉数组2中剩下的
print_r($result2);//数组2中去掉数组1中剩下的
echo "</pre>";
/**结果
Array
(
 [b] => blue
 [2] => e
)
Array
(
 [3] => f
)
*/

array_map

功能:将回调函数执行到数组中

<?php
//定义回调函数
function cube($n){
 return ($n*$n*$n);
}
$a = array(1,2,3,4,5);
$b = array_map("cube",$a);
echo "<pre>";
print_r($b);
echo "</pre>";
/**结果
Array
(
 [0] => 1
 [1] => 8
 [2] => 27
 [3] => 64
 [4] => 125
)
*/

array_merge

功能:合并一个或多个数组

说明:如果后面有键名相同的会覆盖掉前面的内容,键名为数字的会添加到后面

<?php
$array1 = array("color"=>"red",2,4);
$array2 = array("a","b","color"=>"green","shape"=>"trapezoid",4);
$result1 = array_merge($array1,$array2);
$result2 = array_merge_recursive($array1,$array2);
echo "<pre>";
print_r($result1);
print_r($result2);
echo "</pre>";
/**结果
Array
(
 [color] => green
 [0] => 2
 [1] => 4
 [2] => a
 [3] => b
 [shape] => trapezoid
 [4] => 4
)
Array
(
 [color] => Array
  (
   [0] => red
   [1] => green
  )
 [0] => 2
 [1] => 4
 [2] => a
 [3] => b
 [shape] => trapezoid
 [4] => 4
)
*/

array_pop

功能:剔除数组最后一个元素,返回被剔除的元素内容

<?php
$stack = array("orange","banana","apple","1");
$last = array_pop($stack);
echo "<pre>";
print_r($stack);
print_r($last);
echo "</pre>";
/**结果
Array
(
 [0] => orange
 [1] => banana
 [2] => apple
)
1
*/

array_push

功能:将一个多个单元压入数组末尾,返回之后的数组个数

<?php
$stack = array("orange","banana");
$count = array_push($stack,"apple","red","blue");
echo "<pre>";
print_r($stack);
print_r($count);
echo "</pre>";
/**结果
Array
(
 [0] => orange
 [1] => banana
 [2] => apple
 [3] => red
 [4] => blue
)
5
*/

array_rand

功能:获取随机的键名

<?php
$input = array("orange","banana","apple","red","blue");
$rand = array_rand($input,2);;
print_r($rand);
$rand = array_rand($input,3);
print_r($rand);
/**结果
Array
(
 [0] => 1
 [1] => 4
)
Array
(
 [0] => 0
 [1] => 1
 [2] => 3
)
*/

array_search

功能:查询数组中的内容,返回键值,如果有多个匹配,返回第一个匹配的内容

<?php
$array = array("blue"=>"b","red"=>"r","green","r");
$key = array_search('b', $array);
echo $key;
echo "<br>";
$key = array_search('r', $array);
echo $key;
echo "<br>";
/**结果
blue
red
*/

array_shift

功能:移除开头的元素,与array_pop相反

<?php
$fruit = array("milk","orange","banana","apple");
$top = array_shift($fruit);
print_r($top);
echo "<br>";
print_r($fruit);
/**结果
milk
Array ( [0] => orange [1] => banana [2] => apple )
*/

array_unique

功能:去除数组重复的元素,保留第一个出现的,包括键名和值

<?php
$input = array("a"=>"green","red","b"=>"green","blue","c"=>"red");
$result = array_unique($input);
print_r($result);
echo "<br>";
print_r($input);
/**结果
Array ( [a] => green [0] => red [1] => blue )
Array ( [a] => green [0] => red [b] => green [1] => blue [c] => red )
*/

array_slice

功能:从数组中取出部分元素

<?php
$input = array("a","b","c","d","e");
$output = array_slice($input,2);//第二个参数没有时,表示取到最后一个元素
print_r($output);
echo "<br>";
$output = array_slice($input,-2,1);//第二个参数是正数时,表示个数;倒数第一个是-1,倒数第二个是-2
print_r($output);
echo "<br>";
$output = array_slice($input,0,3);
print_r($output);
echo "<br>";
$output = array_slice($input,2,-1);//第二个参数是负数时,表示位置,取到哪一位,不包括本身
print_r($output);
echo "<br>";
$output = array_slice($input,2,-1,true);//第三个参数为true时,保留原有的键值
print_r($output);
echo "<br>";
/**结果
Array ( [0] => c [1] => d [2] => e )
Array ( [0] => d )
Array ( [0] => a [1] => b [2] => c )
Array ( [0] => c [1] => d )
Array ( [2] => c [3] => d )
*/

count

功能:返回数组元素个数,元素为数组的算一个

<?php
$input = array("a","b","c",array("d","e"));
$count = count($input);
echo $count;
echo "<br>";
$input = array("a","b","c","d","e");
$count = count($input);
echo $count;
/**结果
4
5
*/

current

功能:获取当前的指针指向元素

<?php
$array = array("foot","bike","car","plane");
$result = current($array);
echo $result."<br>";
next($array);//使指针指向下一个元素
$result = current($array);
echo $result."<br>";
prev($array);//使指针指向前一个元素
$result = current($array);
echo $result."<br>";
end($array);//使指针指向最后一个元素
$result = current($array);
echo $result."<br>";
/**结果
foot
bike
foot
plane
*/

in_array

功能:检验某值是否存在数组中,有返回True,没有返回False

<?php
$os_list = array("Mac","NT","Irix","Linux");
if(in_array("Irix",$os_list)){
 echo "当前操作系统列表中存在Irix";
}else{
 echo "当前操作系统列表中不存在Irix";
}
echo "<br>";
if(in_array("mac",$os_list)){
 echo "当前操作系统列表中存在mac";
}else{
 echo "当前操作系统列表中不存在mac";
}
echo "<br>";
/**结果
当前操作系统列表中存在Irix
当前操作系统列表中不存在mac
*/

list

功能:将数组中的信息赋值给多个变量

<?php
$info = array("red","blue","green");
list($flag,$sky,$grassland) = $info;
echo "$flag,$sky,$grassland";
echo "<br>";
list($flag,,$grassland) = $info;
echo "$flag,$grassland";
echo "<br>";
list(,,$grassland) = $info;
echo "$grassland";
echo "<br>";
/**结果
red,blue,green
red,green
green
*/

shuffle

功能:打乱数组

<?php
$numbers = range(1,5);//生成一个随机数组
print_r($numbers);
echo "<br/>";
shuffle($numbers);//打乱数组
print_r($numbers);
/**结果
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
Array ( [0] => 4 [1] => 1 [2] => 5 [3] => 2 [4] => 3 )
*/

array_keys

功能:获取数组的键名,第二个参数可以指定获取某个元素

<?php
$array = array(0=>100,"color"=>"red");
print_r(array_keys($array));
echo "<br>";
$array = array("blue","red","green","blue","blue");
print_r(array_keys($array,"blue"));
echo "<br>";
$array = array("color"=>array("blue","red","green"),"size"=>array("small","medium","large"));
print_r(array_keys($array));
echo "<br>";
/**结果
Array ( [0] => 0 [1] => color )
Array ( [0] => 0 [1] => 3 [2] => 4 )
Array ( [0] => color [1] => size )
*/

array_reverse

功能:获取数组的反向

<?php
$input = array("php",3.0,array("green","red"));
$result = array_reverse($input); //打乱键名
$result_keyed = array_reverse($input,TRUE);//保留键名
print_r($result);
print_r($result_keyed);
/**结果
Array
(
 [0] => Array
  (
   [0] => green
   [1] => red
  )
 [1] => 3
 [2] => php
)
Array
(
 [2] => Array
  (
   [0] => green
   [1] => red
  )
 [1] => 3
 [0] => php
)
*/

arsort

功能:逆向排序,索引不变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
arsort($fruits);//按照字符逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
b = orange
a = lemon
c = banana
d = apple
*/

asort

功能:进行正向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
arsort($fruits);//按照字符逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
echo "<p>";
asort($fruits);//按照字符正向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
b = orange
a = lemon
c = banana
d = apple
d = apple
c = banana
a = lemon
b = orange
*/

krsort

功能:按照键名进行逆向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
krsort($fruits);//按照键名逆向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
d = apple
c = banana
b = orange
a = lemon
*/

ksort

功能:按照键名进行正向排序

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
ksort($fruits);//按照键名正向排序或数字
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
a = lemon
b = orange
c = banana
d = apple
*/

rsort

功能:按照值进行逆向排序,键名改变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
rsort($fruits);//按照值进行逆向排序或数字,键名改变
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
0 = orange
1 = lemon
2 = banana
3 = apple
*/

sort

功能:按照值进行正向排序,键名改变

<?php
$fruits = array(
 "a"=>"lemon",
 "b"=>"orange",
 "c"=>"banana",
 "d"=>"apple",
 );
sort($fruits);//按照值进行逆向排序或数字,键名改变
foreach($fruits as $key=>$val){
 echo "$key = $val<br>";
}
/**结果
0 = apple
1 = banana
2 = lemon
3 = orange
*/

希望本文所述对大家PHP程序设计有所帮助。

PHP 相关文章推荐
关于时间计算的结总
Dec 06 PHP
PHP Session_Regenerate_ID函数双释放内存破坏漏洞
Jan 27 PHP
php使用$_POST或$_SESSION[]向js函数传参
Sep 16 PHP
php使用glob函数快速查询指定目录文件的方法
Nov 15 PHP
CodeIgniter配置之routes.php用法实例分析
Jan 19 PHP
PHP中读取文件的几个方法总结(推荐)
Jun 03 PHP
php使用curl实现简单模拟提交表单功能
May 15 PHP
php实现的redis缓存类定义与使用方法示例
Aug 09 PHP
PHP文件管理之实现网盘及压缩包的功能操作
Sep 20 PHP
PHP二维数组实现去除重复项的方法【保留各个键值】
Dec 21 PHP
PHP单元测试框架PHPUnit用法详解
Jan 23 PHP
PHP设计模式(四)原型模式Prototype实例详解【创建型】
May 02 PHP
php常用字符串String函数实例总结【转换,替换,计算,截取,加密】
Dec 07 #PHP
php自定义时间转换函数示例
Dec 07 #PHP
php微信公众平台开发(四)回复功能开发
Dec 06 #PHP
php微信公众平台开发(三)订阅事件处理
Dec 06 #PHP
php微信公众平台示例代码分析(二)
Dec 06 #PHP
php微信公众平台开发(一) 配置接口
Dec 06 #PHP
php简单计算年龄的方法(周岁与虚岁)
Dec 06 #PHP
You might like
《神奇女侠:血脉》神力女超人大战犯罪公司
2020/04/09 欧美动漫
PHP设置图片文件上传大小的具体实现方法
2013/10/11 PHP
PHP调用API接口实现天气查询功能的示例
2017/09/21 PHP
PHP过滤器 filter_has_var() 函数用法实例分析
2020/04/23 PHP
jQuery代码优化 事件委托篇
2011/11/01 Javascript
浅谈Javascript 执行顺序
2013/12/18 Javascript
javascript获取web应用根目录的方法
2014/02/12 Javascript
JavaScript判断变量是对象还是数组的方法
2014/08/28 Javascript
简述jQuery ajax的执行顺序
2016/01/05 Javascript
JavaScript事件处理的方式(三种)
2016/04/26 Javascript
jQuery实现背景弹性滚动的导航效果
2016/06/01 Javascript
node.js中module.exports与exports用法上的区别
2016/09/02 Javascript
JS实现图片上传预览功能
2016/11/21 Javascript
jQuery滑动到底部加载下一页数据的实例代码
2017/05/22 jQuery
使用 Node.js 模拟滑动拼图验证码操作的示例代码
2017/11/02 Javascript
微信小程序实现页面浮动导航
2019/01/28 Javascript
webpack常用配置总览(小结)
2019/11/18 Javascript
JQuery实现折叠式菜单的详细代码
2020/06/03 jQuery
[00:35]DOTA2上海特级锦标赛 MVP.Phx战队宣传片
2016/03/04 DOTA
Python装饰器使用示例及实际应用例子
2015/03/06 Python
pandas 使用均值填充缺失值列的小技巧分享
2019/07/04 Python
处理python中多线程与多进程中的数据共享问题
2019/07/28 Python
PyCharm专业最新版2019.1安装步骤(含激活码)
2019/10/09 Python
M1芯片安装python3.9.1的实现
2021/02/02 Python
Manduka官网:瑜伽垫、瑜伽毛巾和服装
2018/07/02 全球购物
SmartBuyGlasses荷兰:购买太阳镜和眼镜
2020/03/16 全球购物
安全资金保障制度
2014/01/23 职场文书
计算机专业求职信
2014/06/02 职场文书
机关作风建设剖析材料
2014/10/11 职场文书
2014年质检员工作总结
2014/11/18 职场文书
2015年安全生产责任书
2015/01/30 职场文书
2015年预防青少年违法犯罪工作总结
2015/05/22 职场文书
地道战观后感400字
2015/06/04 职场文书
python实现调用摄像头并拍照发邮箱
2021/04/27 Python
pytorch 使用半精度模型部署的操作
2021/05/24 Python
Nginx性能优化之Gzip压缩设置详解(最大程度提高页面打开速度)
2022/02/12 Servers