PHP implements array operations

This article mainly shares with you how to implement array operations in PHP, mainly in the form of text and code. I hope it can help you.

Statistical related

array_sum(array) Statistical array sum
array_product(array) Statistical array product

Example

// 已有字符串2，3，4，5，19，39
$str = '2,3,4,5,19,39';
$arr = explode(',',$str);
// 1. array_sum(数组)统计数组的和
echo array_sum($arr);
echo &#39;<br/>&#39;;
// 2.array_product(数组)统计数组的乘积 
echo array_product($arr);
echo &#39;<hr/>&#39;;

Array first elements&& last element

reset() first element
end() whether the last element

value is in the set

in_array()

Example

$ext = 'jpg';
$allowExts=['jpg','jpeg','gif','png'];
var_dump(in_array($ext,$allowExts));

Pointer operation related

array_pop(数组)               删除数组最后一个
array_push(数组，添加元素)     数组末尾添加一个
array_shift(数组)             删除数组第一个
array_unshift(数组，添加元素)  数组开头添加一个

Array to string

implode((separator,)array)
join((separator,) )Array)

Example

// 把逗号与数组拼接成系新字符串$str1 = join(',',range(0,9));echo $str1;
拼接数组
array_merge(arr1,arr2,arr3...)
随机输出key
array_rand(数组(,长度))
交换key和value
array_flip()

Example

$arr = ['a','b','c'];
$newArr = array_flip($arr);
var_dump($newArr);
输出结果：
    array (size=3)
      666 => int 0
      'txt' => int 1
      'jpg' => int 2
    )

Statistics related

array_sum(array) The sum of statistical arrays
array_product(array) Statistical array The product

Example

// 已有字符串2，3，4，5，19，39
$str = '2,3,4,5,19,39';
$arr = explode(',',$str);
// 1. array_sum(数组)统计数组的和
echo array_sum($arr);
echo &#39;<br/>&#39;;
// 2.array_product(数组)统计数组的乘积 
echo array_product($arr);
echo &#39;<hr/>&#39;;

The first element of the array && The last element

reset() The first element
end() The last element

Whether the value is in the collection

in_array()

Example

$ext = 'jpg';
$allowExts=['jpg','jpeg ','gif','png'];
var_dump(in_array($ext,$allowExts));

Pointer operation related

array_pop(array)                                                                                                                                                                                                                               ##array_push(array, add element) Add an
array_shift(array) at the end of the array Delete the first one in the array
array_unshift(array, add element) Add an

join((separator,)array)

// 把逗号与数组拼接成系新字符串
$str1 = join(',',range(0,9));
echo $str1;

$arr = ['a','b','c'];
$newArr = array_flip($arr);
var_dump($newArr);
输出结果：
    array (size=3)
      666 => int 0
      'txt' => int 1
      'jpg' => int 2
    )

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