PHP array processing function skills analysis

PHP is a popular server-side scripting language that is one of the best choices for working with web pages and servers. In programming, PHP array is a very common data type. It can be used to store and access multiple values, has a simple structure and is easy to use. However, if you don't know how to use PHP array processing functions, then you may encounter a lot of problems during the programming process. Therefore, this article will provide an in-depth analysis of some techniques in PHP array processing functions to help programmers better use PHP arrays.

1. array_push() function

The array_push() function is a commonly used PHP array processing function. It pushes one or more values ​​to the end of the array. This function takes two parameters: the first parameter is the array to which you want to add the values, and the second parameter is the value to be added to the array. For example:

$fruits = array("apple","banana","orange"); 
array_push($fruits,"pear","grape"); //添加元素
print_r($fruits); //输出数组

The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => pear
    [4] => grape
)

2. array_pop() function

array_pop() function is the opposite function to array_push() function. It extracts data from the array Take the last value and remove it from the array. Likewise, this function also takes one parameter, which is the array of values ​​to pop. For example:

$fruits = array("apple","banana","orange"); 
$pop_fruit = array_pop($fruits); //弹出数组元素
print_r($fruits); //输出数组
echo $pop_fruit; //输出被弹出的元素

The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
)
orange

3. array_shift() function

array_shift() function is similar to array_pop() function, it takes out the first one from the array value and remove it from the array. Likewise, this function also takes one parameter, which is the array of values ​​to pop. For example:

$fruits = array("apple","banana","orange"); 
$shift_fruit = array_shift($fruits); //弹出数组元素
print_r($fruits); //输出数组
echo $shift_fruit; //输出被弹出的元素

The output result is as follows:

Array
(
    [0] => banana
    [1] => orange
)
apple

4. array_merge() function

array_merge() function merges two or more arrays into one array. This function takes multiple parameters and can merge two or more arrays. For example:

$arr1 = array("a","b","c"); 
$arr2 = array(1,2,3);
$result = array_merge($arr1,$arr2); //合并数组
print_r($result); //输出数组

The output result is as follows:

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => 1
    [4] => 2
    [5] => 3
)

5. array_unique() function

array_unique() function is used to delete duplicate values ​​from the array and return a new one array. For example:

$fruits = array("apple","banana","orange","banana","pear"); 
$unique_fruits = array_unique($fruits); //删除重复值
print_r($unique_fruits); //输出数组

The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [4] => pear
)

6. count() function

The count() function is used to count the number of elements in the array. For example:

$fruits = array("apple","banana","orange"); 
$count_fruits = count($fruits); //计算数组长度
echo $count_fruits; //输出结果

The output result is as follows:

3

7. sort() function

The sort() function uses the quick sort algorithm to sort the array in ascending order. For example:

$fruits = array("apple","banana","orange"); 
sort($fruits); //升序排序
print_r($fruits); //输出数组

The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
)

8. rsort() function

The rsort() function is the opposite of the sort() function and is used to sort the array in descending order. . For example:

$fruits = array("apple","banana","orange"); 
rsort($fruits); //降序排序
print_r($fruits); //输出数组

The output result is as follows:

Array
(
    [0] => orange
    [1] => banana
    [2] => apple
)

Summary:

This article provides an in-depth analysis of some techniques in PHP array processing functions, including array_push(), array_pop(), array_shift(), array_merge(), array_unique(), count(), sort(), rsort(), etc. I hope these tips can help programmers better use PHP arrays and improve programming efficiency.

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