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PHP array processing function skills analysis

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Release: 2023-06-21 13:36:01
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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
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The output result is as follows:

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

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
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The output result is as follows:

Array
(
    [0] => apple
    [1] => banana
)
orange
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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
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The output result is as follows:

Array
(
    [0] => banana
    [1] => orange
)
apple
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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
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The output result is as follows:

Array
(
    [0] => a
    [1] => b
    [2] => c
    [3] => 1
    [4] => 2
    [5] => 3
)
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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
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The output result is as follows:

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

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
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The output result is as follows:

3
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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
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The output result is as follows:

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

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
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The output result is as follows:

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

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.

The above is the detailed content of PHP array processing function skills analysis. For more information, please follow other related articles on the PHP Chinese website!

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