What are the commonly used functions for php arrays?

PHP array commonly used functions include count() function, array_push() function, array_pop() function, array_shift() function, array_unshift() function, array_slice() function, array_merge() function, array_reverse() function , sort() function and rsort() function. Detailed introduction: 1. count() function, etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a scripting language widely used in website development, and arrays are one of the commonly used data structures in PHP. Arrays are used to store a set of related data, and the elements can be accessed by index or key value. In PHP, there are many commonly used array functions that can operate and process arrays. In this article, we will introduce some commonly used functions for PHP arrays.

1. count(): This function is used to count the number of elements in the array and return the result. For example:

$arr=array(1,2,3,4,5);
echocount($arr);//输出5

2. array_push(): This function is used to add one or more elements to the end of the array and return the length of the new array. For example:

$arr=array(1,2,3);
array_push($arr,4,5);
print_r($arr);//输出Array([0]=>1[1]=>2[2]=>3[3]=>4
[4]=>5)

3. array_pop(): This function is used to delete the last element in the array and return the value of the deleted element. For example:

$arr=array(1,2,3);
$lastElement=array_pop($arr);
echo$lastElement;//输出3

4. array_shift(): This function is used to delete the first element in the array and return the value of the deleted element. For example:

$arr=array(1,2,3);
$firstElement=array_shift($arr);
echo$firstElement;//输出1

5. array_unshift(): This function is used to add one or more elements to the beginning of the array and return the length of the new array. For example:

$arr=array(1,2,3);
array_unshift($arr,0);
print_r($arr);//输出Array([0]=>0[1]=>1[2]=>2[3]=>3
)

6. array_slice(): This function is used to remove a continuous element from the array and return a new array. For example:

$arr=array(1,2,3,4,5);
$slice=array_slice($arr,2,2);
print_r($slice);//输出Array([0]=>3[1]=>4)

7. array_merge(): This function is used to merge two or more arrays into a new array and return the result. For example:

$arr1=array(1,2,3);
$arr2=array(4,5);
$result=array_merge($arr1,$arr2);
print_r($result);//输出Array([0]=>1[1]=>2[2]=>3[3]=>
4[4]=>5)

8. array_reverse(): This function is used to arrange the elements in the array in reverse order and return a new array. For example:

$arr=array(1,2,3);
$reversed=array_reverse($arr);
print_r($reversed);//输出Array([0]=>3[1]=>2[2]=>1)

9. sort(): This function is used to sort the elements in the array in ascending order. For example:

$arr=array(3,1,2);
sort($arr);
print_r($arr);//输出Array([0]=>1[1]=>2[2]=>3)

10. rsort(): This function is used to sort the elements in the array in descending order. For example:

$arr=array(1,3,2);
rsort($arr);
print_r($arr);//输出Array([0]=>3[1]=>2[2]=>1)

These functions are only a small part of the commonly used PHP arrays, and there are many other functions that can be selected and used according to actual needs. Understanding the functions and usage of these array functions can help you process and operate array data in PHP more efficiently. .

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