How to get the array length in php

In PHP, there are many ways to obtain the length of an array. Three of them will be introduced below.

Method 1:

Use the count() function

The count() function is used to count the number of elements in the array and the number of attributes in the object.

Syntax:

count(array,mode)

Parameters:

array: required. Specifies the array or Countable object to be counted.

mode: optional. Specify the mode. Possible values ​​are:

0: Default. Arrays are not traversed recursively (only one-dimensional arrays are counted).

1: Recursively count elements in a multidimensional array.

Example:

$arr ​​= array(1,2,3,4,5);

echo count($arr);

Output Result:

5

Method 2:

Use sizeof() function

sizeof() function is an alias of count() function, and its function is also to obtain The length of the array.

Syntax:

sizeof(array,mode)

Like the count() function, it also has an optional mode parameter. The difference is that there are only two values ​​​​1 and 0 in the mode parameter of the sizeof() function.

Example:

$arr ​​= array(1,2,3,4,5);

echo sizeof($arr);

Output Result:

5

Method 3:

Use end() function

end() function is used to move the array pointer to the last element, And returns the value of the element, which can be used with the list() function.

Syntax:

end(array)

Parameters:

array: required. Specifies the array to use.

Example:

$arr ​​= array(1,2,3,4,5);

echo key($arr); //Output 0

end($arr);

echo key($arr); //Output 4

echo key($arr) 1; //Output 5

Note: In the above example, we used the key() function after the end() function to get the key name of the last element, and then 1 can get the length of the array.

To sum up, there are many ways to obtain the length of an array. The key is to choose the most appropriate method according to the specific situation.

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