How to output the length of an array in php

In PHP, you can use the count() function to get the length of an array or the number of elements. The count() function can be applied to all types of arrays, such as associative arrays, indexed arrays, and multidimensional arrays.

The following are several methods to demonstrate how to get the length of an array in PHP:

Method 1: Use the count() function
This is the most commonly used method to get the length of an array, through This method can obtain the length of standard indexed arrays, associative arrays, and multidimensional arrays.

For example:

$fruits = array("apple", "banana", "orange");
$count = count($fruits);
echo "数组的长度为：$count";

Output: The length of the array is: 3

Method 2: Use the sizeof() function
sizeof() function is similar to the count() function , can also be used to get the length of an array.

For example:

$fruits = array("apple", "banana", "orange");
$length = sizeof($fruits);
echo "数组的长度为：$length";

Output: The length of the array is: 3

Method 3: Use strlen() function
strlen() function is usually used to obtain strings length, but can also be used to get the length of a string array.

For example:

$fruits = "apple,banana,orange";
$length = strlen($fruits);
echo "数组的长度为：$length";

Output: The length of the array is: 17

If this method is applied to a multidimensional array, it will return a warning and return 1.

Method 4: Use array_length() function
array_length() function is a newly added function in PHP 7, which can be used to get the length of an array.

For example:

$fruits = array("apple", "banana", "orange");
$length = array_length($fruits);
echo "数组的长度为：$length";

Output: The length of the array is: 3

It should be noted that the array_length() function can only be used in PHP 7 and above.

To sum up, the above are four ways to get the length of an array in PHP. Depending on your needs, you can choose which method to use.

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