How to see array size in php

In PHP, we can use the count() function to get the size of the array, that is, the number of elements it contains.

The following is a specific example of using the count() function:

// 声明一个包含5个元素的数组
$myArray = array('apple', 'banana', 'orange', 'grape', 'watermelon');

// 使用count函数得到数组大小
$arraySize = count($myArray);

// 输出数组大小
echo '数组大小为：' . $arraySize . '<br />';

The output result is:

数组大小为：5

In addition to using count()# In addition to the ## function, we can also use the sizeof() function to get the size of the array. These two functions have the same purpose and can be used interchangeably.

// 声明一个包含10个元素的数组
$myArray = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

// 使用sizeof函数得到数组大小
$arraySize = sizeof($myArray);

// 输出数组大小
echo '数组大小为：' . $arraySize . '<br />';

The output result is:

数组大小为：10

It should be noted that if we want to count the number of all elements in a multi-dimensional array, we need to add it when using the

count() function The second parameter COUNT_RECURSIVE indicates recursively counting the number of elements in the subarray.

The following is an example of a multi-dimensional array:

// 定义一个包含子数组的多维数组
$myMultiArray = array(
    'fruits' => array('apple', 'banana', 'orange', 'grape', 'watermelon'),
    'numbers' => array(1, 2, 3, 4, 5),
    'colors' => array('red' => '#FF0000', 'green' => '#00FF00', 'blue' => '#0000FF')
);

// 使用count函数得到多维数组大小
$arraySize = count($myMultiArray, COUNT_RECURSIVE);

// 输出数组大小
echo '数组大小为：' . $arraySize . '<br />';

The output result is:

数组大小为：14

It should be noted that the

count() function, ## The #sizeof() function can only be used for arrays. If we want to count the elements in an object, we need to use other methods, such as through member functions of the class.

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