How to see array length in php

You can use the count() function in PHP to get the length of an array. The count() function is a built-in function used to count the number of elements in an array. You can use the following method to calculate the length of the array:

1. Use the count() function to get the length of the array

The sample code is as follows:

$array = array('apple', 'banana', 'cherry');
$length = count($array);
echo $length; // 输出 3

2. Use the sizeof() function to get the length of the array

The sizeof() function is similar to the count() function and can be used to calculate the length of the array. The two functions have the same effect and are used in the same way. The sample code is as follows:

$array = array('apple', 'banana', 'cherry');
$length = sizeof($array);
echo $length; // 输出 3

3. Use PHP's count() function to get the length of the object attribute

In addition to getting the length of the array, the count() function also Can be used to get the number of object properties. The sample code is as follows:

class Fruit {
    public $name;
    public $color;
    public $price;
}

$fruit = new Fruit;
$fruit->name = 'apple';
$fruit->color = 'red';
$fruit->price = 1.20;

$length = count(get_object_vars($fruit));
echo $length; // 输出 3

In this example, a class named Fruit is first defined, which has three public properties: name, color and price. Then a Fruit object is created and its three properties are assigned values. Finally, the number of attributes of this object is calculated and the results are output to the screen.

4. Use PHP's count() function to get the length of a string

In addition to getting the length of arrays and object properties, the count() function can also be used To get the length of a string. The sample code is as follows:

$string = 'Hello, World!';
$length = count(str_split($string));
echo $length; // 输出 13

In this example, a string named string is first defined and the length of the string is calculated. The str_split() function converts a string into an array, then uses the count() function to calculate the length of the array and outputs the result to the screen.

Conclusion

The above is how to calculate the length of an array in PHP. The count() function is a commonly used array function used to calculate the length of an array. In addition to working with arrays, the count() function can also be used with object properties and strings.

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