count函數里加函數

PHP count()函數 (PHP count() function)

"count() function" is used to get the total number of elements of an array.

“ count()函數”用于獲取數組元素的總數。

Syntax:

句法：

    count(array, [count_mode])

Here,

這里，

• array is the name of an input array

  array是輸入數組的名稱

• count_mode is an optional parameter and it's default value is 0, it has two values

  count_mode是一個可選參數，默認值為0，它有兩個值

  0 – It does not count all elements of a multidimensional array

  0 –不計算多維數組的所有元素

  1 – It counts all elements of a multidimensional array

  1 –計算多維數組的所有元素

Examples:

例子：

    Input:
$arr1 = array("101", "102", "103", "104", "105");
Output:
arr1 has 5 elements

PHP code: Using single dimensional array

PHP代碼：使用一維數組

<?php    
$arr1 = array("101", "102", "103", "104", "105");
$arr2 = array("Amit", "Abhishek", "Prerana", "Aleesha", "Prem");
$len = count($arr1);
print ("arr1 has $len elements\n");
$len = count($arr2);
print ("arr2 has $len elements\n");	
?>

Output

輸出量

arr1 has 5 elements
arr2 has 5 elements

PHP code: Using multidimensional array

PHP代碼：使用多維數組

<?php    
$students = array(
"101" => array(
"name" => "Amit",
"age" => 21,
),
"102" => array(
"name" => "Abhi",
"age" => 20,
)
);
$len = count($students);
print ("count value = $len (count_mode is not provided)\n");
$len = count($students, 0);
print ("count value = $len (count_mode is set to 0)\n");    
$len = count($students, 1);
print ("count value = $len (count_mode is set to 1)\n");    
?>

Output

輸出量

count value = 2 (count_mode is not provided)
count value = 2 (count_mode is set to 0)
count value = 6 (count_mode is set to 1)

翻譯自: https://www.includehelp.com/php/count-function-with-example.aspx

count函數里加函數