PHP sizeof()函数与示例
PHPsizeof()函数
sizeof()函数是count()函数的别名，用于获取数组元素的总数。
语法：
sizeof(array, [count_mode])
这里，
array是输入数组的名称
count_mode是一个可选参数，默认值为0，它具有两个值
0–不对多维数组的
所有元素进行计数1–对多维数组的所有元素进行计数
例子：
Input:
$arr1 = array("101", "102", "103", "104", "105");
Output:
arr1 has 5 elementsPHP代码：使用一维数组
<?php
$arr1 = array("101", "102", "103", "104", "105");
$arr2 = array("Amit", "Abhishek", "Prerana", "Aleesha", "Prem");
$len = sizeof($arr1);
print ("arr1 has $len elements\n");
$len = sizeof($arr2);
print ("arr2 has $len elements\n");
?>输出结果
arr1 has 5 elements arr2 has 5 elements
PHP代码：使用多维数组
<?php
$students = array(
"101" => array(
"name" => "Amit",
"age" => 21,
),
"102" => array(
"name" => "Abhi",
"age" => 20,
)
);
$len = sizeof($students);
print ("sizeof value = $len (sizeof_mode is not provided)\n");
$len = sizeof($students, 0);
print ("sizeof value = $len (sizeof_mode is set to 0)\n");
$len = sizeof($students, 1);
print ("sizeof value = $len (sizeof_mode is set to 1)\n");
?>输出结果
sizeof value = 2 (sizeof_mode is not provided) sizeof value = 2 (sizeof_mode is set to 0) sizeof value = 6 (sizeof_mode is set to 1)