How to query the length of an array in php

How to query the length of an array in php: 1. Use the php function "count()" to get the length of the array. The syntax is such as "count($arr);"; 2. Use the "sizeof()" function to get the length of the array. To calculate the length of an array, the syntax is "sizeof($arr);".

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The method to get the length of an array in php is very simple, php does it for us Two functions are provided to calculate the length of a one-dimensional array, such as count and sizeof, which can directly count the length of the array. Let's take a look at a few examples.

How to get the length of an array in php, use the php function count(), or sizeof()

For example:

$arr = Array('0','1','2','3','4'); 
echo count($arr);
// 输出 5
$arr = array('A','B','C');
echo sizeof($arr);
//输出3

sizeof() and count() have the same Purpose, both functions can return the number of array elements. You can get the number of elements in a regular scalar variable. If the array passed to this function is an empty array, or a variable that has not been set, the returned The number of array elements is 0;

The two functions have the same function. According to the manual, sizeof() is an alias of the function count().

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