PHP Ds Vector count()函数用法介绍

2021年3月11日17:03:07 发表评论 832 次浏览

Ds \ Vector :: count()function是PHP中的内置函数, 用于计算向量中的元素数。

语法如下:

int public Ds\Vector::count( void )

参数:该函数不接受任何参数。

返回值:此函数返回向量中元素的数量。

下面的程序说明了Ds \ Vector :: count()PHP中的功能:

程序1:

<?php
  
// Declare a vector 
$arr1 = new \Ds\Vector([1, 2, 3, 4, 5, 6, 7, 8]);
  
echo ( "Vector elements\n" );
  
// Display the vector elements
print_r( $arr1 );
  
echo ( "Count vector elements: " );
  
// Use count() function to count 
// elements in the vector
echo ( count ( $arr1 ));
  
?>

输出如下:

Vector elements
Ds\Vector Object
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
)
Count vector elements: 8

程式2:

<?php
  
// Declare a vector 
$arr1 = new \Ds\Vector([ "geeks" , "for" , "geeks" ]);
  
echo ( "Vector elements\n" );
  
// Display the vector elements
print_r( $arr1 );
  
echo ( "Count vector elements: " );
  
// Use count() function to count 
// elements in the vector
echo ( count ( $arr1 ));
  
?>

输出如下:

Vector elements
Ds\Vector Object
(
    [0] => geeks
    [1] => for
    [2] => geeks
)
Count vector elements: 3

参考: http://php.net/manual/en/ds-vector.count.php


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