PHP count() 函数

Συνάρτησεις μαζικών καταχωρήσεων PHP

Example

Returns the number of elements in an array:

<?php
$cars=array("Volvo","BMW","Toyota");
echo count($cars);
?>

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Definition and Usage

The count() function returns the number of elements in an array.

Syntax

count(array,mode);
Parameter Description
array Required. Specifies the array.
mode

Optional. Specifies the mode. Possible values:

  • 0 - Default. Do not count all elements in a multidimensional array
  • 1 - Recursively count the number of elements in an array (count all elements in a multidimensional array)

Description

The count() function calculates the number of elements in an array or the number of properties in an object.

For arrays, returns the number of elements, for other values, returns 1. If the parameter is a variable and the variable is not defined, it returns 0.

If mode If set to COUNT_RECURSIVE (or 1), it will recursively calculate the number of elements in arrays within multidimensional arrays.

Technical Details

Return Value: Returns the number of elements in an array.
PHP Version: 4+
Update Log: mode The parameter was added in PHP 4.2.

More Examples

Example 1

Count arrays recursively:

<?php
$cars=array
  (
  "Volvo"=>array
  (
  "XC60",
  "XC90"
  ),
  "BMW"=>array
  (
  "X3",
  "X5"
  ),
  "Toyota"=>array
  (
  "Highlander"
  )
  );
echo "Normal Count: " . count($cars)."<br>";
echo "Recursive Count: " . count($cars,1);
?>

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Συνάρτησεις μαζικών καταχωρήσεων PHP