Array product in php

PHP Array Product: A Comprehensive Guide

The PHP array product function is an important tool for any PHP developer to have in their toolkit. It calculates the product of all elements in an array and returns the result. This can be incredibly useful in a variety of situations, such as when working with mathematical operations or when trying to determine the overall value of a set of items.

Understanding the PHP Array Product Function

The PHP array product function takes in an array as its input and calculates the product of all of the elements in that array. This can be incredibly useful in a variety of situations, such as when working with mathematical operations or when trying to determine the overall value of a set of items.

The function works by starting with an initial value of 1 and then multiplying each subsequent element in the array by that value. The end result is the product of all of the elements in the array.

int array_product ( array $array )

How to Use the PHP Array Product Function

Using the PHP array product function is simple. First, you’ll need to create an array that you’d like to calculate the product of. Then, simply pass that array as an argument to the array_product function. The result will be returned to you as an integer.

 $numbers = array(1, 2, 3, 4, 5); $product = array_product($numbers); echo $product; ?>

Potential Pitfalls

It’s important to note that the PHP array product function only works with arrays that contain numeric values. If you try to pass an array that contains non-numeric values, you’ll receive an error. Additionally, if you pass an empty array to the array_product function, the result will be 0.

 $numbers = array("1", "2", "3", "4", "Q"); $product = array_product($numbers); echo $product; ?>

Wrapping Up

The PHP array product function is a useful tool for any PHP developer to have in their toolkit. Whether you’re working with mathematical operations or trying to determine the overall value of a set of items, this function can help you get the job done quickly and efficiently. So, be sure to give it a try the next time you find yourself in need of a quick and accurate way to calculate the product of an array.

Источник

array_product

array_product() возвращает произведение значений массива.

Список параметров

Возвращаемые значения

Возвращает произведение как тип integer или float.

Примеры

Пример #1 Примеры использования array_product()

$a = array( 2 , 4 , 6 , 8 );
echo «product(a) color: #007700″>. array_product ( $a ) . «\n» ;
echo «product(array()) color: #007700″>. array_product (array()) . «\n» ;

Результат выполнения данного примера:

product(a) = 384 product(array()) = 1

User Contributed Notes 7 notes

This function can be used to test if all values in an array of booleans are TRUE.

function outbool ( $test )
return (bool) $test ;
>

$check [] = outbool ( TRUE );
$check [] = outbool ( 1 );
$check [] = outbool ( FALSE );
$check [] = outbool ( 0 );

$result = (bool) array_product ( $check );
// $result is set to FALSE because only two of the four values evaluated to TRUE

?>

The above is equivalent to:

$check1 = outbool ( TRUE );
$check2 = outbool ( 1 );
$check3 = outbool ( FALSE );
$check4 = outbool ( 0 );

?>

This use of array_product is especially useful when testing an indefinite number of booleans and is easy to construct in a loop.

Here’s how you can find a factorial of a any given number with help of range and array_product functions.

function factorial($num) return array_product(range(1, $num));
>

Just a little correction for Andre D’s answer: «(bool) array_product($array);» is equivalent with the conjunction of each array elements of $array, UNLESS the provided array is empty in which case array_product() will return 1, which will translate to boolean TRUE.

To mitigate this, you should expand the function with an additional check:

You can use array_product() to calculate the geometric mean of an array of numbers:

$a = [ 1 , 10 , 100 ];
$geom_avg = pow ( array_product ( $a ), 1 / count ( $a ));
// = 9.999999999999998 ≈ 10
?>

You can use array_product to calculate the factorial of n:
function factorial ( $n )
<
if( $n < 1 ) $n = 1 ;
return array_product ( range ( 1 , $n ));
>
?>

If you need the factorial without having array_product available, here is one:
function factorial ( $n )
<
if( $n < 1 ) $n = 1 ;
for( $p ++; $n ; ) $p *= $n —;
return $p ;
>
?>

array_product() can be used to implement a simple boolean AND search

$args = array( ‘first_name’ => ‘Bill’ , ‘last_name’ => ‘Buzzard’ );
$values [] = array( ‘first_name’ => ‘Brenda’ , ‘last_name’ => ‘Buzzard’ );
$values [] = array( ‘first_name’ => ‘Victor’ , ‘last_name’ => ‘Vulture’ );
$values [] = array( ‘first_name’ => ‘Bill’ , ‘last_name’ => ‘Blue Jay’ );
$values [] = array( ‘first_name’ => ‘Bill’ , ‘last_name’ => ‘Buzzard’ );

$result = search_for ( $values , $args );
var_dump ( $result );exit;

function search_for ( $array , $args ) $results = array();
foreach ( $array as $row ) $found = false ;
$hits = array();
foreach ( $row as $k => $v ) if ( array_key_exists ( $k , $args )) $hits [ $k ] = ( $args [ $k ] == $v );
>

$found = array_product ( $hits );
if (! in_array ( $row , $results ) && true == $found ) $results [] = $row ;
>

array (size=1)
0 =>
array (size=2)
‘first_name’ => string ‘Bill’ (length=4)
‘last_name’ => string ‘Buzzard’ (length=7)

An observation about the _use_ of array_product with primes:

$a=$arrayOfSomePrimes=(2,3,11);
// 2 being the first prime (these days)

$codeNum=array_product($a); // gives 66 (== 2*3*11)

echo «unique product(\$a) = » . array_product($a) . «\n»;

The 66 can (only) be split into its original primes,
which can be transformed into their place in the row of primes (2,3,5,7,11,13,17,19. ) giving (1,2,3,4,5,6,7,8. )

The 66 gives the places in the row of primes. The number «66» is unique as a code for

So you can define the combination of table-columns in «66». The bigger the combination, the more efficient in memory/transmission, the less in calculation.

• Функции для работы с массивами
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  • array_​uintersect
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  • array_​unshift
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  • array_​walk_​recursive
  • array_​walk
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  • key_​exists
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  Источник

  PHP array_product() Function

  The array_product() function calculates and returns the product of an array.

  Syntax

  Parameter Values

  Technical Details

  Return Value:	Returns the product as an integer or float
  PHP Version:	5.1.0+
  Changelog:	As of PHP 5.3.6, the product of an empty array is 1. Before PHP 5.3.6, this function would return 0 for an empty array.

  More Examples

  Example

  Calculate and return the product of an array:

  

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  Источник

  PHP array_product() Function

  $array: It refers to the input array whose products of elements we wish to get.

  Return value

  The array_product() function returns an integer or float value depending on the nature of the elements of the array.

  Example 1: How to Use PHP array_product function

   $arr = array(11, 18, 19, 21, 29); $product = array_product($arr); echo $product;

  As of PHP 5.3.6, the product of an empty array is 1. Before PHP 5.3.6, this function would return 0 for an empty array.

  Example 2: Pass the integral and float values

  When an array passed to the array_product() function contains both integral and float values, then the array_product() function returns a floating-point value equal to the product of all the elements of the array passed to it.

   $arr = array(1.1, 2.1); $product = array_product($arr); echo $product; 

  Example 3: Elements with 0 in array_product()

  If any value in an array is 0, the function will always return 0.

   $arr = array(11, 21, 19, 0, 46, 29); $product = array_product($arr); echo $product; 

  Example 4: Array Elements Containing String

  If any element in the input array is the string, the function will type-case it to 0. That is why it will always return 0 in such a case.

   $arr = array(11, 21, 19, 'Eleven', 46, 29); $product = array_product($arr); echo $product; 

  Example 5: Checking if all the values are boolean true or not

  You can use a function to check whether all the values are true.

   $arr = array(1, 11, 0, true); $product = array_product($arr); echo $product; 

  Источник

  array_product() function in PHP

  The array_product() function calculates the product of the values in an array. It returns the product of values.

  Syntax

  Parameters

  Return

  The array_product() function returns the product of values in the array. The value is returned as integer or float.

  Example

  The following is an example −

  Output

  The following is the output −

  Let us see another example wherein we have a mix of integer and float elements in the array. The resultant product will be float −

  Output

  

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