Adding numbers in a multidimensional array - php

Question

Is there a faster way to add all the numbers in each segment of the multidimensional array rather than just doing it all manually? I was told before that a foreach loop could be used but I've hit a brick wall.
I'm trying to make it so it shows the total number of course enrollments in each campus and then the total number of students taking each course.
I feel like the answer is staring me in the face but I'm unsure.
<?
$campus = array();
$campus[1]['course1'] = 5; // <---- Number enrolled
$campus[1]['course2'] = 15;
$campus[1]['course3'] = 22;
$campus[1]['course4'] = 21;
$campus[1]['course5'] = 12;
$campus[1]['course6'] = 25;
$campus[1]['course7'] = 16;
$campus[1]['course8'] = 11;
$campus[1]['course9'] = 17;
$campus[1]['course10'] = 23;
$campus[2]['course1'] = 11;
$campus[2]['course2'] = 23;
$campus[2]['course3'] = 51;
$campus[2]['course4'] = 25;
$campus[2]['course5'] = 32;
$campus[2]['course6'] = 35;
$campus[2]['course7'] = 32;
$campus[2]['course8'] = 52;
$campus[2]['course9'] = 25;
$campus[2]['course10'] = 21;
$campus[3]['course1'] = 2;
$campus[3]['course2'] = 12;
$campus[3]['course3'] = 32;
$campus[3]['course4'] = 32;
$campus[3]['course5'] = 25;
$campus[3]['course6'] = 26;
$campus[3]['course7'] = 29;
$campus[3]['course8'] = 12;
$campus[3]['course9'] = 15;
$campus[3]['course10'] = 11;
echo "<pre>";
print_r($campus);
echo "<br/>";
foreach($campus as $key=>$value)
{
}

Answer 1

Use array_sum() to add the numbers in an array, and use array_map() to apply it to each element of the $campus array.
$total_by_campus = array_map('array_sum', $campus);

Answer 2

$courses = array();
foreach($campus as $key=>$value)
{
foreach($value as $course=>$num)
$courses[$course] += $num;
}
var_dump($courses);
Should do it.

Answer 3

You can use PHP's array_sum() function that will add up the values of the array you give it.
<?php
$sum = array_sum($campus[1]);
echo $sum;

Answer 4

$totcount = 0;
$count = array();
foreach($campus as $key=>$value)
{
foreach($value as $value1 => $value2)
{
$count[$value1]+=$value2;
$totcount++;
}
}
print_r($count);
echo "<br><br><br>". $totcount;

Answer 5

take a look:
$campus = array
(
'1' => array
(
'course1' => 5,
'course2' => 15,
'course3' => 22,
'course4' => 21,
'course5' => 12,
'course6' => 25,
'course7' => 16,
'course8' => 11,
'course9' => 17,
'course10' => 23,
),
'2' => array
(
'course1' => 11,
'course2' => 23,
'course3' => 51,
'course4' => 25,
'course5' => 32,
'course6' => 35,
'course7' => 32,
'course8' => 52,
'course9' => 25,
'course10' => 21,
),
'3' => array
(
'course1' => 2,
'course2' => 12,
'course3' => 32,
'course4' => 32,
'course5' => 25,
'course6' => 26,
'course7' => 29,
'course8' => 12,
'course9' => 15,
'course10' => 11,
),
);
foreach ($campus as $key0 => $value0)
{
// $key0 == (1, 2, 3)
// $value0 == array(course1 => 5, course2 => 15, course3 => 22, ...)
foreach ($value0 as $key1 => $value1)
{
// $key1 == (course1, course2, course3, ...)
// $value1 == (5, 15, 22, ...)
}
}
Sorry, but you post a question: "How to check an array's contents to see if they have any numbers?"
<?php
$cowboyfile = "COWBOY.TXT";
$data = array();
$data[] = "Colt Peacemaker, 12.20";
$data[] = "Holster, 2.00";
$data[] = "Levi Strauss Jeans, 1.35";
$data[] = "Saddle, 40.00";
$data[] = "Stetson, 10.00";
// Writing in the File
file_put_contents($cowboyfile, implode("\r\n", $data));
// Displaying all items above $10
$items = file($cowboyfile);
$item_filtred = array();
for ($i = 0; $i < count($items); $i++)
{
$item = $items[$i];
$item_price = substr($items[$i], strpos($item, ',') + 1);
if ($item_price >= 10)
{
$item_filtred[] = $item;
}
}
print_r($item_filtred);