how to get maximum value from array php - php

Question

How can I get the maximum distance from the array below? I am getting the following output when i try to print_r($data):
Array
(
[0] => Array
(
[distance] => 1.7 km
[time] => 3 mins
[distance_value] => 1720
[time_value] => 192
)
[1] => Array
(
[distance] => 4.2 km
[time] => 10 mins
[distance_value] => 4207
[time_value] => 587
)
)
I want to echo 4.2 km because it is the max distance in my array.
foreach ($delivery as $key => $value) {
if($key==0) {
$mysource = $pickup;
} else {
$mysource = $delivery[$key-1];
}
$data[$key] = $this->GetDrivingDistance($mysource,$value);
if(!empty($data[$key])) {
$dist += max($data[$key]['distance']);
}
}
echo $dist; exit();
print_r($data); exit();

Answer 1

You can make use of built-in functions:
echo max(array_map('floatval',array_column($array, "distance")))." km";
Explanation:
array_column - converts your array to single dimensional
array_map - Apply float operation to the string. This is important since your string comparison compares two numbers wrongly. When float function is applied your km will be removed, so append later on.
Example for string:
11.7 is less than 4.2, because it compares first character and arranges by 1,2,3...
Output:
4.2 km
Note:
This is suitable if all values are in km,if it is in other units, you need a workaround too!

Answer 2

<?php
$array = array
(
array
(
"distance" => "1.7 km",
"time" => "3 mins",
"distance_value" => 1720,
"time_value" => 192,
),
array
(
"distance" => "4.2 km",
"time" => "10 mins",
"distance_value" => 4207,
"time_value" => 587,
)
);
$distance = [];
$i = 0;
foreach ($array as $distance_data) {
$distance[] = (float)$distance_data["distance"];
$i++;
}
$max_distnace = max($distance);
var_dump($max_distnace);

Answer 3

You can first sort the array by distance and get the required one:
$myArray =
array (
array
(
'distance' => '1.7 km',
'time' => '3 mins',
'distance_value' => 1720,
'time_value' => 192,
),
array
(
'distance' => '4.2 km',
'time' => '10 mins',
'distance_value' => 4207,
'time_value' => 587,
)
);
usort($myArray,function($a, $b) {
return $b['distance_value'] - $a['distance_value'];
});
$maxDistance = $myArray[0];
echo $maxDistance['distance'];
// 4.2 km

Answer 4

I get solution from below code..
foreach ($delivery as $key => $value) {
if($key==0){
$mysource = $pickup;
}else{
$mysource = $delivery[$key-1];
}
$data[$key] = $this->GetDrivingDistance($mysource,$value);
if(!empty($data[$key])){
$max = '-9999999 km'; //will hold max val
$found_item = null; //will hold item with max val;
foreach($data as $k=>$v)
{
if($v['distance']>$max)
{
$max = $v['distance'];
$found_item = $v;
}
}
}
}
$dist = $max;

Answer 5

Thamilan's answer is the best, but as you're using CakePHP you can also use Hash::extract() if array_column() isn't available to you (i.e. you're using an older version of PHP) or if you need to use an array with deeper associations thanks to the Hash utility's path syntax:-
echo max(array_map('floatval', Hash::extract($array, 'distance'))) . ' km';
Here Hash::extract() is working like array_column() and converting your array to a single dimensional array.

Answer 6

Sine this questions is tagged with CakePHP I though I'd give my solution using CakePHP Collection class:
use Cake\Collection\Collection;
(new Collection($data))->sortBy('distance_value')->first()['distance'];
Note that CakePHP has a utility function collection that can make this shorter:
collection($data)->sortBy('distance_value')->first()['distance']