How to get the minimum value from array row - php

Question

I trying to get the minimum values from the any column contains "xx" in the column name.
Below is my code:
<?php
$array = array(
array(
'id' => 1,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
foreach($array as $item)
{
$lowestKey = '';
foreach($item as $key => $value)
{
if(strpos($key, 'xx') === 0)
{
if($lowestKey == '')
{
$lowestKey = $key;
}
else
{
if($value < $item[$lowestKey])
{
$lowestKey = $key;
}
}
}
}
echo 'lowest for id ' . $item['id'] . ': ' . $item[$lowestKey] . "\n";
}
?>

Answer 1

You have a function already for it:
http://php.net/manual/en/function.min.php
echo min(2, 3, 1, 6, 7); // 1
echo min(array(2, 4, 5)); // 2
echo min(0, 'hello'); // 0
echo min('hello', 0); // hello
echo min('hello', -1); // -1
Combine it with array_values if this fits better your needs.

Answer 2

function _getNumber($array) {
return $array['id'];
}
$numbers = array_map('_getNumber', $array);
OR
$numbers = array_map(function($array) {
return $array['id'];
}, $array);
echo $min = min($numbers);
echo $max = max($numbers);

Answer 3

function find_lowest($array){
$new_array = array();
foreach($array as $key => $val ){
if(is_array($val)){
$new_array[$key] = find_lowest($val);
}else{
$new_array[$key] = $val ;
}
}
return min($new_array);
}
$array = array( array( 'id' => 1,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
echo find_lowest($array);

Answer 4

Instead of looping again inside just use the min() function.
$lowest_keys = array();
foreach($array as $item)
{
unset( $item[ 'id' ] );
$lowest_keys[] = min( $item );
}

Answer 5

Iterate each row/subarray with a foreach() loop or array_walk().
Extract and display the id (first element) value with array_shift().
Call min() on the remaining values in the respective subarray to determine the lowest value.
No conditional expressions. No unnecessary variables. Clean, concise, and effective.
Code: (Demo)
$array = [
['id' => 1, '10xx' => 14, '11xx' => 32, '12xx' => 4],
['id' => 2, '10xx' => 13, '11xx' => 36, '12xx' => 41]
];
array_walk($array, function($row) {
echo array_shift($row) , " : " , min($row) , "\n";
});
Output:
1 : 4
2 : 13

Answer 6

$array = array(
array(
'id' => 14,
'10xx' => 14,
'11xx' => 32,
'12xx' => 4
),
array(
'id' => 2,
'10xx' => 13,
'11xx' => 36,
'12xx' => 41
)
);
$lowestKey = '';
foreach($array as $arra){
foreach ($arra as $key=>$value){
if ($key == 'id'){
if(($value < $lowestKey )||( $lowestKey== '')){
$lowestKey = $value;
}
}
}
}
echo $lowestKey;