Get the minimum value of an associative array - php

Question

I need to get the minimum value of this array.
I am using array_maps and running it with for and can't find what I want.
$des['PICO']['new'] = 98;
$des['PICO']['old'] = 100;
$des['ALTO']['new'] = 101;
$des['ALTO']['old'] = 110;
$des['BAI']['new'] = 96;
$des['BAI']['old'] = 102;
$min_new = null;
$min_old = null;
$min_key = null;
foreach($des as $key => $value){
if($min_new < $value['new']){
$min_new = $value['new'];
$min_old = $value['old'];
$min_key = $key;
}
}

Answer 1

The main problem is that you are starting your min value at null. This will mean that none of the values are less than that. So start it at the highest int and only store the key value for use later...
$min_new = PHP_INT_MAX;
$min_key = null;
foreach($des as $key => $value){
if($min_new > $value['new']){
$min_new = $value['new'];
$min_key = $key;
}
}
print_r($des[$min_key]);

Answer 2

<?php
$des['PICO']['new'] = 98;
$des['PICO']['old'] = 100;
$des['ALTO']['new'] = 101;
$des['ALTO']['old'] = 110;
$des['BAI']['new'] = 96;
$des['BAI']['old'] = 102;
$min_new = PHP_INT_MAX;
$min_old = PHP_INT_MAX;
$min_key = PHP_INT_MAX;
foreach($des as $key => $value){
if($min_new > $value['new']){
$min_new = $value['new'];
}
if($min_old > $value['old']){
$min_old = $value['old'];
}
if($min_key > $min_new ){
$min_key = $min_new;
}
if($min_key > $min_old ){
$min_key = $min_old;
}
}
echo "n=". $min_new . " o=" . $min_old . " k=" . $min_key;
?>
or
foreach($des as $key => $value){
if($min_new > $value['new']){
$min_new = $value['new'];
$min_key = $key;
}
if($min_old > $value['old']){
$min_old = $value['old'];
$min_key = $key;
}
}
echo "n=". $min_new . " o=" . $min_old . " k=" . $min_key;
Output:
n=96 o=100 k=BAI