min

(PHP 4, PHP 5, PHP 7)

minZnajduje najmniejszą wartość

Opis

min ( number $arg1 , number $arg2 [, number $... ] ) : mixed
min ( array $liczby ) : mixed

min() zwraca najmniejszą liczbę spośród podanych argumentów.

Jeśli pierwszym i jedynym argumentem funkcji jest tablica, zwrócona zostanie najmniejsza wartość z tej tablicy. Jeśli pierwszym argumentem jest liczba stałoprzecinkowa, ciąg znakowy lub liczba zmiennoprzecinkowa, należy podać przynajmniej dwa argumenty, a min() zwróci najmniejszy z nich. Można porównywać nieograniczoną ilość wartości.

Informacja:

PHP będzie uznawał nieliczbowe wartości typu string jako 0, jednakże zwracany będzie ciąg znakowy, jesli zostanie on oznany numerycznie za najmniejszą wartość. Jeśli wiele argumentów zostanie uznanych za wartość 0, to min() zwróci wartość najmniejszą alfanumerycznie, jeśli zostały podane jakiekolwiek ciągi znakowe. W przeciwnym przypadku zwrócona zostanie wartość 0.

Przykład #1 Przykłady użycia min()

<?php
echo min(23167);  // 1
echo min(array(245)); // 2
echo min(0'hello');     // 0
echo min('hello'0);     // hello
echo min('hello', -1);    // -1

// W przypadku podania wielu tablic, min porównuje je od lewej do prawej, 
// A więc w poniższym przykładzie 2 == 2, ale 4 < 5
$val min(array(248), array(251)); // array(2, 4, 8)

// Jeśli podane zostaną tablice i nie-tablice, nigdy nie jest zwracana
// tablica, jako że zawsze jest uznawana za element największy
$val min('string', array(257), 42);   // string

?>

Patrz także: max() i count().

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User Contributed Notes 17 notes

up
6
volch5 at gmail dot com
9 years ago
min() (and max()) on DateTime objects compares them like dates (with timezone info) and returns DateTime object.
<?php
$dt1
= new DateTime('2014-05-07 18:53', new DateTimeZone('Europe/Kiev'));
$dt2 = new DateTime('2014-05-07 16:53', new DateTimeZone('UTC'));
echo
max($dt1,$dt2)->format(DateTime::RFC3339) . PHP_EOL; // 2014-05-07T16:53:00+00:00
echo min($dt1,$dt2)->format(DateTime::RFC3339) . PHP_EOL; // 2014-05-07T18:53:00+03:00
?>

It works at least 5.3.3-7+squeeze17
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4
Teelevision
10 years ago
A function that returns the lowest integer that is not 0.
<?php
/* like min(), but casts to int and ignores 0 */
function min_not_null(Array $values) {
    return
min(array_diff(array_map('intval', $values), array(0)));
}
?>
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1
Anonymous
18 years ago
NEVER EVER use this function with boolean variables !!!
Or you'll get something like this: min(true, 1, -2) == true;

Just because of:
min(true, 1, -2) == min(min(true,1), -2) == min(true, -2) == true;

You are warned !
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0
DO
15 years ago
I've modified the bugfree min-version to ignore NULL values (else it returns 0).

<?php
function min_mod () {
 
$args = func_get_args();

  if (!
count($args[0])) return false;
  else {
   
$min = false;
    foreach (
$args[0] AS $value) {
      if (
is_numeric($value)) {
       
$curval = floatval($value);
        if (
$curval < $min || $min === false) $min = $curval;
      }
    }
  }

  return
$min;  
}
?>
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-1
harmor
16 years ago
A way to bound a integer between two values is:

function bound($x, $min, $max)
{
     return min(max($x, $min), $max);
}

which is the same as:

$tmp = $x;
if($tmp < $min)
{
    $tmp = $min;
}
if($tmp > $max)
{
     $tmp = $max;
}
$y = $tmp;

So if you wanted to bound an integer between 1 and 12 for example:

Input:
$x = 0;
echo bound(0, 1, 12).'<br />';
$x = 1;
echo bound($x, 1, 12).'<br />';
$x = 6;
echo bound($x, 1, 12).'<br />';
$x = 12;
echo bound($x, 1, 12).'<br />';
$x = 13;
echo bound($x, 1, 12).'<br />';

Output:
1
1
6
12
12
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-2
8ilO
7 years ago
A min_by function:
<?php
function min_by(Array $arr, Callable $func){
   
$mapped = array_map($func, $arr);
    return
$arr[array_search(min($mapped), $mapped)];
}
$a = ["albatross""dog""horse"];
echo
min_by($a, "strlen"); // dog
?>
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-2
hava82 at gmail dot com
12 years ago
Here is function can find min by array key

<?php
function min_by_key($arr, $key){
   
$min = array();
    foreach (
$arr as $val) {
        if (!isset(
$val[$key]) and is_array($val)) {
           
$min2 = min_by_key($val, $key);
           
$min[$min2] = 1;
        } elseif (!isset(
$val[$key]) and !is_array($val)) {
            return
false;
        } elseif (isset(
$val[$key])) {
           
$min[$val[$key]] = 1;
        }
    }
    return
min( array_keys($min) );
}
?>
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-4
php at keith tyler dot com
13 years ago
If NAN is the first argument to min(), the second argument will always be returned.

If NAN is the second argument, NAN will always be returned.

The relationship is the same but inverted for max().

<?php
// \n's skipped for brevity
print max(0,NAN);
print
max(NAN,0);
print
min(0,NAN);
print
min(NAN,0);
?>

Returns:
0
NAN
NAN
0
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-3
alx5000 at walla dot com
19 years ago
If you want min to return zero (0) when comparing to a string, try this:

<?php
min
(3,4,";");  // ";"
min(0,min(3,4,";")) // 0
?>
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-3
piotr_sobolewski at o2 dot nospampleasenono dot pl
16 years ago
Be very careful when your array contains both strings and numbers. This code works strange (even though explainable) way:
var_dump(max('25.1.1', '222', '99'));
var_dump(max('2.1.1', '222', '99'));
up
-4
steffen at morkland dot com
18 years ago
> NEVER EVER use this function with boolean variables !!!
> Or you'll get something like this: min(true, 1, -2) == true;

> Just because of:
> min(true, 1, -2) == min(min(true,1), -2) == min(true, -2) == true;

It is possible to use it with booleans, there is is just one thing, which you need to keep in mind, when evaluating using the non strict comparison (==) anyting that is not bool false, 0 or NULL is consideret true eg.:
(5 == true) = true;
(0 == true) = false;
true is also actually anything else then 0, false and null. However when true is converted to a string or interger true == 1, therefore when sorting true = 1. But if true is the maximum number bool true is returned. so to be sure, if you only want to match if true is the max number remember to use the strict comparison operater ===
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-4
matt at borjawebs dot com
13 years ago
A condensed version (and possible application) of returning an array of array keys containing the same minimum value:

<?php
// data
$min_keys = array();
$player_score_totals = array(
'player1' => 300,
'player2' => 301,
'player3' => 302,
'player4' => 301,
...
);

// search for array keys with min() value
foreach($player_score_totals as $playerid => $score)
    if(
$score == min($player_score_totals)) array_push($min_keys, $playerid);

print_r($min_keys);
?>
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-4
johnphayes at gmail dot com
17 years ago
Regarding boolean parameters in min() and max():

(a) If any of your parameters is boolean, max and min will cast the rest of them to boolean to do the comparison.
(b) true > false
(c) However, max and min will return the actual parameter value that wins the comparison (not the cast).

Here's some test cases to illustrate:

1.  max(true,100)=true
2.  max(true,0)=true
3.  max(100,true)=100
4.  max(false,100)=100
5.  max(100,false)=100
6.  min(true,100)=true
7.  min(true,0)=0
8.  min(100,true)=100
9.  min(false,100)=false
10. min(100,false)=false
11. min(true,false)=false
12. max(true,false)=true
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-4
nonick AT 8027 DOT org
20 years ago
I tested this with max(), but I suppose it applies to min() too: If you are working with numbers, then you can use:

    $a = ($b < $c) ? $b : $c;

which is somewhat faster (roughly 16%) than

    $a = min($b, $c);

I tested this on several loops using integers and floats, over 1 million iterations.

I'm running PHP 4.3.1 as a module for Apache 1.3.27.
up
-7
Err
14 years ago
When using a variable with an array that has a list of numbers, put just the variable in min(). Don't use integer index's. Seems pretty straight forward now, but I wasn't used to just putting down the variable for an array in functions.

<?php
  $list
= array(9,5,4,6,2,7);
  echo
min($list); // display 2
?>
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-11
browne at bee why you dot ee dee you
20 years ago
min() can be used to cap values at a specific value. For instance, if you're grading papers and someone has some extra credit, but  that shouldn't make it to the final score:

$pts_possible = 50;
$score = 55;

// Percent will equal 1 if $score/$pts_possible is greater than 1
$percent = min($score/$pts_possible,1);
up
-13
dave at dtracorp dot com
17 years ago
empty strings '' will also return false or 0, so if you have something like

$test = array('', 1, 5, 8, 44, 22);

'' will be returned as the lowest value

if you only want to get the lowest number, you'll have to resort to the old fashioned loop

// default minimum value
$minVal = 100;
foreach ($test as $value) {
if (is_numeric($value) && $value < $minVal) {
$minVal = $value;
}
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