PHP 5.6.0beta1 released

min

(PHP 4, PHP 5)

minEncontra o menor valor

Descrição

mixed min ( array $values )
mixed min ( mixed $value1 , mixed $value2 [, mixed $value3... ] )

Se o primeiro e único argumento é um array, min() retorna o menor valor no array. Se no mínimo dois parâmetros são fornecidos, min() retornará o menor deles.

Nota:

O PHP irá avaliar uma string não numérica como 0 se comparado a integer, mas ainda retorna a string como se ela fosse numericamente o menor valor. Se vários agumentos forem avaliados como 0, min() irá retornar o menor valor alfanumericamente se alguma string é dada, senão um número 0 é retornado.

Parâmetros

values

Um array contendo os valores.

Valor Retornado

min() retorna o menor numericalmente dos valores dos parâmetros.

Exemplos

Exemplo #1 Exemplos de 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

// Com arrays múltiplos, min compara da esquerda para direita,
// assim nesse exemplo: 2 == 2, mas 4 < 5
$val min(array(248), array(251)); // array(2, 4, 8)

// Se ambos forem um array e um não array, o array
// nunca será retornado porque ele é sempre considerado o maior
$val min('string', array(257), 42);   // string
?>

Veja Também

  • max() - Localiza o maior valor
  • count() - Conta o número de elementos de uma variável, ou propriedades de um objeto

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User Contributed Notes 15 notes

up
7
Anonymous
8 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 !
up
5
php at keith tyler dot com
3 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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4
DO
5 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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2
johnphayes at gmail dot com
7 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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2
alx5000 at walla dot com
9 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
?>
up
2
harmor
6 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
up
1
nonick AT 8027 DOT org
10 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
1
Err
4 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
?>
up
1
hava82 at gmail dot com
2 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) );
}
?>
up
1
Teelevision
6 months 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)));
}
?>
up
1
dave at dtracorp dot com
7 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;
}
up
0
matt at borjawebs dot com
3 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);
?>
up
0
piotr_sobolewski at o2 dot nospampleasenono dot pl
6 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
0
steffen at morkland dot com
8 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 ===
up
-1
browne at bee why you dot ee dee you
10 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);
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