PHP - Manual: min

2024-11-15

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min

(PHP 4, PHP 5, PHP 7, PHP 8)

min — 找出最小值

说明

min(array $values): mixed

min(mixed $value1, mixed $value2, mixed $... = ?): mixed

如果仅有一个参数且为数组，min() 返回该数组中最小的值。如果给出了两个或更多参数, min() 会返回这些值中最小的一个。

注意:
PHP 会将非数值的 string 当成 0，但如果这个正是最小的数值则仍然会返回一个字符串。如果多个参数都求值为 0 且是最小值，min() 会返回按字母表顺序最小的字符串，如果其中没有字符串的话，则返回数值的 0。

参数

values: 包含值的数组。
value1: Any comparable value.
value2: Any comparable value.
...: Any comparable value.

返回值

min() 返回参数中数值最小的。

范例

示例 #1 min() 用法的例子


<?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

// 对多个数组，min 从左向右比较。
// 因此在本例中：2 == 2，但 4 < 5
$val = min(array(2, 4, 8), array(2, 5, 1)); // array(2, 4, 8)

// 如果同时给出数组和非数组作为参数，则不可能返回数组，因为
// 数组被视为最大的
$val = min('string', array(2, 5, 7), 42);   // string
?>

参见

max() - 找出最大值
count() - 统计数组、Countable 对象中所有元素的数量

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User Contributed Notes 17 notes

down

volch5 at gmail dot com ¶

8 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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Teelevision ¶

8 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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Anonymous ¶

16 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 !

down

DO ¶

13 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

harmor ¶

14 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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-3

8ilO ¶

5 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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-3

hava82 at gmail dot com ¶

10 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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-6

php at keith tyler dot com ¶

11 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

piotr_sobolewski at o2 dot nospampleasenono dot pl ¶

14 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'));

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-5

alx5000 at walla dot com ¶

17 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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-5

steffen at morkland dot com ¶

16 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 ===

down

-5

matt at borjawebs dot com ¶

11 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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-5

johnphayes at gmail dot com ¶

16 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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-5

nonick AT 8027 DOT org ¶

18 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.

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-8

Err ¶

12 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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-12

browne at bee why you dot ee dee you ¶

18 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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-14

dave at dtracorp dot com ¶

15 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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官方地址：https://www.php.net/manual/en/function.min.php

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min

说明

参数

返回值

范例

参见

User Contributed Notes 17 notes