max
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) );
}
?>
min
(PHP 4, PHP 5)
min — 최소값을 찾습니다
설명
단 하나의 인수가 배열로 주어지면, min()은 배열에서 최소값을 반환합니다. 최소한 두 개의 인수가 주어지면, min()은 이 값들 중 최소값을 반환합니다.
Note:
PHP는 수가 아닌 string을 integer로 취급하여 0으로 계산하지만, 수치적으로 최소값일 경우에는 그 문자열을 반환합니다. 복수의 인수가 0으로 계산될 경우, min()은 주어진 문자열 중 가장 낮은 알파벳-숫자 문자열 값을 가지는 문자열을 반환하거나, 숫자 0을 반환합니다.
인수
- values
-
값들을 가지는 배열.
반환값
min()은 수치적으로 가장 낮은 인수 값을 반환합니다.
예제
Example #1 min()의 사용 예제
<?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
// 복수의 배열에서, min은 왼쪽에서 오른쪽으로 비교합니다.
// 예제에서는: 2 == 2, 그리고 4 < 5
$val = min(array(2, 4, 8), array(2, 5, 1)); // array(2, 4, 8)
// 배열과 배열이 아닌 것이 주어지면, 배열은
// 가장 큰 것으로 생각되어 항상 반환되지 않습니다.
$val = min('string', array(2, 5, 7), 42); // string
?>
add a note
User Contributed Notes
min
hava82 at gmail dot com
25-Sep-2011 06:35
php at keith tyler dot com
23-Nov-2010 06:03
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
matt at borjawebs dot com
13-Nov-2010 06:18
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);
?>
Err
04-Oct-2009 10:32
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
?>
andrew dot j dot dodson at gmail
18-Dec-2008 02:10
min/max works with yyyy-mm-dd dates, e.g.
<?php
$a = array( '2008-10-01', '2008-12-01' );
print min($a); // '2008-10-01'
print max($a); // '2008-12-01'
?>
Which is a unexpected since at the top of this page it says.
"PHP will evaluate a non-numeric string as 0"
And if we cast it as an int then we get the year
<?php
print (int)"2008-01-12"; // 2008
?>
ksours at internetbrands dot com
01-Dec-2008 09:07
PHP_INT_MAX is the MAXINT equivalent
mlester at ndsuk dot com
12-Nov-2008 12:59
I have found a very useful trick to help get round the problem of setting a variable to max int when finding a min i.e.
<?php
$val = 10;
$min = 100000; // This is unpleasant and I couldn't find a equivalent to the C++ MAXINT
if ($val < $min)
{
$min = $val;
}
?>
try this ...
<?php
$dataSet = Array(7, 8, 9, -1, -100, 0, 1, 2, 3, 5, 6);
$min = true;
$max = true;
foreach ($dataSet as $data )
{
echo("data = $data");
$min = min($data, $min);
$max = max($data, $max);
}
echo("min = $min");
echo("max = $max");
?>
$max can be set to anything e.g. "infinity", but the same trick doesn't work with min, however true does work (false doesn't). Not sure why though.
The above code even works with a data set like this...
<?php $dataSet = Array("0.5", 1, 2, "3", "-1", "5"); ?>
but min doesn't like null or negative float e.g. "-1.2" and "" can give some odd results too.
DO
02-Jul-2008 09:23
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 $min;
}
?>
harmor
21-Feb-2008 02:58
A way to bound a integer between two values is:
function bound($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
johngreenbury at australianescapes dot com dot au
29-Jan-2008 10:43
You will get an "Wrong parameter count" error (PHP 4 and possibly 5) if your array looks like the following:
min(115.23,432.11,0.00,45.76)
The 0.00 creates the error. Convert the 0.00 to a high number such as 10000000000.00 or remove it from the array before running the min() function.
piotr_sobolewski at o2 dot nospampleasenono dot pl
07-Nov-2007 01:11
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'));
dave at dtracorp dot com
13-Aug-2006 02:30
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;
}
johnphayes at gmail dot com
02-May-2006 03:26
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
steffen at morkland dot com
15-Mar-2006 07:16
> 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 ===
31-Jan-2006 02:37
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 !
DASPRiD d [AT] sprid [DOT] de
06-Jul-2005 12:39
Here is my slightly modified version of the bugfree min-version. Now the max() function is no longer used in the modification and overall it's fasten up. Would be nice to get some feedback.
<?php
function min_mod () {
$args = func_get_args();
if (!count($args)) return false;
else {
$min = false;
foreach ($args AS $value) {
$curval = floatval($value);
if ($curval < $min || $min === false) $min = $curval;
}
}
return $min;
}
?>
alx5000 at walla dot com
12-Jan-2005 10:16
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
?>
nonick AT 8027 DOT org
24-Jan-2004 12:43
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.
browne at bee why you dot ee dee you
16-Dec-2003 07:30
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/$pts_possible,1);
kieran at mgpenguin dot net
18-Jul-2003 02:28
Further modifications to the minnum function above.. This is for a project where I had to grab an entire column out of a database consisting of values that might be string, might be string representations of numbers (floating point or integer) or might be NULL, and find the minimum NUMERIC value:
function minnum($numarray){
//dont use min(), it contains a bug!
$min=0;
if ( ! is_array($numarray) ) $numarray = func_get_args();
if(is_array($numarray)==true){
$min=max($numarray);
for($z=0;$z<count($numarray);$z++){
$curval=floatval($numarray[$z]);
if(($curval != 0) && ($curval < $min)){
$min=$curval;
}
}
}
return $min;
}
Gets the floating point value of each entry and uses this to check whether it's actually a number before checking whether it's the minimum or not. Also contains modifications noted above to use it as a drop in replacement for min - ie multiple values passed.
Merome at wanadoo dot fr
05-Jul-2003 03:40
Caution : it seems that min() can return a string :
min(";",50)=";" (I expected zero)
calin at php9 dot com
30-May-2003 02:19
if you have an array like this
$arSrc[0]=14;
$arSrc[1]=16;
$arSrc[2]=13;
$arSrc[3]=17;
then in order to get the min element and its position in the array you can do:
$iMinValue = min($arSrc);
$arFlip = array_flip($arSrc);
$iMinPosition = $arFlip[$iMinValue];
echo
'<br />min_value=',
$iMinValue,
'<br />min_position=',
$iMinPosition
;
this example works for also for an associative array; of course with numeric values
08-Jul-2002 08:36
Re: above example - for a proper drop in replacement for the above, insert
if ( ! is_array($numarray) )
$numarray = func_get_args();
after
$min=0;
(For PHP3, check
if (intval(PHP_VERSION) >= 4 && ! is_array($numarray))
$numarray = func_get_args();
)
kevin at pricetrak dot com
08-Apr-2002 05:47
The 'undefined' behaviour can bit you badly. I would expect min(undefined, -1000) to return -1000. Not so.
nak2 at mail2000 dot ru
14-Mar-2002 04:36
If one of elements is undefided, min() result is underfinded too