log
This is highly ineficient, but can be a bit better
<?
function doublemax($mylist){
$maxvalue=max($mylist);
while(list($key,$value)=each($mylist)){
if($value==$maxvalue)
return array("key"=>$key,"value"=>$value);
}
}
?>
max
(PHP 4, PHP 5)
max — Maximalwert bestimmen
Beschreibung
Ist der erste und einzige Parameter ist ein Array, gibt max() den höchsten Wert dieses Arrays zurück. Sind mindestens zwei Parameter übergeben, gibt max() den größeren dieser Werte zurück.
Hinweis:
PHP evaluiert nicht-numerische string-Daten zu 0, wenn sie mit einem integer-Wert verglichen werden, gibt aber trotzdem die Zeichenkette zurück, wenn sie den numerisch höheren Wert hat. Werden mehrere Argumente zu 0 evaluiert, gibt max() den numerischen Wert 0, sofern er übergeben wurde, andernfalls den alphabetisch höchstwertigen String.
Parameter-Liste
- values
-
Ein die Werte enthaltendes Array.
Rückgabewerte
max() liefert den numerisch größten Parameterwert zurück.
Beispiele
Beispiel #1 Verwendungsbeispiel von max()
<?php
echo max(1, 3, 5, 6, 7); // 7
echo max(array(2, 4, 5)); // 5
echo max(0, 'hello'); // 0
echo max('hello', 0); // hello
echo max(-1, 'hello'); // hello
// Bei multiplen Arrays vergleicht max von links nach rechts,
// daher ist in unserem Beispiel 2 == 2, aber 4 < 5
$val = max(array(2, 4, 8), array(2, 5, 7)); // array(2, 5, 7)
// Sind ein Array und ein Nicht-Array-Parameter gegeben, wird immer
// das Array als größerer Wert angesehen
$val = max('string', array(2, 5, 7), 42); // array(2, 5, 7)
?>
add a note
User Contributed Notesmax
joan dot codina at upf dot edu
14-Jul-2007 07:11
14-Jul-2007 07:11
michaelangel0 at mail.com
05-Jul-2007 12:00
05-Jul-2007 12:00
Matlab users and others may feel lonely without the double argument output from min and max functions.
To have the INDEX of the highest value in an array, as well as the value itself, use the following, or a derivative:
<?
function doublemax($mylist){
$maxvalue=max($mylist);
while(list($key,$value)=each($mylist)){
if($value==$maxvalue)$maxindex=$key;
}
return array("m"=>$maxvalue,"i"=>$maxindex);
}
?>
jeremi23 at gmail dot com
14-Jun-2007 12:09
14-Jun-2007 12:09
max on a an array with key/values
<?
$tmp = array(1 => 5, 2=> 3);
echo max($tmp);
?>
this return 5, so the max is done on the values.
johnmott59 at hotmail dot com
17-May-2007 09:35
17-May-2007 09:35
To find the maximum value from a set of 1-dimensional arrays, do this:
$d1 = array(450,420,440,430,421);
$d2 = array(460,410,410,430,413,375,256,411,656);
$d3 = array(430,440,470,435,434,255,198);
$t = max(max($d1),max($d2),max($d3));
// $t is 656
The inner max() functions operate on the arrays, the outer max compares the numeric results of the inner ones.
johnphayes at gmail dot com
02-May-2006 06:27
02-May-2006 06:27
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
tim at (NOSPAM) dot crazynot2 dot com
08-Nov-2005 10:56
08-Nov-2005 10:56
In response to the previous two posters (zher0 at netcarrier dot com & walkingmantis):
I was trying to do exactly what zher0 suggested; calculate the max value of a multi-dimensional array with variably sized 'sub-arrays'. Here is a simple little function I came up with to do just that:
<?php
function multimax( $array ) {
// use foreach to iterate over our input array.
foreach( $array as $value ) {
// check if $value is an array...
if( is_array($value) ) {
// ... $value is an array so recursively pass it into multimax() to
// determine it's highest value.
$subvalue = multimax($value);
// if the returned $subvalue is greater than our current highest value,
// set it as our $return value.
if( $subvalue > $return ) {
$return = $subvalue;
}
} elseif($value > $return) {
// ... $value is not an array so set the return variable if it's greater
// than our highest value so far.
$return = $value;
}
}
// return (what should be) the highest value from any dimension.
return $return;
}
?>
Please note that I have only performed very limited testing on this code -- be sure to check it thoroughly if you implement it somewhere!
nonick AT 8027 DOT org
17-Dec-2003 04:50
17-Dec-2003 04:50
If you are working with numbers, then you can use:
$a = ($b > $c) ? $b : $c;
which is somewhat faster (roughly 16%) than
$a = max($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.
mikhail_kovalev at mail dot ru
14-May-2003 01:32
14-May-2003 01:32
Note that in version 4.0.3 (the only version I tested):
max (0, 0); // returns 0.
max (0, false); // returns 0.
max (false, 0); // returns false.
max (false, false); // returns false.
As a solution use this:
(int) max (false, 0); // returns 0.
(int) max (false, false); // returns 0.