[SOLVED] array max location

[asmith]

can i find a max in array , and find what key it is  ?  and find duplicated values ? ?

 

like :

 

$a = array ( 1 ,4,6,3,6,1,6);

 

can find that the max of the array is  6  , and it is located in  a[2] , a[4], a[6]  ??

thanks

[Aureole]

max()

[asmith]

come again ?

 

 

the output of max for that code is

max($a) =  6 ;

 

 

how to locate the duplicate and where is it ?

[PHP_PhREEEk]

Use the result of max() as the argument for in_array to find them all...

 

PhREEEk

[asmith]

mm i search the php.net for in_array  , found nothing special there , but i found  array_search function .

with array search i can find its key , but it shows the first one for duplicate values !

any idea ? 

 

 

<?php

$a= array(1,5,7,8,8,;

$b = array_search(8,$a);

echo $b;

?>

 

the code echos 3 . 

 

[kenrbnsn]

I don't believe there is a built-in function to do what you want, you can write one:

<?php
function get_maxs($ary) {
  $max = max($ary);
  $tmp = array();
  for ($i=0;$i<count($ary);$i++)
     if ($ary[$i] == $max) $tmp[] = $i;
  return ($tmp);
}

$test = array(1,5,3,6,3,6,8,6,6,6);
echo '<pre>' . print_r(get_maxs($test,true)) . '</pre>';
?>

 

Ken

[PHP_PhREEEk]

Let's try a loop...

 

<?php
$a = array ( 1, 4, 6, 3, 6, 1, 6 );
echo "<pre>";
print_r($a);
echo "</pre><br>";
$arrayMax = max($a);
$found = array();
foreach ( $a as $key => $value ) {
   if ( $value == $arrayMax ) {
       $found[$key] = $value;
   }
}
echo 'I found the largest value was ' . $arrayMax . ', and it appeared in the following keys of $a[]:<br>';
foreach ( $found as $key => $value ) {
   echo $key . ' => ' . $value . '<br>';
}

 

Output:

 

Array
(
   [0] => 1
   [1] => 4
   [2] => 6
   [3] => 3
   [4] => 6
   [5] => 1
   [6] => 6
)


I found the largest value was 6, and it appeared in the following keys of $a[]:
2 => 6
4 => 6
6 => 6

 

PhREEEk

[kenrbnsn]

Here's my fixed function:

<?php
function get_maxs($ary) {
  print_r($ary);
  $max = max($ary);
  $tmp = array();
  for ($i=0;$i<count($ary);$i++) {
     if ($ary[$i] == $max) {
        $tmp[] = $i;
        echo $i . ' ... ' . $ary[$i] . ' ... ' . $max . "\n";
        }
  }
  return ($tmp);
}

$test = array(1,5,3,6,3,6,5,6,6,6);
$x = get_maxs($test);
echo '<pre>' . print_r($x,true) . '</pre>';
?>

 

Ken

[asmith]

thanks , it works,

yo know my main problem cause from this topic  :

http://www.phpfreaks.com/forums/index.php/topic,173620.0.html

 

 

as i couldn't solve it , i'm trying to get around it .

thanks for taking time guys

[wildteen88]

PHP has a built in function for returning the keys a value is stored within the array. So need for any loops. Just two function calls max and array_keys:

<?php

$a = array ( 1, 4, 6, 3, 6, 1, 6 );

echo '<pre>' . print_r($a, true) . '</pre>';

$max  = max($a);              // get the max value in an array
$keys = array_keys($a, $max); // return the keys for the max value

echo 'Max value: ' . $max . "<br />\nFound in Keys:<ul>\n<li>" . implode("</li>\n<li>", $keys) . '</li></ul>';

?>

[asmith]

gotcha ! easiest

thanks everyone , solved !