compare and identify in arrays

StormS

Here is a puzzle....

4 arrays ( two and two belongs to each other ):

$REarrayMN3 // top_price
$REarrayNL3 // position of top_price

$REarrayMX3 // bottom_price
$REarrayXL3 // position of bottom_price

What I want to do is to find and identify if there is two tops and two bottoms that are equal within the same positions. Shown in this example...

$REarrayMN3: 12.20, 12.20, 13.32, 11.43
$REarrayNL3 : 1, 2, 3, 4

$REarrayMX3 : 10.21, 10.21, 11.19, 9.34
$REarrayXL3 : 1, 2, 3, 4

What I need to do is to either write this finding down to a new array or just extract the price/position in a direct output (e.g loop)

Anyone got a idea ?

regs

drawmack

And for asking an interesting question you receive the prize of complete and tested example code:

<?php
$money = array();
for($i=0;$i<100;$i++)
    $money[] = (mt_rand(150,200)/100);

$smoney = $money;
sort($smoney);

//Because of how we generated $money we know the maximum entry will be at most
//2.00 so we set our minimum starting value equal to this.
$min = 2.00;

//Because of how we generated $money we know the minimum entry will be at least
//1.50 so we set our maximum starting value to this.
$max = 1.50;

//Now we will walk through the array finding the minimum, maximum and any dups 
//that exist.
$mins = array();
$maxes = array();
for($i=0;$i<count($money);$i++) {
    if($money[$i] == $min)
        $mins[] = $i;
    elseif($money[$i] < $min) {
        $mins = array();
        $mins[] = $i;
        $min = $money[$i];
    } //end if

if($money[$i] == $max)
    $maxes[] = $i;
elseif($money[$i] > $max) {
    $maxes = array();
    $maxes[] = $i;
    $max = $money[$i];
} //end if
} //end for
?>
<p>Our minimum value is <?php echo $min ?> which occurs in array position(s) 
<?php echo implode(', ',$mins) ?>.</p>
<p>Our maximum value is <?php echo $max ?> which occurs in array position(s)
<?php echo implode(', ',$maxes) ?>.</p>
<p><b>Reality Check</b><br />
The original array in sorted order is:<blockquote>
<?php echo implode('<br />',$smoney) ?>
</blockquote>