Replace
for($i=0;$i<count($ar);$i++) {
with
$c = max( count($ar),count($br);
for($i=0;$i<$c;$i++) {
HalfaBee
Comparing two arrays and showing diffs
<?php
$ar_1 = array(1,3,5,7,9):
$ar_2 = array(2,3,4,8);
$ar_3 = array_diff($ar_1,$ar_2);
for($i=0;$i<count($ar_3);$i++)
{
echo "\$ar_3['" . $i . "'] = " . $ar_3[$i] . "<br />\n";
} //end for
?>ohh ohh my turn!
<?
$ar = array(1, 2, 3, 4);
$br = array(3, 2, 1, 4, 5);
echo "<table border=1><tr><td>ar</td><td>br</td></tr>\n";
for($i=0;$i<max(count($ar), count($br));$i++)
{
if ($ar[$i] === $br[$i])
{
echo '<tr><td>' . $ar[$i] . '</td><td>' . $br[$i] . "</td></tr>\n";
}
else
{
if (!empty($ar[$i]))
echo '<tr><td>' . $ar[$i] . "</td><td>&nbsp;</td></tr>\n";
if (!empty($br[$i]))
echo '<tr><td>&nbsp;</td><td>' . $br[$i] . "</td></tr>\n";
}
}
echo "</table>\n";
?>
it works... tested it 
basically just combined the ideas in the thread and didnt use array_diff like you didnt want 
[edit - fixed it to stop displaying double tr's once it passed the smaller arrays bounds --]
Originally posted by tekky
ohh ohh my turn!
me too! me too!
$ar = array(1, 2, 6, 4);
$br = array(3, 7, 1, 4, 5,9,12);
echo "<table border=1><tr><td>ar</td>";
echo "<td>br</td></tr>\n";
sort($ar); sort($br); $i=0; $j=0;
while( ($i<count($ar)) && ($j<count($br)) )
{
if($ar[$i]==$br[$j])
{
echo '<tr><td>' . $ar[$i] . '</td>';
echo '<td>' . $br[$j] . '</td></tr>';
$i++; $j++;
} else if($ar[$i]<$br[$j]) {
echo '<tr><td>' . $ar[$i] . '</td>';
echo '<td> </td></tr>';
$i++;
} else if($ar[$i]>$br[$j]) {
echo '<tr><td> </td>';
echo '<td>' . $br[$j] . '</td></tr>';
$j++;
}
}
while($i<count($ar))
{
echo '<tr><td>' . $ar[$i] . '</td>';
echo '<td> </td></tr>';
$i++;
}
while($j<count($br))
{
echo '<tr><td> </td>';
echo '<td>' . $br[$j] . '</td></tr>';
$j++;
}
echo "</table>";
?>
I dont think sorting was something he wanted... or for the values to flip flop since he labled the top of each column ar/br :p
Originally posted by tekky
I dont think sorting was something he wanted... or for the values to flip flop since he labled the top of each column ar/br :p
It was strongest of me! It's the "Contest" soul, I think...
This is a really good "Code Contest" thread!
Without sorting you need to do a n*n compares...
(for example...
for($i=0; $i<count($ar); $i++)
if(in_array($ar[$i],$br))
{
echo '<tr><td>' . $ar[$i] . '</td>';
echo '<td>' . $ar[$i] . '</td></tr>';
} else {
echo '<tr><td>' . $ar[$i] . '</td>';
echo '<td> </td></tr>';
}
for($i=0; $i<count($br); $i++)
if(!in_array($br[$i],$ar))
{
echo '<tr><td> </td>';
echo '<td>' . $br[$i] . '</td></tr>';
}
...)
Instead, with a custom sorting you can do it in n*log(n) compares, I think. I think I will try next... 
bye bye
(what about flip flop 
?)
woops in reading the ar < br part I thought you were outputting the lowest value one first like 1 4 even if ar was 4 and br was 1... woops
and by the sound of his question he wanted to compare like array keys to like array keys... maybe I mis understand him :p
How about this.
<?
$ar = array(1, 2, 6, 4);
$br = array(3, 7, 1, 4, 5,9,12);
echo "<table border=1><tr><td>ar</td>";
echo "<td>br</td></tr>\n";
sort( $ar );
reset( $ar );
sort( $br );
reset( $br );
$av = current( $ar );
$bv = current( $br );
while( $av AND $bv ) {
if($av==$bv) {
echo '<tr><td>' . $av . '</td>';
echo '<td>' . $bv . '</td></tr>';
$av = next( $ar );
$bv = next( $br );
} else if($av<$bv) {
echo '<tr><td>' . $av . '</td>';
echo '<td> </td></tr>';
$av = next( $ar );
} else if($av>$bv) {
echo '<tr><td> </td>';
echo '<td>' . $bv . '</td></tr>';
$bv = next( $br );
}
}
echo "</table>";
?>HalfaBee
I had a problem with a multi-dimentional array, but I just found a solution for it. Maybe my function will help you solving your problem too.
http://www.phpbuilder.com/board/showthread.php?s=&threadid=10259540
Originally posted by HalfaBee
How about this.
Great. This version show even the number when count() are diff.
<?
$ar = array(1, 2, 6, 4);
$br = array(3, 7, 1, 4, 5,9,12);
echo "<table border=1><tr><td>ar</td>";
echo "<td>br</td></tr>\n";
sort($ar); reset($ar); sort($br); reset($br);
$av = current( $ar ); $bv = current( $br );
while( $av OR $bv ) {
if($av==$bv) {
$ap = $av; $bp = $bv;
$av = next( $ar ); $bv = next( $br );
} else if(($av)&&(($av<$bv) || !($bv))) {
$ap = $av; $bp = " ";
$av = next( $ar );
} else if(($bv)&&(($av>$bv)|| !($av))) {
$ap = " "; $bp = $bv;
$bv = next( $br );
}
echo '<tr><td>' . $ap . '</td>';
echo '<td>' . $bp . '</td></tr>';
}
echo "</table>";
?>
wow!!!!!
This thread is getting good.
You guys have accomplished what I was trying to do, and you did it in several different ways.
I did not consider sorting when I first posted, but that does have an added value for me.
I appreciate you guys work, and will be digging through everything you have done.
thank you