for(int i=0; i< arr.length;i++){

     boolean isLastElem = i== (arr.length -1) ? true : false;

}

$numItems = count($arr);
$i = 0;
foreach($arr as $key=>$value) {
  if($i+1 == $numItems) {
    echo "last index!";
  }
  $i++;
}

$last_key = end(array_keys($array));
foreach ($array as $key => $value) {
    if ($key == $last_key) {
        // last element
    } else {
        // not last element
    }
}

foreach($input as $key => $value) {
    $ret .= "$value";
    if (next($input)==true) $ret .= ",";
}

$toEnd = count($arr);
foreach($arr as $key=>$value) {
  if (--$toEnd) {
    echo "last index! $value";
  }
}

foreach($arr as $key=>$value) {
  //something
}
echo "last index! $key => $value";

$keys = array_keys($array);
for ($i = 0, $l = count($array); $i < $l; ++$i) {
    $key = $array[$i];
    $value = $array[$key];
    $isLastItem = ($i == ($l - 1));
    // do stuff
}

// or this way...

$i = 0;
$l = count($array);
foreach ($array as $key => $value) {
    $isLastItem = ($i == ($l - 1));
    // do stuff
    ++$i;
}

for ($i=0;$i<count(arr);$i++){
    $i == count(arr)-1 ? true : false;
}

end(arr);

arr[1];

$first = true;
foreach($array as $key => $value) {
    if ($first) {
        $first = false;
        // Do what you want to do before the first element
        echo "List of key, value pairs:n";
    } else {
        // Do what you want to do at the end of every element
        // except the last, assuming the list has more than one element
        echo "n";
    }
    // Do what you want to do for the current element
    echo $key . ' => ' . $value;
}

$first = true;
foreach($array as $key => $subArray) {
    if ($first) {
        $string = "List of key => value array pairs:n";
        $first = false;
    } else {
        echo "n";
    }

    $string .= $key . '=>(';
    $first = true;
    foreach($subArray as $key => $value) {
        if ($first) {
            $first = false;
        } else {
            $string .= ', ';
        }
        $string .= $key . '=>' . $value;
    }
    $string .= ')';
}
echo $string;

List of key => value array pairs:
key1=>(v1_key1=>v1_val1, v1_key2=>v1_val2)
key2=>(v2_key1=>v2_val1, v2_key2=>v2_val2, v2_key3=>v2_val3)
key3=>(v3_key1=>v3_val1)

$arr = range(1, 10);

$end = end($arr);
reset($arr);

while( list($k, $v) = each($arr) )
{
    if( $n == $end )
    {
    	echo 'last!';
    }
    else
    {
    	echo sprintf('%s ', $v);
    }
}

$rev_array = array_reverse($array);

   echo array_pop($rev_array);

<?php
 $week=array('one'=>'monday','two'=>'tuesday','three'=>'wednesday','four'=>'thursday','five'=>'friday','six'=>'saturday','seven'=>'sunday');
 $keys = array_keys($week);
 $string = "INSERT INTO my_table ('";
 $string .= implode("','", $keys);
 $string .= "') VALUES ('";
 $string .= implode("','", $week);
 $string .= "');";
 echo $string;
?>

end( $elements );
$endKey = key($elements);
foreach ($elements as $key => $value)
{
     if ($key == $endKey) // -- this is the last item
     {
          // do something
     }

     // more code
}

$numItems = count($arr);
$i=0;
$firstitem=$arr[0];
$i++;
while($i<$numItems-1){
    $some_item=$arr[$i];
    $i++;
}
$last_item=$arr[$i];
$i++;

$array = array(
    'First',
    'Second',
    'Third',
    'Last'
);

foreach($array as $key => $value)
{
    if(end($array) === $value)
    {
       echo "last index!" . $value;
    }
}

$arr = range(1, 3);

$it = new CachingIterator(new ArrayIterator($arr));
foreach($it as $key => $value)
{
  if (!$it->hasNext()) echo 'Last:';
  echo $value, "n";
}

$strReturn = (string) "";


# Compile the set:
foreach ($aArr as $sItem) {
    $strReturn .= $sItem . $sSep;
}

# Easy strip the end:
$strReturn = str_replace($sSep . $sAdd, "", $strReturn . $sAdd);

return $strReturn;