Pascal Triangle

<?php
$end = intval(readline());
$n=1;
$line=array(1,1);
$tempLine=array();
while($n<=$end){
    if ($n == 1){
        echo 1 . PHP_EOL;
        $n++;
        continue;
    }
    if ($n==2){
        echo "1 1" . PHP_EOL;
        $n++;
        continue;
    }
    else {
        for ($i=0;$i<$n;$i++){
            if ($i==0){
                array_push($tempLine,$line[$i]+0);
                continue;
            }
            if($i==$n-1){
                array_push($tempLine,$line[$i-1]+0);
                continue;
            }
            array_push($tempLine,$line[$i]+$line[$i-1]);

        }
        echo join(" ",$tempLine);
        echo PHP_EOL;
        $line=array();
        $line=$tempLine;
        $tempLine=array();
        $n++;
    }
}