PHP
php
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<?php
echo triangle(5);
function triangle($lvl) {
$resstr = '';
for ($i=1; $i<=$lvl; $i++) {
for ($k=1; $k<=$lvl-$i; $k++) {
$resstr .= ' ';
}
for ($j=1; $j<=$i; $j++) {
$resstr .= $j;
}
$resstr .= '<br>';
}
return $resstr;
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