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$n = 5;
//层数
for ($i=1; $i<=$n; $i ){
//空格
for ($k=1; $k<=$n-$i; $k ){
echo " ";
}
//"*"号
for ($j=1; $j<=2*$i-1; $j ){
if ($i==1 || $i==$n){
echo "#";
}else{
if ($j==1 || $j==2*$i-1){
echo "";
Your logic is wrong
The ## logic below, just change it to this
//"*"号 for ($j=1; $j<=2*$i; $j++){ if ($i==$n){ echo "#"; }else{ if ($j==1 || $j==2*$i-1){ echo "#";}else{ echo " ";} }}
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Your logic is wrong
The ## logic below, just change it to this
//"*"号 for ($j=1; $j<=2*$i; $j++){ if ($i==$n){ echo "#"; }else{ if ($j==1 || $j==2*$i-1){ echo "#";}else{ echo " ";} }}