PHP loop through inverted pyramid

I found the Inverted Pyramid that I wrote when I was learning PHP a few months ago. It took me more than an hour to understand it. I was still depressed about how I wrote it back then. It turned out to be regular. Now I have refined the code and written it down. Code is something I’m really afraid of forgetting -_-!!!

Code:

function a($n){
$p = ($n+1) /2;                                                                                                                               use using using               ‐ ’ ’ s ‑       ‐ ‐ ‐ ‐ calculated for the middle line number
                                                                  to                                2*$i-1; //Upper half: number of * signs in each line
          $sp = ($n-$m)/2;                                                                                                                                                                                                                          Number
for ($ j = 1; $ j & lt; = $ sp; $ j ++) {echo "& nbsp;" ";} // space
for ($ j = 1; $ j & lt; = $ j ++) {echo "*";}                                                                             } Else {
if ($ i == $ p) {// Traversing the middle line: the number in the middle is just equal to the number of rows
for ($ j = 1; $ j & lt; = $ n; $ j ++) {echo "" "{echo" " "
                                                                                                           /*Number of numbers (regular-symmetrical)
                                                                                                                                                                                                                                                                                        echo " ";}                                                                                                                                                      for($j=1;$j< ;=$sp;$j++){echo " ";}                                                                                                                                                                                                       
}
}
a(9);
?>


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The above introduces the PHP loop traversal of the inverted pyramid, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.