PHP loop traversal inverted pyramid

: This article mainly introduces PHP loop traversal inverted pyramid. if you are interested in the PHP Tutorial, refer to it. When I learned php a few months ago, I wrote the inverted pyramid. I saw it for more than a minute. I was still depressed about how I wrote it at the time. it turned out to be regular. now I have refined the code and noted it down. The code is really afraid to forget -_-!!!

Code:

Function a ($ n ){
$ P = ($ n + 1)/2; // calculate the middle row number
For ($ I = 1; $ I <= $ n; $ I ++ ){
If ($ I <$ p) {// traverse the upper half
$ M = 2 * $ I-1; // upper part: number of * numbers per line
$ Sp = ($ n-$ m)/2; // half of the number of spaces
$ I1 = $ m; // Number of stars
For ($ j = 1; $ j <= $ sp; $ j ++) {echo "" ;}// space
For ($ j = 1; $ j <= $ i1; $ j ++) {echo "*";} // PRINT *
For ($ j = 1; $ j <= $ sp; $ j ++) {echo "" ;}// space
Echo"
";
} Else {
If ($ I = $ p) {// traverse the middle row: the number in the middle is equal to the number of rows.
For ($ j = 1; $ j <= $ n; $ j ++) {echo "*";} // PRINT *
Echo"
";
}
Else {// traverse the lower half
$ I2 = 2 * ($ n + 1-$ I)-1; // * number (regular-symmetric)
$ Sp = ($ n-$ i2)/2; // half of the number of spaces
For ($ j = 1; $ j <= $ sp; $ j ++) {echo "" ;}// space
For ($ j = 1; $ j <= $ i2; $ j ++) {echo "*";} // PRINT *
For ($ j = 1; $ j <= $ sp; $ j ++) {echo "" ;}// space
Echo"
";
}
}
}
}
A (9 );
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