Php prints a solid and hollow rhombus type with a side length of N

This article mainly introduces the php method of printing a solid and hollow rhombus with a side length of N. the example shows the graph drawing technique of php loop statements, for more information about how to use php to print a solid and hollow rhombus with a side length of N, see the example in this article. Share it with you for your reference. The specific analysis is as follows:

Calculation method of solid diamond:
$ N: edge length
$ I: current row, starting from 0
$ Rows: total number of rows

Upper part
Front space = $ n-$ I-1
Character count = $ I * 2 + 1

Lower part
Number of leading spaces = $ I-$ n + 1
Number of characters = ($ rows-$ I) * 2-1

Use str_pad to reduce loops such as for and while.

The code is as follows:

/**
* Print solid diamond
* @ Param int $ n edge length. the default value is 5.
* @ Param String $ s: the character displayed. default value *
* @ Return String
*/
Function solidDiamond ($ n = 5, $ s = '*'){
$ Str = '';
// Calculate the total number of rows
$ Rows = $ n * 2-1;
// Calculate the number of rows in a loop *
For ($ I = 0; $ I <$ rows; $ I ++ ){
If ($ I <$ n) {// upper part
$ Str. = str_pad ('', ($ n-$ i-1 ),''). str_pad ('', $ I * 2 + 1, $ s ). "\ r \ n ";
} Else {// Lower part
$ Str. = str_pad ('', ($ I-$ n + 1 ),''). str_pad ('', ($ rows-$ I) * 2-1, $ s ). "\ r \ n ";
}
}
Return $ str;
}
Echo'

'; &lt;Br/&gt; echo solidDiamond (5); &lt;br/&gt; echo' ';

The code is as follows:

*
***
*****
*******
*********
*******
*****
***
*

Hollow rhombus computing method:
$ N: edge length
$ I: current row, starting from 0
$ Rows: total number of rows

Upper part
Front space = $ n-$ I-1
Number of blank spaces = $ I * 2 + 1-2
Characters = $ I * 2 + 1-Number of blank spaces

Lower part
Number of leading spaces = $ I-$ n + 1
Number of blank spaces = ($ rows-$ I) * 2-1-2
Number of characters = ($ rows-$ I) * 2-1-Number of blank spaces

The code is as follows:

/**
* Print hollow rhombus
* @ Param int $ n edge length. the default value is 5.
* @ Param String $ s: the character displayed. default value *
* @ Return String
*/
Function hollowDiamond ($ n = 5, $ s = '*'){
$ Str = '';
// Calculate the total number of rows
$ Rows = $ n * 2-1;
// Calculate the number of rows in a loop *
For ($ I = 0; $ I <$ rows; $ I ++ ){
If ($ I <$ n) {// upper part
$ Tmp = $ I * 2 + 1;
$ Str. = str_pad ('', ($ n-$ i-1 ),''). str_pad ('', $ tmp-2,'', STR_PAD_BOTH), $ tmp, $ s, STR_PAD_BOTH ). "\ r \ n ";
} Else {// Lower part
$ Tmp = ($ rows-$ I) * 2-1;
$ Str. = str_pad ('', ($ I-$ n + 1 ),''). str_pad ('', $ tmp-2,'', STR_PAD_BOTH), $ tmp, $ s, STR_PAD_BOTH ). "\ r \ n ";
}
}
Return $ str;
}
Echo'

'; &lt;Br/&gt; echo hollowDiamond (5); &lt;br/&gt; echo' ';

The code is as follows:

*
**
**
**
**
**
**
**
*

I hope this article will help you with php programming.