How to print a solid and Hollow Diamond with side length N by php

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This paper describes the method of printing a solid and hollow diamond with a side length of N by php. Share it with you for your reference. The specific analysis is as follows:

Solid diamond calculation method:

$n: side length

$I: current line, starting with 0

$rows: total number of lines

Upper part

Number of leading spaces = $n-$i-1

Number of characters = $iTunes 2 characters 1

Lower part

Number of leading spaces = $i-$n+1

Number of characters = ($rows-$i) * 2-1

Using str_pad can reduce cycles such as for/while

/ * * print solid diamond * @ param int $n side length. Default is 5 * @ param String $s. Default is * * @ return String * / function solidDiamond ($str =''). / / calculate the total number of lines $rows = $nasty 2-1; / / cycle the * for ($iS0; $I) of each line