Pyramid graphics implemented using loops in PHP, php loop pyramid graphics_PHP tutorial

Pyramid graphics implemented using loops in PHP, php loop pyramid graphics

Today I learned the most basic PHP conditions and loop statements. Finally, the teacher asked a few questions. One of them was the image of a hollow pyramid that was quite interesting.

What the teacher wants us to achieve is:

*

* *

* * * The hollow pyramid.

First type:

Copy code The code is as follows:

for ($i=1;$i<=5;$i++){
         switch ($i){
case 1:
echo " "."*"." ";
                 break;
case 2:
echo " ";
                 break;
case 3:
echo " "."*"." "."*"." ";
                 break;
case 4:
echo " ";
                 break;
case 5:
                     echo "*"." "."*"." "."*";
break;
}
echo "
";

The implementation effect is the image requested by the teacher, but the teacher thinks there should be a simpler implementation method, which can output spaces and * signs separately;

So there is the second kind:

Copy code The code is as follows:

for($a=0;$a<4;$a++){
for($b=4;$b>$a;$b--){
echo " ";
}
for($c=1;$c<=$a;$c++){
                echo "*";
}
for($d=0;$d<=$a;$d++){
                echo "*";
}
echo "
";
}

The effect of this implementation is no longer hollow in the middle. The effect is as follows:

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

This is not hollow yet, I will try again later. Today’s first blog is completed, I hope I can write more in the future.

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