Programs to print * pattern in descending order

Pattern 1:

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

$input = 5;

for ($i = 0; $i < $input; $i++) {
    for ($j = $i; $j < $input; $j++) {
        echo '*  ';
    }
    echo PHP_EOL;
}

So what happens here is -

Here take a note that we are looping both the for loops in row-wise and the column-wise pattern.

In the first for loop, we are iterating for 5 times ($i < $input). It will loop like this.
$i=0 -> $i=1 -> $i=2 -> $i=3 -> $i=4

Then in the inner loop, we will assign $i to $j so that the inner loop will iterate depending upon the outer loop. Then we added $j < $input to make sure that assigned value to $j should always be less than $input.

Then, we added echo '*  '; (some space after * to beautify patterns for visual purpose)

And finally, after inner for loop, we added PHP_EOL to make sure that whenever inner loop ends then the next stars(*) will print in the next line.

So our loop will print like following-

First Iteration:

for ($i = 0; $i < 5; $i++) {
    for ($j = $i; $j < 5; $j++) { // $j = 0, $j = 1, $j = 2, $j = 3, $j = 4
        echo '*  ';
    }
    echo PHP_EOL;
}

// output
* * * * *

Second iteration:

for ($i = 1; $i < 5; $i++) {
    for ($j = $i; $j < 5; $j++) { // $j = 1, $j = 2, $j = 3, $j = 4
        echo '*  ';
    }
    echo PHP_EOL;
}

// output
* * * *

Third Iteration:

for ($i = 2; $i < 5; $i++) {
    for ($j = $i; $j < 5; $j++) { // $j = 2, $j = 3, $j = 4
        echo '*  ';
    }
    echo PHP_EOL;
}

// output
* * *

Fourth Iteration:

for ($i = 3; $i < 5; $i++) {
    for ($j = $i; $j < 5; $j++) { // $j = 3, $j = 4
        echo '*  ';
    }
    echo PHP_EOL;
}

// output
* *

Fifth Iteration:

for ($i = 4; $i < 5; $i++) {
    for ($j = $i; $j < 5; $j++) {  // $j = 4
        echo '*  ';
    }
    echo PHP_EOL;
}

// output
*

So Final output becomes-

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