create star triangle with php

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Answer

Solution:

You had the right idea with a for loop. You just need to know how long your input is, and pad the output with the length of your input, gradually getting smaller with each iteration.

<?php
# Replace this with whatever is the source of your input.
$input = '1225441';

# get total number of characters in input
$length = strlen($input);
# foreach character in input
for ($i = 0; $i < $length; $i++) {
    # echo the character as many times as $length - $i - 1.
    echo $input[$i] . str_repeat(0, $length - $i - 1) . '<br>';
}

This creates the output of:

Answer

Solution:

If it's hard for you to think about how to do it with PHP, then think first about the general way to do it, I mean the algorithm. You can represent it with a flow diagram. Then, you just need to translate it to PHP code.

And the result it can be something like this:

<?php

$n = 1225441;

$string = '' . $n; //Let`s have a string for better use string functions

for ($c = 0, $len = strlen($string); $c < $len; $c++) {
    echo substr($string, $c, 1);
    for ($k = $len - 1; $k > $c; $k--) {
        echo '0';
    }
    echo '<br />';
}

Answer

Solution:

Yet another solution as a one-liner.

$n = '1225441';
array_reduce(str_split($n),fn($c,$i)=>$c-(print $i.str_repeat('0',$c)."\n"),strlen($n)-1);

Output

Source