You might want to check out some of the string functions:
<?php
for ($i = 5; $i > 0; $i--) {
echo str_repeat(' ', 5 - $i).str_repeat('*',$i).PHP_EOL;
}
for ($i = 5; $i > 0; $i--) {
echo str_pad(str_repeat('*',$i),5,' ',STR_PAD_LEFT).PHP_EOL;
}
This runs on the command line, like so:
php filename.php
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solved Pyramid asterisk in PHP