String Formation Through Loops in PHP

Using loops, you can form strings. Let's create a string filled with ten letters 'x' as an example:

<?php
	$str = '';
	
	for ($i = 0; $i < 10; $i++) {
		$str .= 'x';
	}
	
	echo $str;
?>

Now let's make a string '12345'. To do this, we will add the loop counter to our variable:

<?php
	$str = '';
	
	for ($i = 1; $i <= 5; $i++) {
		$str = $str . $i;
	}
	
	echo $str; // will output '12345'
?>

Using a loop, form a string filled with 5 hyphens.

Using a loop, form the string '123456789'.

Using a loop, form the string '987654321'.

Using a loop, form the string '-1-2-3-4-5-6-7-8-9-'.