FOR

For is one the most versatile and most widely used looping mechanism across most programming languages.

FOR (initialize counter; evaluate counter; increase counter) {
    // code to execute for each iteration
}

Example;

$result =  ''
FOR ($x = 0; $x < 10; $x++) {
    $result .= html:p('$x is ' . $x)
}
$result
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Here is how the above code works:

1. Initialize counter statement of $x = 0; initializes the $x and sets the starts the loop with value of $x set to 0.
2. Evaluate counter statement of $x < 10; will check the validation of the expression and as long as the $x value is less than 10 will continue the loop.
3. Increase counter statement of $x++; will increase $x by 1 after each iteration.