Strings,Dates, and Times ($$$)

Read all about printf and sprintf on pages 171 to 180. Also take a look at the manual page here: springf

Notes:
  • specifying the width of a column will not work in a browser unless you output the code a s fix width font and inside of a <pre> tag to retain the spaces.
  • You can simplify the argument swapping format string by using single quotes, so you don't have to escape the $:
    '%2$02d/%1$02d/%3$d<br />'
  • Another useful function the book does not show is the number_format function, it will add commas every thousand. Here is some sample code to see what it does:
$price = 45240.75;
$milesAroundEarth = 24901.55;
echo '<br />$' . number_format($price); // no decimal places
echo '<br />$' . number_format($price,2); // two decimals
echo '<br />' . number_format($milesAroundEarth, 1); // one decimal?>

this outputs:

$45,241
$45,240.75
24,901.6

Question:

what does the following code output?

$x = 54.23;
printf('%07d', $x);