- var_dump: documentation ( source)
- htmlentities: documentation ( source)
- htmlspecialchars: documentation ( source)
- printf: documentation ( source)
<?php
$oranges = 10;
$apples = 5;
$string = "I have %d apples and %d oranges";
printf($string, $apples, $oranges);
var_dump(htmlentities($string, ENT_QUOTES));
var_dump(print htmlspecialchars($string));
?>