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PHP Callback Functions

Callbacks in User Defined Functions

Hello world! Hello world?

<?php
// define first callback function
function exclaim($str) {
  return $str . "! ";
}

// define second callback function
function ask($str) {
  return $str . "? ";
}

function printFormatted($str, $format) {
  // Calling the $format callback function
  echo $format($str);
}

// Pass "exclaim" and "ask" as callback functions to printFormatted()
printFormatted("Hello world", "exclaim");
printFormatted("Hello world", "ask");
?>