Read from stdin to a php variable

prompt.php

<?php
/**
 * Usage:
 * $answer = prompt("What is your quest?");
 * echo "Answer: $answer";
 * 
 * Outputs:
 * What is your quest?
 * I seek the holy grail!
 * Answer: I seek the holy grail!
 */
function prompt($msg){
	echo "$msg\n";
	return trim(fgets(STDIN));
}