PHP函数

<?php
function example($num){
 return “$num*$num=”.$num*$num;
}echo example(10);?>  <?php
/* function example($num){
 return “$num*$num=”.$num*$num;
}echo example(10); */?> <?php
function example($m){
 $m=$m*5+10;
 echo “在函数内：\$m=”.$m;
}$m=1;
example($m);
?>