$num = 10;
#function A( $arg ){
echo $arg;
//Go inside function A and run to execute function B
B( $arg);
## echo 'We need to keep working hard until God is moved by us';
echo $arg.'<br />';
## echo $number;
## echo 'I am a dog, the execution is finished<br />';
##}
Summer2018-07-30 10:52:13
You define a variable $num and then pass it as a parameter to function A without calling it.