PHP: What are language constructs and why do we need them?

Question

I keep coming across statements like:

• \"echo is a language construct but print is a function and hence has a return value\"
• \"die is a language constr

Answer 1

language constructs can be formed in more than one way and has a return-value

print("asdf"); is as possible as print "asdf"; and will return 1.

echo("asdf"); is equal to echo "asdf;" but has no return-value.

die("asdf"); is equal to exit("asdf"); and hasn't a return-value too.