Answer by Ravi Hirani for how works or operator in if statements and print

For your first question,

your getnext() function must be return some valid integer value then only you can compare it with integer 1.

for second,You should write

if($a == 1 && $b == 1){    echo 'both are 1';}else if($a == 1){    echo '$a is 1';}else if($b == 1){    echo '$b is 1';}else{    // both are not 1}

also see this links,logical operators or vs || (double pipe) in php

PHP: return value from function and echo it directly?