Consult a PHP & operation related Issues

Consult a PHP & operational issue

Where Os_type is 3 os_rs[' App_key '] is 134217728 that is 16 binary 8000000

echo "#########". "
";
echo $os _type. " ". $os _rs[' App_key ')."
";
Echo ($os _type) & ($os _rs[' App_key '); = = "The result is 1 .
echo "
";
Echo (3) & ($os _rs[' App_key '); = = = "The result is 0 is normal.
echo "
";
Echo (268435455) & ($os _rs[' App_key '); = = = "The result is 134217728 also normal
echo "
";
Echo $os _type&134217728; = = = "The result is 0 is normal.
echo "
";

echo "";
echo "
if ($flag! = 0)
echo "checked=\" checked\ "";
echo ">";
echo "$app _str";
echo "";
echo "";


The weird thing is why 2 variables & operation result is 1, is not involved with the symbol of the problem
------Solution--------------------
I'm 0 on this side of the line.
------Solution--------------------
Echo ($os _type) & ($os _rs[' App_key '); 0

What's the complicated situation, you say it and see

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