在php中全局化变量

Question

I have 2 files. Lets say :

first.php

$a = 'blah';
echo 'echo2='.$a;

function foo(){
global $a;
echo 'echo3='.$a;
return $a;
}

second.php

require_once(path/to/the/file/first.php);
echo 'echo='.$a;
$b = foo();
echo 'echo4='.$b;

running the second.php file I get the following output :

echo=blah
echo2=blah
echo3=
echo4=

My question is "why I can't access variable $a in the function foo !

Answer 1

Change $global to global. That should fix it.

http://php.net/manual/en/language.variables.scope.php