close
https://stackoverflow.com/questions/13530465/how-to-declare-a-global-variable-in-php
直接宣告 $GLOBALS['xxx']，就可以直接在function裏頭使用了。
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The $GLOBALS array can be used instead:
$GLOBALS['a'] = 'localhost';
function body(){
echo $GLOBALS['a'];
}
From the Manual:
An associative array containing references to all variables which are currently defined in the global scope of the script. The variable names are the keys of the array.
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