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<?php function test($var) { $GLOBALS['a']++; //$var++; debug_zval_dump($var); //$GLOBALS['var']++; echo $var; echo $GLOBALS['a']; // echo $GLOBALS['var']; } $a = 0; $GLOBALS['a']++; debug_zval_dump($a); test($a); echo $GLOBALS['a']; echo $a;