php中变量赋值是引用的例子

php中的变量赋值都是复制，但是有一个引用的例子，因为看手册的时候注意到了，在这里记下一笔

	$arr = array('name'=>'baixiaoshi','age'=>23);
	echo '<pre>';
		print_r($arr);
	echo '</pre>';
	$arr2 = $arr;
	//结果Array
/*(
    [name] => baixiaoshi
    [age] => 23
)*/

	$arr2['hobby'] = 'run';
	echo '<pre>';
		print_r($arr2);
	echo '</pre>';
	//结果
	//Array
/*(
    [name] => baixiaoshi
    [age] => 23
    [hobby] => run
)*/

但是你看下面神奇的globals这个超全局变量，默认赋值的却是引用，

$_POST['A'] = 'B';
 
	$nonReferencedPostVar = $_POST;
	$nonReferencedPostVar['A'] = 'C';
	 
	echo 'POST: '.$_POST['A'].', Variable: '.$nonReferencedPostVar['A']."\n\n";
	//输出结果POST: B, Variable: C
	// Testing Globals
	$GLOBALS['A'] = 'B';
	 
	$nonReferencedGlobalsVar = $GLOBALS;
	$nonReferencedGlobalsVar['A'] = 'C';
	 
	echo 'GLOBALS: '.$GLOBALS['A'].', Variable: '.$nonReferencedGlobalsVar['A']."\n\n"; 
	//输出结果
	// GLOBALS: C, Variable: C