複製代碼 代碼如下:
$long="big_long_variable_name";
$$long="PHP"; /* 用存放在變數$long裡的字串作為新變數的變數名，等同於$big_long_variable_name="PHP"; */
$short=& $big_long_variable_name; /* 取變數$big_long_variable_name的值賦給變數$short，此時$short的值為"PHP"，等同於$short=& $$long; */
print "01 /$short is $short."; /* "/$"是逸出序列，表示輸出一個貨幣符號$，下同。本語句的作用是輸出：01 $short is PHP. */
print "02 Long is $big_long_variable_name."; /* 輸出：02 Long is PHP. */
?>
print "03 /$short is $short"; /* 輸出：03 $short is PHP rocks! */
print "04 Long is $big_long_variable_name"; /* 輸出：04 Long is PHP rocks! */
?>
05 $short is PHP rocks!
06 Long is PHP rocks!
print "07 /$short is $short"; /* 輸出：07 $short is PHP rocks!Programming PHP rocks! */
print "08 Long is $big_long_variable_name"; /* 由於變數$short被重新賦值為Programming PHP rocks!，因而變數$big_long_variable_name的值也與$short一同被改變為"PHP rocks!Programming PHP rocks!"。本語句輸出：08 Long is PHP rocks!Programming PHP rocks!注意，如果是對具有相同值的一個變數進行銷毀unset( )，則另一個變數不適用於此種情況，即不會隨之被一同銷毀。*/
?>
09 $short is Programming PHP rocks!
10 Long is Programming PHP rocks!
print "11 /$short is $short"; /* 輸出：11 PHP rocks!Programming PHP rocks!Web Programming PHP rocks!Programming PHP rocks! */
print "12 Long is $big_long_variable_name";
?>
unset($big_long_variable_name); /* 用unset( )銷毀變數$big_long_variable_name，變數$short不會因此受到任何影響。*/
print "13 /$short is $short"; /* 雖然銷毀了變數$big_long_variable_name，但$short沒有受到影響，它的值仍是最近一次被賦予的PHP rocks!Programming PHP rocks!Web Programming PHP rocks!Programming PHP rocks! */
print "14 Long is $big_long_variable_name."; /* 變數$big_long_variable_name已被銷毀，故而無值。輸出：14 Long is. */
snow;
?>
print "15 /$short is $short."; /* 輸出：15 $short is No point TEST1. */
$short="No point TEST2 $short"; /* 重新對變數$short賦值。沒在$short的後面添加.（點號），但引用了它自身最近一次的值"No point TEST1"。*/
print "16 /$short is $short."; /* 輸出：16 $short is No point TEST2 No point TEST1. */
http://www.bkjia.com/PHPjc/621676.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/621676.htmlTechArticle複製代碼 代碼如下: ?php $long="big_long_variable_name"; $$long="PHP";/* 用存放在變數$long裡的字串作為新變數的變數名，等同於$big_long_variable_name...
