Call-time pass-by-reference has been removed
来源:互联网 发布:有手机设计软件 编辑:程序博客网 时间:2024/05/14 23:51
Call-time pass-by-reference has been removed的意思是调用时引用传参已经被移除了,就是不能通过function(&$a)这种方式传参调用函数.解决方案:查看你的php.ini配置文件,把其中的 allow_call_time_pass_reference参数调整为On,并重启服务器试试。
php5已经不建议这样配置,会出现如下提示
也就是说allow_call_time_pass_reference功能在新版本的php中不在可用。
======================================以前的php5.4版本的php代码可能会出现这种错误:
Fatal error: Call-time pass-by-reference has been removed in D:\xampp\htdocs\app\app.php on line 61当我们这样使用函数
foo(&$var);(或者类)的话,会产生一个error:实际上,这样用本来就是错的,只是之前的错误级别仅仅是Deprecated而已。而正确的使用方法应该是在函数
定义时:function foo(& $var) { //other code}在调用时了: foo($var);
简单点说就是说老本的代码调用函数时写foo(&$var)变为了新的代码foo($var)
但感觉这样做并不是很好:
首先,我当初对这种调用方式并不是很熟,我原以为像C#的ref一样,定义的有&那调用时也要有,配对出现,很合理。
但看现在的说明,看来php原来是很自由的:调用时有&,那就是传参,定义时有&也是传参,二者有其一即可。
现在的情况是取消了调用时写&的方式,只能在定义时用。
但这样忽略了另一种使用上的问题
这样定义:function foo(& $var) { //other code }这样调用:foo(&$var)
这样我就明确知道,这个参数可能被改掉,而不用去实际的函数定义里查看它会不会被改,这是一个明确的预期。
虽然语言上支持定义时写&调用时不写,但项目管理上如果规定这样写,可以减少很多不必要的BUG,比如调用别人的函数时莫名其妙的值就被改了,会产生一些不能预知的问题。
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