You can also pass a reference to the function. Example: [php] $file_name = "image01.jpg"; echo end(explode(‘.’, $file_name)); [/php] This renders the above notice. Asking for help, clarification, or responding to other answers. This array is passed by reference because it is modified by the function. ERROR : Fatal error: Only variables can be passed by reference in D:\www\authenticate.php on line 143 in this line socket_select($sett,null,null,5); please help 最近做项目，发现了一个报错 Only variables can be passed by reference， 意思是“只有变量能通过‘引用’”. 这个问题多半是因为引用传递 …

. php Only variables can be passed by reference It's by value according to the PHP Documentation. Filter. php5 This array is passed by reference because it is modified by the function. Pass by reference (C++ only) Pass-by-reference means to pass the reference of an argument in the calling function to the corresponding formal parameter of the called function. It is my understanding that the problem is related to the PHP version. If you are passing an object and calling a function in that object, that function may alter the object without you even … Passing