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How do I find out the number of parameters passed into function. What is the purpose of the following files having extensions: frm, myd, and myi? This is easily accomplishable with a combination of using "passing by reference" and "variable variables". These are the scenarios that you may run into trying to reference superglobals dynamically.
Whether or not it works appears to be dependent upon the current scope. Note that normal variable variables will not be parsed in double-quoted strings. You'll have to use the braces to make it work, to resolve the ambiguity.
One interesting thing I found out: You can concatenate variables and use spaces. Concatenating constants and function calls are also possible. There was no problem because they were only referenced via a variable variable.
I only saw a parse error much later, when I tried to reference one directly. It took a while to realise that illegal hyphens were the cause because the parse error only occurs on assignment. PHP actually supports invoking a new instance of a class using a variable class name since at least version 5.
While not relevant in everyday PHP programming, it seems to be possible to insert whitespace and comments between the dollar signs of a variable variable. All three comment styles work. This information becomes relevant when writing a parser, tokenizer or something else that operates on PHP syntax. Another use for this feature in PHP is dynamic parsing..
Due to the rather odd structure of an input string I am currently parsing, I must have a reference for each particular object instantiation in the order which they were created.
In addition, because of the syntax of the input string, elements of the previous object creation are required for the current one. Normally, you won't need something this convolute. In this example, I needed to load an array with dynamically named objects - yes, this has some basic Object Oriented programming, please bare with me..
I haven't fully tested the implimentation of the objects. Reinforcement Learning. R Programming. React Native. Python Design Patterns. Python Pillow. Python Turtle. Verbal Ability. Interview Questions. Company Questions.
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