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PHP course. Variables (symbolic links) and Predefined variables
Description
References in PHP are a means of accessing the contents of a single variable under different names. They are not like C pointers; for example, you cannot perform address arithmetic on them, they are not real addresses in memory, etc.
Instead, pointers in PHP are aliases in a variable name table. In PHP, the name of a variable and its contents are different things, so the same contents can have different names. An analogy can be made with file names and file names in Unix: variable names are directory entries, and the contents of a variable are the file itself. References in PHP are analogous to hard links in Unix file systems.
In this tutorial, we'll explore references. This topic is a bit peculiar: the link mechanism is rarely used directly.
But it's still an important topic. When we start using arrays and objects, we will need an understanding of how references work.
Don't take this material too seriously. The main thing is to grasp the concept and know the concept itself, the rest is by necessity.
References in PHP are a means of accessing the contents of a single variable under different names.
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