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Global variable in computer programming, a global variable is a variable with global scope, meaning that it is visible (hence accessible) throughout the program, unless shadowed The set of all global variables is known as the global environment or global state. Basic language constructs php generally follows c syntax, with exceptions and enhancements for its main use in web development, which makes heavy use of string manipulation Php variables must be prefixed by $ This allows php to perform string interpolation in double quoted strings, where backslash is supported as an escape character. Variable shadowing in computer programming, variable shadowing occurs when a variable declared within a certain scope (decision block, method, or inner class) has the same name as a variable declared in an outer scope At the level of identifiers (names, rather than variables), this is known as name masking. Among these, magic_quotes_gpc and register_globals [325] configuration directives were the best known The latter made any url parameters become php variables, opening a path for serious security vulnerabilities by allowing an attacker to set the value of any uninitialized global variable and interfere with the execution of a php script. A global variable is a variable declared in the main body of the source code, outside all functions, while a local variable is one declared within the body of a function or a block. Data segment in computing, a data segment (often denoted.data) is a portion of an object file or the corresponding address space of a program that contains initialized static variables, that is, global variables and static local variables. Modifying local permanent variables (like static variables in c) Modifying an argument passed by reference Modifying a local variable, either automatic or static, of a function higher up in the function call sequence (usually via a pointer) ^ turner, david a., ed