How can the use of register_globals impact the functionality of PHP scripts, and why should it be avoided?

Using register_globals can impact the functionality of PHP scripts by making variables easily accessible and modifiable from external sources, leading to security vulnerabilities such as injection attacks. It is recommended to avoid using register_globals and instead use superglobal arrays like $_GET, $_POST, and $_SESSION to access variables in PHP scripts securely. 

// Turn off register_globals in PHP
ini_set('register_globals', 0);

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register_globals PHP scripts functionality impact avoid

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