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PHP Strings

How do you retrieve client IP address using PHP?

How do you retrieve client IP address using PHP?
Explain $_GET, $_POST, and $_REQUEST variables.

Explain $_GET, $_POST, and $_REQUEST variables.
What are superglobals in PHP?

What are superglobals in PHP?
Explain the difference between single-quoted and double-quoted strings.

Explain the difference between single-quoted and double-quoted strings.
How can you format strings using sprintf() in PHP?

How can you format strings using sprintf() in PHP?
What is the purpose of nl2br() function?

What is the purpose of nl2br() function?
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