Sr. PHP Programmer Question:
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What is the purpose of _FILE_ constant?

Answer:

_FILE_ − The full path and filename of the file. If used inside an include,the name of the included file is returned. Since PHP 4.0.2, _FILE_ always contains an absolute path whereas in older versions it contained relative path under some circumstances.

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How will you define a constant in PHP?require_once(), require(), include(). What is difference between them?