PHP : What does the PHP error message "Notice: Use of undefined constant" mean?

PHP : What does the PHP error message "Notice: Use of undefined constant" mean?

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PHP : Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' in functions.php on line 73
PHP : Use of undefined constant REQUEST_URI - assumed 'REQUEST_URI' in functions.php on line 73
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the each() function is deprecated. this message will be suppressed on further calls

the each() function is deprecated. this message will be suppressed on further calls