/PHP/Php if in database field exists, if exists update, if not create

Php if in database field exists, if exists update, if not create

INSERT INTO <table> (field1, field2, field3, ...) 
VALUES ('value1', 'value2','value3', ...)
ON DUPLICATE KEY UPDATE
field1='value1', field2='value2', field3='value3', ...

Source: stackoverflow.com

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