I can't connect to the database. What is the problem?

Question

PHP

Can't connect to postgres database using PDO. The connection works without PDO. Here's what it throws:
DataTables warning: table id=example - An error occurred while connecting to the database. The error reported by the server was: SQLSTATE[28000] [1045] Access denied for user 'postgres'@'localhost' (using password: YES
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Answer 1

stackoverflow.com/questions/10299148/mysql-error-1... there are solutions here