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https://stackoverflow.com/questions/6620019/check-if-sql-row-exists-with-php
https://www.daniweb.com/programming/web-development/threads/517424/how-will-i-check-name-already-exists-in-php-mysql
https://blog.arvixe.com/how-to-check-if-record-exists-in-sql-database-table-with-php/
https://www.plus2net.com/sql_tutorial/record-exist.php
https://ben.lobaugh.net/blog/117/php-mysql-checking-to-see-if-a-record-exists-in-the-database
https://itknowledgeexchange.techtarget.com/itanswers/check-sql-row-exists-using-php/
https://phpdelusions.net/pdo_examples/check_email_exists
https://www.dmxzone.com/go/4615/how-to-find-out-if-a-record-already-exists-in-a-database-if-it-doesn-t-insert-a/
https://www.quora.com/How-can-I-check-if-a-user-already-exists-with-MySQL-and-PHP-What-do-I-need-to-do-first
https://cullenwebservices.com/how-to-check-if-a-record-exists-in-a-mysql-database/
https://www.w3schools.com/sql/sql_exists.asp
https://www.sitepoint.com/community/t/php-mysqli-check-if-row-exists/279578
http://codewithawa.com/posts/check-if-username-is-already-taken-with-php-and-mysql