How to check if a row exists in MySQL? (i.e. check if username or email exists in MySQL)

phpmysqlmysqlipdo
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Are PDO prepared statements sufficient to prevent SQL injection?

phpsecuritysql-injectionpdo
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mysqli or PDO - what are the pros and cons? [closed]

phpmysqlmysqlipdodatabase-abstraction
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How to apply bindValue method in LIMIT clause?

phpmysqlsqlpdobindvalue
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Reference — frequently asked questions about PDO

phppdo
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