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

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How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?

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Are PDO prepared statements sufficient to prevent SQL injection?

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How to prevent XSS with HTML/PHP?

phpxss
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How do I implement basic "Long Polling"?

phphttpcomet
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