If you're new to PHP and want some learning examples and guidance, this article can help.
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Popularity Can Be Measured
Sometimes we deal with questions of popularity, and we need a way to collect opinions from our clients. This article shows a simple teaching example of how we might elect a favorite color by letting our clients vote for …
Deprecated and Headed for the Dustbin
By now, you have probably heard that some PHP features, while convenient, can also cause PHP security problems. This article discusses one of those, called register_globals. It is a thing you do not want. …
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions.
Consider email address RFCs:
Look at HTML5 form input element (with type=email) regex pattern: