The best things about using PHP are that it is extremely easy for a newcomer, but offers many advanced features for a professional programmer. Do not be afraid to read the long list of PHP features. You can jump in a short time and start writing simple scripts in a couple of hours.
PHP is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.
PHP & MySQL Tutorial - 46: Form Validation in PHP
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