usually processed by a PHP interpreter implemented as a module in the web server or as a Common Gateway Interface (CGI) executable
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variable details
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prefixed with $, implicit typing (not declared in advance. case sensitive
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PHP
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PHP: Hypertext preprocesor
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delimiter
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required for executable php code <?php ?>
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CGI
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Common gateway interface: offers a standard protocol for web servers to execute programs that execute like console applications (also called command-line interface programs) running on a server that generates web pages dynamically