What is PHP ?:
PHP (recursive acronym for "PHP: Hypertext Preprocessor") is a widely used Open Source general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. PHP is a project of the Apache Software Foundation. "PHP is a server-side, cross-platform, HTML embedded scripting language."
Example 1-1. An introductory example :
echo "Hi, I'm a PHP script!";
?>
Notice how this is different from a script written in other languages like Perl or C -- instead of writing a program with lots of commands to output HTML, you write an HTML script with some embedded code to do something (in this case, output some text). The PHP code is enclosed in special start and end tags that allow you to jump into and out of "PHP mode".
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