PHP and Web Technology Basics

Search engines use automated programs called crawlers (also known as spiders or bots) to discover and index web pages. These crawlers follow links from page to page, collecting information about each page's content. Affiliate marketing, cost per impression, and cost per action are advertising models, not indexing mechanisms.

Spamdexing is indeed another term for search engine spam. It combines 'spam' and 'indexing' to describe deceptive techniques used to manipulate search engine rankings. Examples include repeating unrelated keywords, hiding text, and creating doorway pages.

AdSense is Google's advertising platform that pays website owners to display ads - it's NOT an SEO technique. Link exchange, social bookmarking, and directory submission are legitimate SEO strategies used to build backlinks and improve search rankings.

A script is a program or sequence of instructions that is interpreted or carried out by another program (called an interpreter or runtime environment), rather than being executed directly by the processor. Scripts are typically written in interpreted languages like JavaScript, PHP, Python, or shell scripts, which require an interpreter to translate and execute the code line by line. Direct processor execution would require compiled machine code, not script interpretation.

To solve this question, the user needs to know basic concepts of programming languages and how they are executed.

The answer is:

B. Slower

Scripts are interpreted line by line during runtime, whereas compiled programs are translated into machine language (binary code) before runtime. This means that compiled programs are faster than scripts because they do not require interpretation during runtime. On the other hand, scripts are easier to write, modify, and debug because they do not need to be compiled before execution.

PHP is an open-source, general-purpose scripting language that is especially suited for web development and can be embedded into HTML. The 'open source' designation means the source code is freely available for anyone to use, modify, and distribute. 'General purpose' indicates it's not limited to web-only tasks - PHP can be used for command-line scripting, GUI applications, and more. Option B incorrectly calls it proprietary (it's not owned by a single company), while options C and D incorrectly suggest it's limited to special purposes.

Option D 'PHP can not be embedded into html' is the statement that is NOT true. PHP was specifically designed to be embedded directly into HTML using PHP tags (), which is one of its fundamental features. Options A and B are true - PHP is widely used for web applications and makes websites dynamic by generating HTML content on-the-fly. Option C is technically true in that PHP is traditionally an interpreted language, though modern tools like HHVM, Phalanger, and Bcompiler can compile PHP applications for performance optimization.