The main factor of the PHP language is usability. PHP should provide the programmer with the means to quickly and efficiently solve the assigned tasks. The practical nature of PHP is due to five important characteristics:
There is another “characteristic” that makes PHP especially attractive: it”s free! Moreover, with open source (Open Source).
The PHP language will seem familiar to programmers in different fields. Many language constructions are borrowed from C, Perl.
PHP code is very similar to that found in typical C or Pascal programs. This significantly reduces the initial effort when learning PHP. PHP is a language that combines the advantages of Perl and C and is specifically aimed at working on the Internet, a language with a universal (albeit with some reservations) and clear syntax.
And although PHP is a fairly young language, it has gained such popularity among web programmers that at the moment it is almost the most popular language for creating web applications (scripts).
A PHP script can be 10,000 lines or just one line, depending on your specific task. You don”t have to load libraries, specify special compilation options, or anything like that. The PHP engine simply starts executing code after the first escape sequence (<?) And continues until it encounters a pairing escape sequence (?>). If the code has the correct syntax, it is executed exactly as the programmer specified.
PHP is a language that can be embedded directly into the html code of pages, which, in turn, will be correctly processed by the PHP interpreter. We can use PHP to write CGI scripts and get rid of a lot of awkward text output statements. We can use PHP to render HTML documents by eliminating a lot of external script calls.
PHP”s wide variety of functions save you the hassle of writing multi-line UDFs in C or Pascal.
Efficiency is critical when programming for multi-user environments like the web.
A very important advantage of PHP is its “engine”. The PHP engine is neither a compiler nor an interpreter. He is a translating interpreter. Such a device of the PHP engine allows you to process scripts at a fairly high speed.
By some estimates, most PHP scripts (especially not very large ones) run faster than their Perl counterparts. However, whatever PHP developers do, compiled executables will run much faster – tens, and sometimes hundreds of times. But PHP”s performance is quite sufficient for creating quite serious web applications. Details about the structure and characteristics of the PHP “engine” can be found here.
PHP provides developers and administrators with flexible and effective security tools, which are roughly divided into two categories: system-level tools and application-level tools.
1. System-level security tools
PHP implements security mechanisms that are managed by administrators; when properly configured, PHP provides maximum flexibility and security. PHP can operate in the so-called safe mode, which limits the use of PHP by users in a number of important ways. For example, you can limit the maximum execution time and memory usage (uncontrolled memory usage negatively affects server performance). By analogy with cgi-bin, the administrator can also set restrictions on the directories in which the user can view and execute PHP scripts, and also use PHP scripts to view confidential information on the server (for example, the passwd file).
2. Application level security
PHP comes standard with a number of strong encryption mechanisms. PHP is also compatible with many third-party applications, making it easy to integrate with secure e-commerce technologies. Another advantage is that the source of PHP scripts cannot be viewed in a browser, since the script is compiled before it is submitted at the user”s request. The server-side PHP implementation prevents non-trivial scripts from being stolen by users who have enough knowledge to at least execute the View Source command.