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This article mainly explains "what are the advanced application skills of PHP". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the advanced application skills of PHP"?

PHP's unique syntax is a mix of C, Java, Perl, and PHP's self-innovative syntax. It can execute dynamic web pages faster than CGI or Perl. Compared with other programming languages, the dynamic page made by PHP is executed by embedding the program into the HTML document, and the execution efficiency is much higher than that of CGI which completely generates HTML tags.

1. Use the ip2long () and long2ip () functions to convert IP addresses into integers and store them in the database.

This approach reduces storage to nearly 1/4 (15 bytes of char (15) to 4 bytes of shaping), makes it easier to calculate whether a particular address is a page in a section, and speeds up search and sorting (though sometimes just a little faster).

2. Use the checkdnsrr () function to verify the existence of the domain name when verifying the email address.

This built-in function confirms that the specified domain name can be resolved to an IP address. The user comments section of the PHP document of this function has a simple user-defined function based on checkdnsrr () to verify the validity of the email address. For those guys who think their email address is [url=mailto: "joeuser@wwwphp.net]" joeuser@ wwwphp.net [/ url] "rather than [url=mailto:" joeuser@php.net] "joeuser@ php.net [/ url]", this method can easily catch them.

3. If you are using PHP 5 and MySQL 4.1 or higher, consider abandoning the mysql_* family of functions and using the improved version of the mysqli_* series of functions.

A good feature is that you can use preprocessing statements, which can speed up queries if you are maintaining a database-intensive site. Some evaluation scores.

4. Learn to fall in love with ternary operators.

5. If you feel there is a reusable part of the project, check to see if it is in PEAR before you write down a line of code.

Many PHP programmers know that PEAR is a good repository, although many programmers don't. This online repository contains more than 400 reusable program fragments that you can immediately use in your program. Unless your project is really special, you can always find PEAR packages that will save you time. (see PECL)

6, use highlight_file () to automatically print out the beautifully formatted source code.

If you ask for help from a script in the message board or IRC, this function is very easy to use. Of course, be careful not to accidentally reveal your database connection information and password.

7. Use the error_reporting (0) function to prevent users from seeing potentially sensitive error messages.

Ideally, publishers should be completely banned in php.ini. But if you are using a shared web server and you do not have your own php.ini file, your best option in this case is to add error_reporting (0) before the first line of all scripts; (or use the require_once () method). This makes it possible to completely block sensitive SQL query statements and pathnames in the event of an error.

8. Use gzcompress () and gzuncompress () to explicitly compress / decompress strings before storing large strings in the web database.

This PHP built-in function uses the gzip algorithm to compress plain text up to 90%. I use these functions every time I want to read and write fields of type BLOB. The only exception is when I need a full-text search.

9, get multiple return values from a function by passing parameters by "reference".

Like ternary operators, most programmers with formal programming training know this technique. But programmers with HTML backgrounds larger than Pascal backgrounds have more or less wondered, "return multiple values from a function if you can only use return once?" The answer is to put a "&" symbol in front of the variable and pass it through a "reference" rather than a "value".

10, fully understand the dangers of "magic quotes" and SQL injection.

I hope all the developers reading here already know a lot about SQL injection. However, I still list this here because it is a bit difficult to understand. If you haven't heard this before, spend the rest of your day Google and reading.

Thank you for your reading, the above is the content of "what are the advanced application skills of PHP". After the study of this article, I believe you have a deeper understanding of the advanced application skills of PHP, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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