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Editor to share with you how to use PHP's own server to view regular matching results, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

As we all know, PHP code needs a web server to execute, and to test PHP code, we have to build a web server, which brings us a lot of inconvenience to learn. Fortunately, after PHP v5.4, PHP will come with a simple web server.

Start the built-in web server

First, go to the custom web folder, and then start the built-in web server:

Cd ~ / public_htmlphp-S localhost:8000

Port number 8000 is customized and can be replaced with other unused ports.

After startup, the control interface is as follows:

Test the built-in server

Create a test.php under the public_html folder

Then visit localhost:8000/test.php in the browser, and you should see the information page of php:

Regular matching

Let's take a look at a simple example of regular matching by PHP:

You can view the running results through PHP's built-in web server, and if nothing happens, you can see the following output

Array ([0] = > Array ([0] = > c3de [1] = > 2))

Next, let's take a closer look at the code.

Preg_match function

The prototype of the preg_match function is int preg_match (string $pattern, string $subject [, array & $matches [, int $flags = 0 [, int $offset = 0]). Where pattern is the regular expression, subject is the matched string, followed by optional parameters. The PREG_OFFSET_CAPTURE in the code is the matching value, and the function is to output the offset of the matching result to the matches variable together with the matching result. By default, only the matching result is output to matches. For a detailed description of this function, please refer to the preg_match official documentation.

Regular expression

The'/ c\ def/' in the code is a regular expression, which in most programs is placed between two forward slashes. \ d represents matching numbers, so the regular expression in the code matches the string of c-numeric def. For more syntax on regular expressions, see the 30-minute getting started tutorial on regular expressions. Incidentally, a pattern modifier can be added after the second slash of a regular expression. The simplest pattern modifier is I, which ignores case when matching. For example, the regular expression / def/ matches the string abcDef will fail, while the / def/i matches the string abcDef will succeed. For more pattern modifiers, see pattern modifiers.

Print_r function

The print_r function prints information about a variable that is easy to understand. Unlike print and echo, which can only print ordinary variables such as strings and integers, print_r can also print array and object variables and output them in a format that is easy to understand. Speaking of this, there is another function that is often used to print information in PHP, that is, the var_dump function. Like the name of a function, this function is often used under debugging, printing not only the value of the variable, but also the type of the variable.

The above is all the contents of the article "how to view regular matching results through PHP's own server". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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