PHP Tutorials

Make sure the recurrence occurs So far, you already know how to match a letter or number, but more likely, you might want to match a word or a group of numbers. A word consists of several letters, and a group of numbers has several singular parts.

Select Enclose all selections in parentheses, separating the adjacent selections by |. But with parentheses there is a side effect that the associated match is cached and available at this time?: Put the first option to eliminate this side

Before we speak the PHP logical operators, we refer to the precedence of the PHP operator, the so-called operator precedence, which is the calculation of which operation Mr. Foo in the expression, which is calculated after, as if, the result of the

What is a Boolean data type? Boolean is one of the PHP4 scalar data types, which is one of the more commonly used data types in PHP and can only hold two values of true and false values. It is case-insensitive, so true is the same as true. If we

As we all know, after we instantiate a class, accessing the properties of a class is accessed in such a format as the name of the property named-----so do you ever try to test the result directly with Echo or print output. Some people say, this

In the previous we used the Strtotime () function, which realized the function of comparing the size of two time, in addition to comparing the size of two dates, PHP can also accurately calculate the difference of two dates. In this chapter, we

Before we learned the Mktime () function, we know that the Mktime () function returns the UNIX timestamp based on the parameters given. The current timestamp is returned when the Mktime () function does not fill in the parameters Like

The functions in PHP look very simple, in fact, the function is very powerful, I here by the function name is fixed, can be divided into the following three major categories: A fixed-name function: Such functions, also called general functions, are

In general, you can destroy this session by clicking on one of the "exit" buttons provided on the page. However, if the user does not click the Exit button, but directly close the browser, or disconnect the network, or power off the computer

What is a mutable variable? There is one other type of variable in PHP, "mutable variable." A mutable variable is a unique variant of PHP that allows you to dynamically change the name of a variable. How mutable variables work This feature works

Registering Session Sessions The use of Session variables in PHP, in addition to the need to start, but also through a registration process, register and read the session variable, all by accessing the $_session array to complete. Starting with

What are the functions of the PHP predefined constants? We can use the predefined constants of PHP to get the information in PHP, for example, we can use the current computer's operating system, the current PHP version information, and so on. Some

The data saved in the Cookie,session session file is created as a variable in the PHP script, and the session variable created can be referenced by a cross-page request within the life cycle (20 minutes). In addition, session sessions are stored on

What is a constant? Constants we can understand as the amount of constant value. Constants are defined so that they cannot be changed anywhere else in the program script. Methods for defining constants Constants are made up of English letters,

Features of Cookies Cookies are generated by the server and sent to User-agent (typically a browser), and the browser saves the key/value of the cookie to a text file in a directory, The next time you request the same Web site, the cookie is sent

What is a null value (NULL)? A null value, like its name, indicates that a variable has no value. A null value (NULL) is not case-sensitive, that is, NULL is the same as null or NULL. There are three scenarios in which null values are given in PHP:

Is this, I changed a site, on the home page plus an HTTP and HTTPS jump to each other button, home Test OK. (Home, gray icon for HTTP, green for HTTPS)(content page, cut to HTTPS, will force the use of HTTPS access, only to clean up the browser

Before we know this function, we need to insert some elements in front of the data to feel very complicated, to use the traversal to manipulate, or insert to the back, below we share a practical array_unshift () function, it can solve all problems.

Just installed Phpstorm running PHP file will be reported such errors? The solution is as follows: 1 Enter the PHP directory to find php.ini-development this file, rename him to PHP.ini 2 Open php.ini file to find Extension_dir Change the path

Problem: Recently in the development with Yii, his form verification function is also very powerful, but found that this ActiveForm form tool does not come, who can help explain under, thank you! Answer: I don't know if the main problem is a simple