PHP Tutorials

Timestamp (timestamp), a complete, verifiable data that represents a piece of data that existed before a certain time, usually a sequence of characters that uniquely identifies a moment in time. Using digital signature technology to generate data,

One, this 1, to use this, you will have a situation of the image, otherwise it will error, Fatal error:using $this when the not in object context.2,this can call methods and properties in this class, or can call the adjustable methods and

file_get_contents-to read the entire file into a string File_get_contents () reads the entire file into a string. This function is the preferred method for reading the contents of a file into a string. If supported by the server operating system,

You cannot define a function in PHP that has the same name, or a method that cannot be defined in the same class, so there is no method overload. Objective Recently in the Thinkphp development project, the use of the parent:: keyword, in fact, the

FLV is the short name of Flash video, FLV streaming media format is a new video format, all called Flash video. Because it forms a very small file, loading speed is very fast, so that the network to watch video files become possible, it is effective

Recursive algorithm is a sub-problem that transforms a problem into a similar problem with reduced scale. The function (or procedure) is then called recursively to represent the solution to the problem. A procedure (or function) calls itself

PHP uses the Berkley socket library to create its connection. You can tell that the socket is just a data structure. You use this socket data structure to start a session between a client and a server. This server is always listening ready to

This article mainly introduces the PHP image to add the watermark function, combined with 2 simple examples to analyze the PHP implementation of the image watermark operation procedures and related skills, the need for friends can refer to the next

The Opendir () function opens a directory handle. If the function succeeds, it returns the directory handle resource. The failure returns FALSE. If the path is not a legal directory, or if the directory cannot be opened due to a license

PHP can use the magic constant file to get the absolute path of the current files, regardless of whether the current file is contained by other files, which is very useful in many cases, but sometimes when we read and write files and other

SWFUpload is a combination of flash and JS file upload Plugin Features of SWFUpload 1, upload with flash, the page does not refresh, and can customize the style of flash button; 2. You can restrict the files to be uploaded on the browser side; 3,

The PHP chroot () function changes the root directory of the current process to directory and changes the current working directory to "/". PS: This function requires root privileges and is only available on GNU and BSD systems only when using the

the Set_exception_handler () function sets the user-defined exception handling function. This function is used to create the user's own exception handling method during runtime. The function returns the old exception handler, or null if it

Our handling of errors in PHP is often used in the error_reporting function, The error_reporting () function kneels and you give the PHP error which should be reported. This function can set the error_reporting directive at run time. PHP has many

Strtotime () is a time function in PHP whose function is to convert date and time in any string form to the corresponding UNIX timestamp. Today, we analyze the performance problem of the Strtotime () function in detail by concrete

This article mainly introduces the PHP page Jump function Implementation method, the following to introduce how to achieve the current page data display number and how to achieve dynamic rollover function, the need for friends can refer to the next

Identity card number is a feature combination code, consisting of 17-bit digital body code and a check code. Order from left to right according to this: six-digit address code, eight-digit birth date code, three-bit digital sequence code and a

PHP does not have many inherited features. We rarely use this feature even if it is a programming language that supports multiple inheritance. In most people's view, multi-inheritance is not a good design method. To add an extra attribute to a class,

Introduce several methods of PHP traversal directory, you can traverse directory and directory files, for everyone to reference Traverse a directory or traverse a directory of files of a specified type, which is unavoidable for every child's shoe

In the language of learning PHP you will find that the method in PHP can not be overloaded, so-called method overloading is to define the same method name, through the "number of parameters" different or "parameter type" different, to access our