PHP

As we all know, reducing the size of code during transmission can increase the page transmission speed and speed up opening the page. This is based on the bandwidth bottleneck theory. Of course, the server speed is affected by many other factors,

This is an article about the meaning of special characters in regular expressions. Character/Meaning: For characters, it usually indicates the literal meaning, indicating that the subsequent characters are special characters, not explained.For

I am checking a problem today. I failed to extract the content from the string using regular expressions. I checked the strings and regular expressions repeatedly. I wrote a small script for testing. There is no problem. I went back to the Code for

/*Chinese character truncation functions supported by Utf-8 and gb2312Cut_str (string, truncation length, start length, encoding );The default encoding format is UTF-8.The default start length is 0.*/ Function cut_str ($ string, $ sublen, $ start = 0

Cookie comprehension:Cookie is a gift (small dessert) left by the server to the client to complete the server's authentication of the user.Specifically, when a user logs on to the server, the server uses the setCookie function in the browser of the

/*** Verification Code* Chaojie2008@126.com* 2012-02-09**/Class Vailimg {Private $ width; // The image width of the verification code.Private $ height; // height of the Verification Code ImagePrivate $ codeNum; // number of characters in the

/*** Read cache. The default value is File Cache. The cache configuration is not loaded.* @ Param string $ name cache name* @ Param $ filepath: data path (Module name) caches/cache _ $ filepath/* @ Param string $ config configuration name*/Function

$ Str = '123456789abcdefg of the People's Republic of China ';Echo preg_match ("/^ [u4e00-u9fa5_a-zA-Z0-9] {3, 15} $", $ strName );    Run the above Code to see the prompt information? Warning: preg_match (): Compilation failed: PCRE does not

PHP uses the GD library for screenshot capturePHP5.2.2 and later versions of the GD library implement two screenshot functions: imagegrabscreen and imagegrabwindowIt is used to intercept the entire screen and intercept a window (same as ALT +

In php, we can use the array_search () function to find the key name of the element value in a number group. Similarly, we can use the binary method to find the key names of elements in the array.So what is a binary classification? Let me explain:If

In php, session data is stored on the disk as files by default, which may already meet the requirements of small websites. For large and medium-sized websites or websites with special requirements, the default storage method cannot meet the

In this article, you can know how to use the basics of session. After reading this article, you may have learned the basic usage of the session! PHP Session variable When you run an application, you open it, make some changes, and then close it.

Code for randomly generating numbers and letters: // Che. phpSession_start ();For ($ I = 0; $ I {$ Rand. = dechex (rand (1, 15 ));}$ _ SESSION ['check _ num'] = $ rand;$ Image = imagecreatetruecolor (50, 30 );$ Bg = imagecolorallocate ($ im, 0); //

Array_intersect_assoc () carries the index check to calculate the intersection of Arrays [Function] This function returns an array,This array contains all values in the array of array1 but not in any other parameter.Note that, unlike the

The array_diff_key () function uses the key name to compare the difference set of the calculated array. [Function]This function returns an array,This array contains all the key names in the array of array1 but not in any other parameter.Scope of use]

Array_count_values () function [Function]This function returns an array,This array uses the value in the input array as the key name,The number of times this value appears in the input array.Scope of use]Php4 and php5[Use]Array array_count_values

Paging ideas:You only need to get two variables to get half done:1. Number of records to be displayed per page $ pageSize2. Total data volume in the table $ rowCountWith the above two variables, we can get a total of several pages. $ pageCountThen,

[Html]1. instance: [Html]1. $ content = "ceshi ";2. $ technicalemail = "www.2cto.com ";3. $ headers = "From: =? UTF-8? B? ". Base64_encode ('chenglong ')."? = \ r \ n ";4.5. $ content = strip_tags ($ content );6. $ a = @ mail ($ technicalemail, '=?

Delegation ModeBy assigning or entrusting other objects, the delegated design mode can remove the judgment and complex functions of the core objects.Application scenariosA cd class is designed, which includes mp3 and mp4 Playback modes.Before

Appearance ModeBy creating a simple appearance interface before the set of required logic and methods, the appearance design mode hides the complexity of calling objects.The appearance design mode is very similar to the builder mode. The Builder