versacheck checks

Php checks whether the file exists by using file_exists or is_file. According to the difference between file_exists and is_file and is_dir in PHP, we can basically understand file_existsis_dir + is_file in PHP. Write program verification: execute 1000 times, record the time required to read the difference between file_exists and is_file and is_dir in PHP. basically, PHP's file_exists = is_dir + is_file. Write a program to verify it: Execute 1000 tim

Checks whether a file exists. The following parameter is provided: File Name (must contain path and file name ),CodeAs follows: /* Function: Check whether the file exists @ filename: the full path (path and file name) of the file to be detected. It must be an absolute path */bool cfilecheckdlg: isfileexist (cstring filename) {cfilefind ffind; return ffind. findfile (filename );} Note:It has not been detected. If the input parameter is just a file na

{Author: cxgAutomatically checks for network disconnection and prompts for automatic Reconnection} Unit clienttestconnected; Interface UsesSysutils, classes, sqlexpr, unetcommon; type twaitthread = Class (tthread) private {private Declarations} fnetconnect: Boolean; fcheckinterval: integer; fmsg: string; protected procedure showmsg; procedure execute; override; procedure serveropen; procedure serverclose; function connremotesvr (CN

// Globally define the page opened by the parameter and the detection time VaRNewwindow; VaRTimer; FunctionOpenWindow(PATH ){ Newwindow = Window. Open (null,Null,Null ", null", toolbar = No, menubar = No, scrollbars = Yes, resizable = No, location = Yes, status = no ;"); Timer = setinterval ('Updateafterclose ()', 1000 );// Check whether the subwindow is closed every second } // The parent window checks whether the child window is c

JS Regular Expression matching checks various numeric types (digit verification) and js Regular Expressions Regular Expression set for verifying numbers Verification number: ^ [0-9] * $ Verify the n-digit number: ^ \ d {n} $ Verify at least n digits: ^ \ d {n,} $ Verify m-n digits: ^ \ d {m, n} $ Verify the number starting with zero or zero: ^ (0 | [1-9] [0-9] *) $ Verify the positive number of two decimal places: ^ [0-9] + (. [0-9] {2 })? $ Verify th

Php checks whether the remote file exists and determines whether the remote file has functionremote_file_exists ($ url) {$ executeTimeini_get (max_execution_time); ini_set (max_execution_time, 0 ); $ headers @ get_headers ($ url php determines whether a remote file exists // Determine whether the remote file has function remote_file_exists ($ url) {$ executeTime = ini_get ('max _ execution_time '); ini_set ('max _ execution_time', 0 ); $ headers =

Php checks whether the string contains digits if (preg_match ('/\ d +/', $ id) echo 'y'; elseecho 'n'; I can see this code online, however, a mistaken man, Dong Yanyan, 2-7-14, yundun district, was determined not to contain the number. in Yudu city, Zhulin town, 549-1, php, determined whether the string contains numbers. If (preg_match ('/\ d +/', $ id) echo 'y'; else echo 'n '; I saw this code on the Internet, but I was mistaken. Dongyan 2-7-1

JS checks whether jquery is loaded and dynamically loaded Function loadjscssfile (filename ){VaR fileref = Document. createelement ('script') // create a tagFileref. setattribute ("type", "text/JavaScript") // defines the attribute type value as text/JavaScriptFileref. setattribute ("src", filename) // file addressDocument. getelementsbytagname ("head") [0]. appendchild (fileref)}If (typeof jquery = 'undefined '){// Jquery is not loadedAlert ('kaishi

JQuery checks whether the checkbox (check box) is selected:If ($ ("# id"). attr ("checked") = true) JQuery implements checkbox (check box) selection, full selection/deselection code:Copy codeThe Code is as follows:

JavaScript checks the size of uploaded files. This example describes how to check the size of uploaded files by using JavaScript. Share it with you for your reference. The details are as follows: The JS client Code restricts the size of files uploaded by users. However, client verification is only auxiliary, and the server must perform verification again. I hope this article will help you design javascript programs.

JQuery checks whether code sharing exists for an element. jquery code The code may be able to perform different operations based on the existence of elements, so you need to determine whether the specified element exists. $ (Selector) can be used to obtain a set of matching elements, while the length attribute of a set of matching elements can be used to obtain the number of matching elements in the set. Therefore, you only need to determine whether

General js method: checks whether the browser has installed the specified plug-in (IE and non-IE) /** Check whether the specified plug-in has been installed ** pluginName plug-in name */function checkPlugins (pluginName) {var np = navigator. plugins; if (window. activeXObject) {// IE // ActiveXObject Object Name var activexObjectName = pluginName + ". "+ pluginName; try {var axobj = eval (" new ActiveXObject (activexObjectName); "); // convert an obj

JavaScript checks whether a number is an integer or a floating-point number. This example describes how to use JavaScript to check whether a number is an integer or a floating-point number. Share it with you for your reference. The details are as follows: Check whether it is an integer: 1 2 3 4 5 6 7 Function isInt (n ){ Return typeof n = 'number' n % 1 = 0; } // Or, this support ie3 Function isInt (n ){ Return typeof n = '

Js checks whether the image is loaded and implements pre-download of the image Create an Image object to pre-download the Image. If the Image already exists in the browser cache, directly call the callback function and use the onload event to determine whether the Image is loaded. 01 Function loadImage (url, callback ){ 02 Var img = new Image (); // create an Image object to implement pre-download of the Im

Javascript checks the image size and does not make large images break the page. You only need to write a simple function to determine the image size using Javascript. Of course, many people may not know how to write this function. I found that using ASP to determine the image size is more complicated than that of taobaomao. When I judge the image size, I still need to display it logically... Annoying. It is easy to use Javascript to judge and solve th

Javascript checks whether objects are equalEquality operations in Javascript include "=", "=", and so on. There is no need to make a majority of the differences between the two. This article will explain how to determine whether two objects are equal in the future? You may think that if two objects have the same attributes and their attributes have the same values, the two objects will be equal. The following example demonstrates how var obj1 = {name:

The perfect 2 php checks whether the string is a UTF-8 encoded function. Transcoding functions such as iconv () and mb_convert_encoding () are sometimes used in php development. When using function transcoding or decoding, we sometimes need to determine the current string encoding type first, it is better to determine whether it is UTF-8 encoding. If yes, then perform encoding conversion and other operations. Below is a small series of finishing the c

Example of how PHP checks whether the system has been installed in CMS This article describes how to use PHP in CMS to determine whether the system has been installed. For more information, see Many common CMS systems today have installation programs. For the convenience of users, the new downloaded system will determine whether the CMS system has been installed before use, if the installation is complete, a prompt is displayed, which does n

When registering a user on any website, the system checks whether the user already exists. A long time ago, the processing method was to submit all the data to the server for verification. Obviously, this method had a poor user experience. Later, with Ajax, Asynchronous interaction, when the user enters the user name and continues to fill in other information, Ajax sends the information to the server to check whether the user name has been registered.

Checks whether the URL address has a response and the URL address response. Today, a problem suddenly occurred. The program is stuck due to the URL address call (the reason is that the service is suspended and the disk is broken) Then I thought about it. Before calling the URL address, I should judge whether the address has a response. Can this solve the problem? C # code: ///