PHP

1. unset ($_session[' xxx ') deletes a single session,unset ($_session[' xxx ')) to unregister a registered session variable. The effect is the same as Session_unregister (). Session_unregister () has been discarded in the PHP5. Unset ($_session)

A relatively simple php file Upload example, can be used when the request is not high, recorded here, convenient later to use when directly over the copy. $resume = $_files[' Resumefile '];if ($resume [' name ']!= '){$enableType = array (' jpg ', '

In some applications we need to dynamically display data, such as current online numbers, current total transactions, current exchange rates, and so on, front-end pages need real-time refresh to get the latest data. This article will be combined

First, the file upload 1, client settings: (1), in Label Enctype and method two properties to indicate the corresponding values. Enctype= "Multipart/form-data"; Method= "POST" (2), form form to set up a hidden type of input box, where the value

Classification of operators 1, by the number of operations classification 1.!true//Unary operators2. $a + $b//two-dollar operator3.true? 1:0//ternary operator 2, according to the function classification (1) Arithmetic operators1.+ 、-、 x,/,%

Example. The code is as follows Copy Code $test = 0;if ($test = = ") {Echo ' in php, 0 is empty '; is output}if ($test = = = ") {Echo ' in php, 0 is empty '; Not to be output}if ($test ==null) {Echo ' in php, 0 is

Pass Value: The function parameter pressure stack is a copy of the parameter. Any modification is a function on the copy and does not work on the original variable. Pass Reference:The press stack is a copy of the reference. Because a reference is

The PHP design pattern has the following Memo Mode (Memento mode) Observer mode (Observer mode) Template approach mode (Template method mode) Command mode (commands mode) Synthetic mode (composite mode) Enjoy meta mode (Flyweight mode) Policy

One: Sequential structureTwo: Branch structure (conditional structure, selection structure)1. One-way branch:Conditions: bool,true or false,> if (condition)Execute one of the following statementsif (condition){Code Snippets:Code

Here are a few ways to jump: One of the most common methods on the Web: The code is as follows Copy Code $url = $_get[' url '];Header ("Location: $url");?> Put this code in a folder, named for example go.php

Share a method to meet these two conditions at the same time, not only to facilitate the Web site program error debugging, but also does not affect the normal operation of the site debugging methods. Copy the following PHP statement to the top of

One, about Taobao IP address library The services we currently offer include: 1. According to the IP address provided by the user, the geographic and geographic information of the IP address is quickly queried, including the state, province, city

/Foreground Paging functionfunction multi ($num, $perpage, $curpage, $mpurl, $maxpages = 0, $page = ten, $autogoto = TRUE, $simple = FALSE) {Global $maxpage;$ajaxtarget =!empty ($_get[' ajaxtarget '))? "Ajaxtarget=" ". Htmlspecialchars ($_get['

In asp,.net, date addition minus is a fairly simple datediff function to calculate how long the difference between two dates is, and when I learn PHP I think so, but completely different from what I think, the following is a friend wrote Php date

Require DirName (__file__). '/moophp/moophp.php ';Define (' Gmag ', 0xe6359a60); Note to obtain and process variables that may be obtained$site = MOOGETGPC (' site ', ' string ');$host = ';$style = isset ($_get[' style ')? $_get[' style ']:1;$host =

$lianjie = mysql_connect ("localhost", "root", "Xiaolie") or Die ("Connection failed");mysql_query ("Set names UTF8");if ($lianjie){mysql_select_db ("Xiaolie");if (!@$_get["id"]){$jieguo = "SELECT * from Zhuce";$fasong = mysql_query ($jieguo) or Die

? Php $countfile = "Num.txt";Defines that the file written by the counter is count.txt under the current directory, and then we should test whether the file can be openedif ($fp = fopen ($countfile, "r+")) = = False) {//Open file in read-write mode,

Definition and usageThe explode () function separates strings into arrays.SyntaxExplode (separator, string, limit)ExampleIn this example, we split the string into an array: The code is as follows:Copy code $ Str = "Hello world. It's a beautiful

Strtr (string, from,)Or strtr (string, array)First, the first method for strtr functionsLet's take a look at the example below: The code is as follows:Copy code Echo strtr ("I Love you", "Lo", "lO ");?>The result is:1 I lOve yOu This result

*/$ Hash_list = hash_algos (); // return the registered hash rule listPrint_r ($ hash_list); // display the result/* Create a file to calculate the hash value */File_put_contents('example.txt ', 'The quick brown fox jumped over the lazy dog .');/*