PHP

* ** Generate verification code Image * publicfunctionactionVerfiycode () {Header (& amp; quot; Content-type: imagegif & amp; quot;); $ border0; whether border 1 is required: 0 don't $ how4; number of digits of the verification code $ w $ how * 15;

Functionstr_split_unicode ($ str, $ l0) {if ($ l & amp; gt; 0) {$ retarray (); $ lenmb_strlen ($ str, & amp; quot; UTF-8 & amp; quot;); for ($ i0; $ I & amp; lt; $ len; $ I + $ l ){... Function str_split_unicode ($ str, $ l = 0) {if ($ l> 0) {$ ret =

Since PHP5, the object model has been completely rewritten to get better performance and more features. This is the biggest change since PHP4. PHP5 has a complete object model. New features in PHP5 include access control, abstract classes and final

PHP5 supports abstract classes and abstract methods. Classes defined as abstract cannot be instantiated. If at least one method in a class is declared as abstract, the class must be declared as abstract. An abstract method only declares its call

Inheriting a well-known programming feature, PHP's object model also uses inheritance. Inheritance will affect the relationship between classes and objects. For example, when a class is extended, the subclass inherits all the public and protected

PHP does not need (or does not support) explicit type definitions in variable definitions. variable types are determined by the context in which the variable is used. That is to say, if a string value is assigned to the variable $ var, $ var becomes

This can already declare simple functions and return static or dynamic values. Define the INI option to declare an internal value or a global value. This section describes how to receive the value of parameters passed in from the call script (PHP

During development, there are often some simple tree-like storage, such as multi-level product classification and multi-level navigation menu. these objects have a feature that they usually obtain the entire tree structure. In the data... during

To implement multi-domain sharing sessions, you must first understand the operation mechanism of sessions. I will not talk about the basic concepts. Session runs like this: User A accesses Site Y. If Site Y executes session_start ();(... to

The while statement indicates that PHP repeats the nested loop statement as long as the while expression value is TRUE. The value of the expression is checked at the beginning of each loop, so even if the value changes in the loop statement, the

MySQL stored procedure is a new feature added from MySQL5.0. The main advantages of stored procedures are execution efficiency and SQL code encapsulation. Especially for SQL code encapsulation, especially when the business logic is complex. Now with

& Amp; lt ;! -- * @ Copyright (c) 2011 * @ author: Ernest * @ time: 2011 * @ version: new -- & amp; gt; & amp; lt ;? PhpclassVerifyImg {public $ fontSize15; defines the font size public $ length4; defines the string

As defined in the expression chapter, expr is evaluated by Boolean. If the value of expr is TRUE, PHP executes statement. if the value is FALSE, statement is ignored. For more information about which values are considered FALSE, see convert to a

& Amp; lt ;? Php * Utf-8, gb2312 support Chinese character truncation function cut_str (string, truncation length, start length, encoding); default encoding for UTF-8 start length is 0 * functioncut_str ($ string, $ sublen, $ start0, $ codeUTF-8)

Get Baidu's buzzword * @ user Xiaojie * @ fromwww.isharey.com? P354 * @ returnarray returns Baidu's buzzword data (array return) ***** get Baidu's buzzword * @ user Xiaojie * @ fromwww.isharey.com? P354 * @ returnarray .../** * Get Baidu's buzzwords

$ Aand $ bAnd (logical and) TRUE, if both $ a and $ B are TRUE. $ Aor $ bOr (logical OR) TRUE, if $ a or $ B is TRUE. Logical operators Example name result $ A and $ B And (logical and) TRUE, if both $ a And $ B are TRUE. $ A or $ B Or (logical

PHP supports an execution operator: backquotes (''). Note that this is not a single quotation mark! PHP will try to execute the content in the back quotes as shell commands and return the output information (that is, it can be assigned to a variable

1. search for character location function: strpos ($ str, search, [int]): search for the first position of search in $ str starting from int; stripos ($ str, search, [int]): the function returns the string for the first time in another string... 1.

Class, which is used to return $ a instances. classinstance {privatestatic $ a; staticfunctiongetA () {if (! Self: $ a) {self: $ anewa ();} returnself: $ ;... & quot; write a static method in the class to return the $ a instance, which can be called

Displacement is a mathematical operation in PHP. Bits removed from any direction are discarded. When the left shift is performed, the right side is filled with zero. when the symbol bit is removed, the plus and minus signs are not retained. When the