php if class exists

1.php determine whether a system function or a function written by itself existsBOOL Function_exists (string $function _name) determines whether a function has been defined, for example:if (function_exists(' Curl_init ')) { curl_init ();} Else {

: This article mainly introduces php programming notes. if you are interested in PHP tutorials, please refer to them. Three methods for php to obtain POST data Php image watermarking source code Php + ajax + json is the simplest example. Php Chinese

Php programming notes-three methods for obtaining POST data from small_123 php Php image watermarking source code Php + ajax + json is the simplest example. Php Chinese character to pinyin source code Php traverses the Directory, generates the md5

Three ways to get post data from PHP PHP image plus watermark source code One of the simplest examples of Php+ajax+json PHP Chinese Pinyin Source code PHP iterates through directories, generates MD5 values for each file in the directory, and writes

One: Structure and invocation (instantiation): Class classname{}, calling: $obj = new ClassName (), and when the class has a constructor, it should also pass in the argument. such as $obj = new ClassName ($v, $v 2 ...); Two: Constructors and

I. Structure and call (instantiation): classclassName {}, call: $ obj = newclassName (); when a class has a constructor, you should also input parameters. For example, $ obj = newclassName ($ v, $ v2 & hellip;); 2: constructor and Destructor: 1.

1. Structure and call (instantiation ): Class className {}, call: $ obj = new className (); when the class has a constructor, you should also input parameters. For example, $ obj = new className ($ v, $ v2 ...); 2. constructor and destructor:1.

PHP Functions: Empty () and isset () are the functions that determine whether a variable has been configured, but there are certain differences when used. The empty () function is used to test whether a variable has been configured. Returns a value

fopen () method The simplest way is to use fopen (), to see if the file can be opened, can hit the file of course exists. The fopen () function opens the file or URL. If the open fails, the function returns FALSE. Syntax: fopen

To do PHP development, if you encounter their own can not modify the server related configuration can not know whether some of the server functions are open, the direct use of certain special functions can cause programs to error, such as curl_init