php predefined functions

An object is called when it is instantiated. When _ construct and a function with the class name coexist, __construct will be called, and the other will not be called. 1. magic functions (13) 1. _ construct () An object is called when it is

1. Magic Constants There are eight magic constants in PHP, and their values change as they change position in the code. These special constants are case insensitive. Line: Returns the current row number in the file. Can also be written in

Instance Remove the characters to the left of the string: "; Echo LTrim ($str, "Hello"); > Definition and usage The LTrim () function removes white space characters or other predefined characters to the left of the string. Related functions: RTrim ()

: 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

PHP pre-defined variable array 1, $_server The $_server Super global variable contains information created by the Web server that provides information about the server and client configuration and the current request environment. Depending on the

PHP/*//Definition $attr = Array (All-in-one), $attr [] = 1; $attr = Array ("One" = "Hello");//array value $attr[0]; $attr ["One"]//array traversal for () foreach () each () list ()*///4. Pointer Traversal/*$attr = Array ("One" = "aaaa", "one" =

Session variable ($_session): The data produced by the PHP session function is stored in the $_session variable in the form of a super global variable. 1. Introduction to Session Sessions are also called session periods, which are small pieces of

This article mainly sorts out the predefined interfaces of PHP, which are commonly used in the project process: IteratorAggregate (Iterator of aggregate Iterator), Countable, ArrayAccess, Iterator, you can refer to the following predefined