Summary of usage of PHP defined () function

The Define () function defines a constant.define () functions: Defines a constant. Constants is much like variables, except for the following differences: constants [constant] and variables [variable] There are many similarities, so it is easy to confuse; Let's enumerate the differences between constants [constant] and variables [variable]: A constant's value cannot be changed after it is set a constant value cannot be changed after it has been specified; constant NA Mes does not need a leading dollar sign ($) When setting constants, it is not necessary to precede the "$" symbol; Constants can B

1. Detailed usage of the PHP define () function and the defined () function _php Tutorial

Summary: Drill down into the PHP define () function and the usage of the defined () function. The Define () function defines a constant. The purpose of the Define () function is to define a constant. Constants is much like variables, except for the following differences: constant [Constan

2. Explore the PHP define () function and defined () function using the _php tutorial

Introduction: Explore the PHP define () function and the defined () function using a detailed explanation. The Define () function defines a constant. The purpose of the Define () function is to define a constant. Constants is much like variables, except for the following differences: constant [Constan

3. Examples of defined () and STRRCHR () functions in PHP _php tutorial

Summary: an instance of the defined () and STRRCHR () functions in PHP. The defined () function defines and uses the defined () function to check if a constant exists. Returns true if the constant exists, otherwise false is returned. Example: Php define (Greeting,hello world!);

4. Front-end learning PHP constants, learn PHP constants _php Tutorial

Introduction: The Front-end learning PHP constants, learn PHP constants. Front-end learning PHP constants, Learning PHP Constants directory [1] constant definition [2] Custom constants [3] System constants [4] constant values [5]defined () constants define constants like variables, but constants once determined

5. PHP basic-define with defined function

Introduction: Use of PHP base-define and defined functions??? Define ("Test_attr", "hhhhhhh");??? Echo test_attr;? Define is equivalent to constant in Java to define a constant; the defined () function checks to see if a constant exists. Returns true if the constant exists, otherwise false is returned. Defi

6. PHP const define () constant (), defined ()

Description: PHP constant define () constant (), defined () Define―― define constants, if true, case-insensitive bool Define (string name, mixed value [, BOOL case _insensitive]) constants can only contain scalar data (boolean,integer,float

7. Front-End learning PHP constants

Summary: Front-end PHP Constants directory [1] constant definition [2] Custom constants [3] System constants [4] constant values [5]defined () constants define constants like variables, but constants cannot be changed or revoked once defined. The main function of constants is to avoid duplicate definitions, tamper with variable values, and improve code maintainability. Valid constant names begin with a character or underscore (there is no $ symbol in front of the constant name). In general, constants are all capitalized. Constants in PHP are divided into custom constants and systems often

8. Explore PHP define () function and defined () function using the detailed

Introduction: Explore the PHP define () function and the defined () function using a detailed explanation. The Define () function defines a constant. The purpose of the Define () function is to define a constant. Constants is much like variables, except for the following differences: constant [Constan

9. Examples of defined () and STRRCHR () functions in PHP

Summary: an instance of the defined () and STRRCHR () functions in PHP. The defined () function defines and uses the defined () function to check if a constant exists. Returns true if the constant exists, otherwise false is returned. Example: Php define (Greeting,hello world!);

PHP basic-define and the use of defined functions

Introduction: Use of PHP base-define and defined functions??? Define ("Test_attr", "hhhhhhh");??? Echo test_attr;? Define is equivalent to constant in Java to define a constant; the defined () function checks to see if a constant exists. Returns true if the constant exists, otherwise false. Define ("GREET

"Related question and answer recommendation":

Php-defined () or define (); What does that mean?