PHP define () function

PHP Some basic knowledge of the record

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PHP define () function

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Definition and usage

The Define () function defines a constant.

Constants are similar to variables, except that:

• After setting, the value of the constant cannot be changed
• Constant name does not need to start with dollar sign ($)
• Scope does not affect access to constants
• A constant value can only be a string or a number

Grammar:

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Define (name,value,case_insensitive)

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Parameter description

Name	Necessary. Specifies the name of the constant.
Value	Necessary. Specifies the value of the constant.
Case_insensitive	Optional. Specifies whether the name of the constant is case sensitive. If set to true, the case is not sensitive. The default is False (case sensitive).

Example

Example 1

Define a case-sensitive constant:

 
  Define ("greeting", "Hello world!"); ECHO constant ("greeting");? >

Output:

Hello world!

Example 2

Defines a case-insensitive constant:

 
  Define ("greeting", "Hello world!", TRUE); Echo constant ("greeting"); >

Output:

Hello world!

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