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This article will explain in detail what is the use of define in php. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Define means "definition", is a built-in function in PHP, the function is to define a constant, the syntax is "define (constant name, value, $case_insensitive)"; the parameter "$case_insensitive" specifies whether the constant name is size-sensitive or not if it is true.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Define is a built-in function in PHP that defines a constant.

The so-called constant is a quantity that cannot be changed. Once a constant is defined in PHP, it cannot be modified or undefined.

Legal constant names can only start with letters and underscores, followed by letters, numbers, or underscores of any length. You can define a constant through the define () function in PHP. The syntax of the define () function is as follows:

The define ($name,$value, $case_insensitive) parameter describes that $name is required. Specifies the name of the constant. $value is required. Specifies the value of the constant. $case_insensitive

Optional. Specifies whether the name of the constant is case sensitive.

If set to true, it is not case-sensitive. The default is false (case sensitive).

Example:

Define a case-sensitive constant:

Define a case-insensitive constant:

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