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2025-04-04 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article mainly introduces how to use the define () function in PHP, which has a certain reference value, and interested friends can refer to it. I hope you will gain a lot after reading this article.
PHP constant
Constants are similar to variables, but once a constant is defined, it cannot be changed or undefined.
A constant is the identifier (name) of a single value. The value cannot be changed in the script.
Valid constant names begin with a character or underscore (the constant name is not preceded by a $sign).
Tip: unlike variables, constants are automatically global throughout the script.
Set PHP constant
To set a constant, use the define () function, which takes three parameters:
The first parameter defines the name of the constant
The second parameter defines the value of the constant
The optional third parameter specifies whether the constant name is case-sensitive. The default is false.
The following example creates a case-sensitive constant with a value of "Welcome to HuluMiao.cn!":
The following example creates a case-insensitive constant with a value of "Welcome to HuluMiao.cn!":
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