• PHP Constants
    Constants are like variables, except that once they are defined they cannot be changed or undefined. PHP Constants A constant is an identifier (name) for a simple value. The value cannot be changed during the script. A valid constant name starts with a letter or underscore (no $ sign before the constant name). Note: Unlike variables, constants are automatically global across the...
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  • PHP Magic Constants
    PHP Predefined Constants PHP has nine predefined constants that change value depending on where they are used, and therefor they are called "magic constants". These magic constants are written with a double underscore at the start and the end, except for the ClassName::class constant. Magic Constants Here are the magic constants, with descriptions and examples: Constant...
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