| PHP provides some predefined attributes that can be used.
https://www.php.net/manual/en/reserved.attributes.php
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 Attributes
https://www.php.net/manual/en/language.attributes.php
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 PHP provides predefined variables that represent    external variables,    built-in environment variables, and other information about the execution    environment, such as the number and values of the arguments pass
https://www.php.net/manual/en/reserved.variables.php
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 Predefined Interfaces and Classes
https://www.php.net/manual/en/reserved.interfaces.php
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 See also the SPL Exceptions.
https://www.php.net/manual/en/reserved.exceptions.php
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 A constant is an identifier (name) for a simple value. As the name    suggests, that value cannot change during the execution of the    script (except for     magic constants, which aren t actually constants).    Con
https://www.php.net/manual/en/language.constants.php
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 Variables
https://www.php.net/manual/en/language.variables.php
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 Basic syntax
https://www.php.net/manual/en/language.basic-syntax.php
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 Control Structures
https://www.php.net/manual/en/language.control-structures.php
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 Enumerations
https://www.php.net/manual/en/language.enumerations.php
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