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PHP: Enumerations - Manual

https://www.php.net/manual/en/language.enumerations.php

Enumerations

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PHP: Namespaces - Manual

https://www.php.net/manual/en/language.namespaces.php

Namespaces

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PHP: Functions - Manual

https://www.php.net/manual/en/language.functions.php

Functions

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PHP: Control Structures - Manual

https://www.php.net/manual/en/language.control-structures.php

Control Structures

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PHP: Operators - Manual

https://www.php.net/manual/en/language.operators.php

Operators