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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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Variables
https://www.php.net/manual/en/language.variables.php
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References Explained
https://www.php.net/manual/en/language.references.php
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Language Reference
https://www.php.net/manual/en/langref.php
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Expressions are the most important building blocks of PHP. In PHP, almost anything you write is an expression. The simplest yet most accurate way to define an expression is anything that has a value .
https://www.php.net/manual/en/language.expressions.php
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PHP provides some predefined attributes that can be used.
https://www.php.net/manual/en/reserved.attributes.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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Attributes
https://www.php.net/manual/en/language.attributes.php
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