OOP (Object Oriented Programming)
Parsing - A process by which programming data is broken into smaller, more distinct chunks of information that can be more easily interpreted and acted on.
OOP (Object Oriented Programming) -
Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive.
Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*'
A storage location with a name that can be
assigned a value.
www.pcai.com/web/glossary/pcai_p_s_glossary.html
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). A constant is case-sensitive by default. By convention, constant identifiers are always uppercase.
The name of a constant follows the same rules as any label
in PHP. A valid constant name starts with a letter or underscore, followed by
any number of letters, numbers, or underscores. As a regular expression, it
would be expressed thusly: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*
A string is series of characters. In PHP, a character is the same as a byte, that is, there are exactly 256 different characters possible. This also implies that PHP has no native support of Unicode. See utf8_encode() and utf8_decode() for some Unicode support.
An integer is a number of the set Z = {..., -2, -1, 0, 1, 2, ...}.
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