PHP: Hypertext Preprocessor - Formula Sheet

PHP Syntax and Operator Formulas

Below is a summary of standard syntax rules, data structure notations, and operator evaluations in PHP.

1. Standard Variable Assignment

Formula:

\(variable_name = value;

Definitions:

• \): Required symbol that initiates any variable declaration.
• variable_name: User-defined identifier starting with a letter or underscore.
• =: Assignment operator that transfers the right-hand value to the left-hand variable.
• value: The data being stored, which determines the automatic data type of the variable.

2. Concatenation and Concatenation Assignment

Formulas:

\(string3 = \)string1 . \(string2;

\)string1 .= \(string2;

Definitions:

• .: Concatenation operator that merges string operands into a single continuous string.
• .=: Concatenation assignment operator that appends the right-hand string to the left-hand variable.

3. Strict Identical Comparison

Formula:

\)result = (\(operand1 === \)operand2);

Definitions:

• ===: Identical operator. Returns true if value of operand1 is equal to value of operand2 AND their data types are identical.
• \$result: Boolean variable that stores the outcome (true or false).

4. Prefix and Postfix Arithmetic Operations

Formulas:

\(y = ++\)x; (Pre-increment)

\(y = \)x++; (Post-increment)

Definitions:

• ++\(x: Increments variable x by 1 first, then assigns the new value to y.
• \)x++: Assigns current value of x to y first, then increments x by 1.