What are the basic PHP syntax requirements?

Basic PHP grammar requirements include grammar specifications, file structure specifications, variable and data type requirements, operator requirements, conditional statement specifications, loop statement specifications, function requirements, array requirements, file operation requirements, error handling, etc. Detailed introduction: 1. Grammar specifications, each line ends with ";", use "{}" to represent code blocks, use """" or "''" to represent strings; 2. File structure specifications, each PHP file usually Contains the code between the opening tags ""; 3. Variable and data type requirements, etc.

The operating environment of this tutorial: Windows 10 system, PHP8.1.3 version, Dell G3 computer.

Basic PHP grammar requirements include the following aspects:

1. Grammar specifications: PHP uses C language style grammar. Each line ends with a semicolon (;), curly braces ({}) are used to represent code blocks, and double quotes ("") or single quotes ('') are used to represent strings.

2. File structure: PHP programs are saved in files with the .php suffix. Each PHP file usually contains code between the opening tag ().

3. Variables and data types: PHP allows the use of variables to store and manipulate data. Variables can be used directly without declaration and can save different types of data, such as integers, floating point numbers, strings, etc.

4. Operators: PHP supports common arithmetic, assignment, comparison, logic and other types of operators. For example, addition operator ( ), assignment operator (=), equal operator (==), etc.

5. Conditional statements: Commonly used conditional statements in PHP include if statements and switch statements. The if statement executes the corresponding code block based on the true or false condition, and the switch statement selects different branches based on the value of the expression.

6. Loop statements: PHP provides a variety of loop statements such as while, do-while and for for repeatedly executing a piece of code. These loop statements determine whether to continue execution based on whether the condition is met or not.

7. Function: A function is a reusable piece of code used to implement a specific function. PHP supports two types of custom functions and built-in functions. Custom functions can receive input values, perform specified operations, and return output results.

8. Array: Array is a special data type used to store multiple values. PHP provides two types of arrays: indexed arrays and associative arrays. Indexed arrays use numbers as keys, and associative arrays use strings as keys.

9. File operation: PHP can read and write files and operate the file system. Through file operation functions, you can open, create, delete, copy, move files, etc.

10. Error handling: PHP provides an error handling mechanism. When an error occurs while the program is running, you can use the try-catch statement to capture and handle the exception.

These are the basic PHP syntax requirements. If you are proficient in these syntax specifications and syntax requirements, you can write PHP programs with complete functions and strong maintainability.

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