Insufficient foundation in PHP written test? Grab these key knowledge points!

Insufficient foundation in PHP written test? Grab these key knowledge points!

PHP is the most widely used server-side scripting language and is widely used in website development and application programming. Many companies will conduct written tests to screen candidates when recruiting PHP developers, so it is crucial to have a certain basic knowledge of PHP. If you find that the foundation is insufficient in the PHP written test, don't worry. This article will summarize some key knowledge points for you to help you become more comfortable in the written test.

1. PHP basic syntax
   In PHP, statements end with a semicolon (;), variables start with the $ symbol, and strings can be expressed with single quotes (') or double quotes (") .In addition, when PHP code is embedded in HTML, you can use tags to separate it.
2. Data Type
   There are many data types in PHP, including integers (integer) , floating point (float), string (string), boolean (boolean), array (array), etc. Understanding the characteristics and usage of various data types is very important for correct data processing.
3. Variables and Constants
   In PHP, variables are defined using the $ symbol, while constants are defined using the define() function. Understanding the concepts, scope and naming conventions of variables and constants is the foundation of PHP programming.
4. Operator
   PHP supports a variety of operators, including arithmetic operators ( , -, *, /), comparison operators (==, !=, >,
5. Process Control
   in PHP Process control includes if statements, switch statements, for loops, while loops, foreach loops, etc. Understanding the syntax and applicable scenarios of various process control structures can make the program clearer and more efficient.
6. Function
   The function is Important programming elements in PHP can be used to encapsulate specific functions and improve code reusability and maintainability. Mastering the definition, calling, parameter transfer and return value of functions is the key to improving PHP programming capabilities.
7. Array
   The array in PHP is a special variable that can store multiple values. Understand the types of arrays (index arrays, associative arrays, multidimensional arrays), common operations (traversal, addition, deletion, sorting), etc. Content is crucial for processing complex data structures.
8. File Operation
   In PHP, file input and output is one of the common operations. Master the opening, reading, writing, closing and other operations of files as well as file upload, Technologies such as downloading can provide more possibilities for website development and data processing.
9. Error handling
   In actual development, error handling is an inevitable part. Understand the error types and error reporting levels in PHP , exception handling mechanism and other contents can help you better debug and optimize the code.
10. Object-oriented programming
    Object-oriented programming is an important concept in PHP and can help you better organize and manage the code. It is very important to master the basic concepts of object-oriented programming such as classes, objects, properties, methods, etc.

To sum up, mastering the above key knowledge points is the key to improving PHP programming capabilities. If you find that in the PHP written test If you don’t have enough basic knowledge, you might as well spend some time to systematically study and practice these knowledge points. I believe you will be able to handle it in future written examinations and practical work. come on!

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