Let's talk about the difference between PHP syntax and C language

On the road of learning as a programmer, many people will be exposed to multiple languages, among which PHP and C are two of the more common languages. Both languages ​​are very important, but their usage and syntax are different. Today we will take a deeper look at the differences between PHP syntax and C language.

1. Introduction

PHP and C language are both programming languages. C is a compiled language that is widely used for system-level programming, such as operating system development, while PHP is an interpreted language that was originally designed for creating dynamic web pages.

2. Program structure

In C language, a program consists of one or more functions, and each function has a main function as the entry point. In PHP, a script is used, there is no display entry, and it can be combined with the HTML page by using a separate file.

3. Variables

In C language, all variables must be defined at the beginning of the function and must be defined before use. In PHP, variable definitions do not need to be at the beginning, but can be defined anywhere.

In addition, the variable type in C language must be specified at the time of definition, and each variable must have a type, while in PHP, variables do not need to specify a type, it will automatically infer the variable based on the assigned value type.

4. Array

Arrays in C language are type-defined at the time of definition, and do not support string or object types. An array in PHP is a more advanced data type that contains key/value pairs. Arrays in PHP also support string or object types.

5. File processing

In C language, file operations need to use the fopen() function to open the file, use the fread() function to read the file content, and use the fwrite() function to write the content. , and finally use the fclose() function to close the file. But in PHP, these operations are encapsulated in file-related functions, such as the file_get_contents() function to read the file contents, and the file_put_contents() function to write the contents, and there is no need to specifically open and close the file.

6. Function

When defining a function in C language, you must specify the type of return value, but functions in PHP do not. At the same time, functions in C can accept parameters, while functions in PHP can accept any number of parameters.

7. String operation

In C language, a string is a character array represented by a pointer and terminated by null. You need to use the strcpy() function to copy the string and strcat. () function performs string concatenation. In PHP, string is a more advanced data type that can be calculated like integer and float, and the splicing character "." is used to splice strings.

To sum up, although PHP language and C language are both languages ​​that programmers often need to come into contact with, their grammatical structures are still very different. The appropriate language needs to be chosen based on specific needs. Whether it is C language or PHP language, continuous learning and accumulation are required in order to better utilize its functions and features.

The above is the detailed content of Let's talk about the difference between PHP syntax and C language. For more information, please follow other related articles on the PHP Chinese website!