Found a total of 10000 related content
What is the difference between utf8 and utf8mb4 character sets in MySQL?
Article Introduction：MySQL's utf8 does not fully support UTF-8 encoding, while utf8mb4 supports it in full. Specifically, utf8 only supports up to 3 bytes of characters, and cannot correctly process 4-byte characters such as emojis, some rare Chinese characters and mathematical symbols, which may lead to data loss or errors; utf8mb4 supports all Unicode characters, accurately covering all symbols required for modern communications, and maintaining backward compatibility. Switching to utf8mb4 requires updating the character set of database, tables and columns, setting the connection character set, and repairing the converted data. In addition, you need to pay attention to whether the connection encoding, backup files and sorting rules match utf8mb4 to avoid potential problems.
2025-06-18
comment 0
550
How to reverse a string in PHP
Article Introduction：Inverting strings can be implemented in PHP through a variety of methods: 1. Use the strrev() function to quickly invert English strings, but are not suitable for multi-byte characters; 2. For strings containing Unicode characters such as Chinese, you can customize the mb_strrev() function, and use mb_strlen() and mb_substr() to operate according to characters to avoid garbled code; 3. You can also use array operations to split the string into an array, invert and then splice it. The logic is clear and suitable for teaching, but the performance may not be optimal. The appropriate method should be chosen for different scenarios.
2025-07-10
comment 0
962
how to convert a php array to a query string
Article Introduction：The core method of converting PHP arrays into query strings is to use the http_build_query function, which can automatically handle nested arrays and encoding problems; for simple structures, you can also manually splice them, but you need to pay attention to rawurlencode and ending symbol processing; in addition, characters such as spaces, Chinese and other characters in the parameters will be encoded, and the front and back ends need to uniform encoding specifications to avoid parsing errors. The specific steps are as follows: 1. It is recommended to use the built-in function http_build_query, which will automatically encode the key value and retain the index; 2. For simple arrays, you can manually traverse the splicing, but it needs to be used with rawurlencode; 3. Pay attention to the consistency of special characters in the query string, and you can use parse_
2025-07-07
comment 0
364
php date to timestamp
Article Introduction：There are two main ways to convert date strings to Unix timestamps in PHP. 1. Use the strtotime() function to be suitable for date strings in standard formats, such as "2024-12-2514:30:00", but the processing of non-standard or Chinese format is weak; 2. Use the DateTime::createFromFormat() method to accurately match the specified format, which is suitable for processing non-standard format data, such as user input or CSV data; 3. For date strings containing Chinese characters, they can be converted into standard format first through str_replace() or regular expression before parsing. When selecting a method, you need to judge based on the specific scene: use strto for simple scenes
2025-07-11
comment 0
1003
How to parse a float from a string in golang
Article Introduction：In Go, the most common way to parse a string into a floating point number is to use the ParseFloat function of the strconv package. 1. Use strconv.ParseFloat(s,64) to convert the string to float64. If float32 is required, you can pass in bitSize parameter 32; 2. Before conversion, it is recommended to use strings.TrimSpace to remove spaces or pre-check the input format to avoid errors; 3. ParseFloat supports scientific counting, but will return errors for illegal characters or incorrect strings; 4. Although fmt.Sscanf can also be used to implement similar functions, its error handling is not as clear as ParseFloat.
2025-07-11
comment 0
788
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
comment 0
800
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
comment 0
1430
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
comment 0
1046
Terraria: How To Make A Loom
Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make
2025-01-10
comment 0
1325
