PHP gives file information

This article will explain in detail how PHP formats rows into CSV and writes file pointers. I think it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. Format rows to CSV and write to file pointer Step 1: Open file pointer $file=fopen("path/to/file.csv","w"); Step 2: Convert rows to CSV string using fputcsv( ) function converts rows to CSV strings. The function accepts the following parameters: $file: file pointer $fields: CSV fields as an array $delimiter: field delimiter (optional) $enclosure: field quotes (

This article will explain in detail about changing the current umask in PHP. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. Overview of PHP changing current umask umask is a php function used to set the default file permissions for newly created files and directories. It accepts one argument, which is an octal number representing the permission to block. For example, to prevent write permission on newly created files, you would use 002. Methods of changing umask There are two ways to change the current umask in PHP: Using the umask() function: The umask() function directly changes the current umask. Its syntax is: intumas

This article will explain in detail the numerical encoding of the error message returned by PHP in the previous Mysql operation. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. . Using PHP to return MySQL error information Numeric Encoding Introduction When processing mysql queries, you may encounter errors. In order to handle these errors effectively, it is crucial to understand the numerical encoding of error messages. This article will guide you to use php to obtain the numerical encoding of Mysql error messages. Method of obtaining the numerical encoding of error information 1. mysqli_errno() The mysqli_errno() function returns the most recent error number of the current MySQL connection. The syntax is as follows: $erro

Question: How to get file size in C++? Answer: 1. Use the std::ifstream::tellg() member function to get the number of bytes read or written since opening the file stream; 2. Use std::filesystem::directory_iterator to traverse the files in the directory, and Use std::ifstream::tellg() to calculate the number of bytes in each file and add them up to get the total size.

This article will explain in detail how PHP determines whether a specified key exists in an array. The editor thinks it is very practical, so I share it with you as a reference. I hope you can gain something after reading this article. PHP determines whether a specified key exists in an array: In PHP, there are many ways to determine whether a specified key exists in an array: 1. Use the isset() function: isset($array["key"]) This function returns a Boolean value, true if the specified key exists, false otherwise. 2. Use array_key_exists() function: array_key_exists("key",$arr

This article will explain in detail to you the length of the string that matches the mask for the first time in the string returned by PHP. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. Get the length of the first substring in a string that matches the mask in PHP. In PHP, you can use the preg_match() function to get the first substring in a string that matches the given mask and return its length. The syntax is as follows: intpreg_match(string$pattern,string$subject,array&$matches=null,int$flags=0,int$offset=0):in

This article will explain in detail how PHP calculates the number of units or object attributes in an array. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. Count the number of cells in an array or the number of object attributes in array count($array): Count the number of cells in an array, including cells in nested arrays. sizeof($array): Equivalent to count().

Go and Node.js have differences in typing (strong/weak), concurrency (goroutine/event loop), and garbage collection (automatic/manual). Go has high throughput and low latency, and is suitable for high-load backends; Node.js is good at asynchronous I/O and is suitable for high concurrency and short requests. Practical cases of the two include Kubernetes (Go), database connection (Node.js), and web applications (Go/Node.js). The final choice depends on application needs, team skills, and personal preference.