What does php errno mean?-PHP Problem-php.cn

PHP errno is a constant indicating a system error code. errno represents the error code returned by the system call. This error code will tell us what problem occurred and the cause of the problem.

The commonly used values of errno and their meanings are as follows:

0: No error
1: The operation is not allowed
2: File and Directory does not exist
3: Unable to open file or directory
4: I/O error
5: Insufficient storage space
6: File permission error
7: The file already exists
8: The file name already exists
9: The file cannot be deleted
10: The resource has been locked
11: Resource in progress
12: Resource timeout
13: Resource has expired
14: The connection has been reset
15: The user has canceled the connection
16: Unable to connect to the remote host
17: Unable to create a network connection
18: The network connection has been disconnected
19 : Network connection timeout

PHP errno is very important because it can help programmers determine errors encountered when executing code. By checking error codes, developers can quickly locate problems and take appropriate action.

In PHP, errno is set by calling system functions. For example, if you are having trouble opening a file, errno will be set to the error code. Likewise, a similar situation occurs if you are trying to connect to a network resource and encounter problems.

If you want to use errno in PHP, you can use the following function:

errno(): Get the current system error code.
strerror(): Convert the system error code into the corresponding error string description.

The following is a sample code using the errno function and strerror function:

Copy after login

In the above example, if the file test.txt does not exist, the error message will be displayed along with the corresponding errno and error description.

In short, errno is a very useful system call error code in PHP. Use it to help developers quickly locate problems and take necessary actions. It is recommended that when using errno, you should be careful and conduct sufficient testing and debugging to ensure that all possible errors can be caught and handled.

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