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English
In PHP 7.1 and above, socket_clear_error() is a function specifically used to clear the error state of a given socket resource. It belongs to PHP's Sockets extension and is usually used to manage socket errors during network programming.
Sokcet_clear_error() is to "reset" the error state of a socket. Because when an error occurs in the socket, it will save the error message internally, affecting subsequent operations. Calling this function can clear the error, ensuring that subsequent use of the socket is not affected by the previous error status.
int socket_clear_error(resource $socket, int $mode = 0)
$socket
The wrong socket resource needs to be cleared.
$mode (optional)
Error type flag, default is 0.
0 means clear all errors (default).
1 Clear the send error (SO_ERROR_SEND).
2 Clear only the receive error (SO_ERROR_RECV).
The return value is an integer indicating the cleared error code, and 0 indicates no errors.
<?php
// Create a TCP socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// Connect to the server
socket_connect($socket, 'm66.net', 80);
// Suppose some errors are happening here，We can get the current error first
$error = socket_last_error($socket);
echo "Current error code: $error\n";
// Clear error
$clearError = socket_clear_error($socket);
echo "Cleared error code: $clearError\n";
// closure socket
socket_close($socket);
?>
In the example above, we first use socket_last_error() to get the error code of the current socket, and then use socket_clear_error() to clear it. The return value is the error code that was cleared.
Clean up after error detection : It is usually called after the socket error is captured or processed to ensure that subsequent operations are not affected.
Scope of application : It is only useful if the Sockets extension is enabled and socket programming is used.
Coupled with : often used in combination with socket_last_error() and socket_strerror() for easy debugging.
sokcet_clear_error() is a simple but practical tool function that helps you manage the error status of socket connections and avoid network communication exceptions due to error accumulation. Using it correctly can improve the robustness of your PHP socket program.
