(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_read — Reads a maximum of length bytes from a socket
socket_read ( resource $socket , int $length [, int $type = PHP_BINARY_READ ] ) : string
The function socket_read() reads from the socket resource socket created by the socket_create() or socket_accept() functions.
socket
A valid socket resource created with socket_create() or socket_accept().
length
The maximum number of bytes read is specified by the length parameter. Otherwise you can use \r, \n, or \0 to end reading (depending on the type parameter, see below).
type
Optional type parameter is a named constant:
PHP_BINARY_READ (Default) - use the system recv() function. Safe for reading binary data. PHP_NORMAL_READ - reading stops at \n or \r. socket_read() returns the data as a string on success, or false on error (including if the remote host has closed the connection). The error code can be retrieved with socket_last_error(). This code may be passed to socket_strerror() to get a textual representation of the error.
Note:
socket_read() returns a zero length string ("") when there is no more data to read.
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https://www.php.net/manual/en/function.socket-read.php