(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_read — Reads a maximum of length bytes from a socket
The function socket_read() reads from the Socket instance socket created by the socket_create() or socket_accept() functions.
socketA Socket instance 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 mode parameter, see below).
mode Optional mode 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.