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Sends a message to a socket, whether it is connected or not (PHP 4 >= 4.0.7, PHP 5)
int socket_sendto ( resource socket, string buf, int len, int flags, string addr [, int port] )

The function socket_sendto() sends len bytes from buf through the socket socket to the port at the address addr.



A valid socket ressource created using socket_create().


The sent data will be taken from buffer buf.


len bytes from buf will be sent.


The value of flags can be any combination of the following flags, joined with the binary OR (|) operator.

Table 299. Possible values for flags

MSG_OOB Send OOB (out-of-band) data.
MSG_EOR Indicate a record mark. The sent data completes the record.
MSG_EOF Close the sender side of the socket and include an appropriate notification of this at the end of the sent data. The sent data completes the transaction.
MSG_DONTROUTE Bypass routing, use direct interface.


IP address of the remote host.


port is the remote port number at which the data will be sent.

Return Values

socket_sendto() returns the number of bytes sent to the remote host or -1 if an error occured.


Example 2300. socket_sendto() Example

= socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);

$msg = "Ping !";
$len = strlen($msg);

socket_sendto($sock, $msg, $len, 0, '', 1223);