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PHP Socket context options
Introduction
Access to filesystem and various other stream wrappers can be customized by various context options and parameters configures by stream_context_create() and stream_context_set_option() functions.
Following list shows various socket context options are available for all wrappers that work over sockets, like tcp, http and ftp.
| bindto | specifies the IP address (either IPv4 or IPv6) and/or the port number used to access the network. (ip:port for IPv4 [ip]:port for IPv6). |
| backlog | limits number of outstanding connections in socket's listen queue. |
| ipv6_v6only | Overrides the OS default regarding mapping IPv4 into IPv6. |
| so_reuseport | Allows multiple bindings to a same ip:port pair. |
| so_broadcast | Enables sending and receiving data to/from broadcast addresses. |
| tcp_nodelay | If TRUE, sets SOL_TCP,NO_DELAY=1 appropriately, disabling TCP Nagle algorithm. |
Example
<?php
// connect to the internet using the '192.168.0.100' IP
$opts = array(
'socket' => array(
'bindto' => '192.168.0.100:0',
),
);
// ...and use it to fetch the data
echo file_get_contents('http://www.example.com', false, $context);
?>
Updated on: 21-Sep-2020
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