A scriplet to update SVN from web + log the output and client IP (just rename this to some random script)

svn_invoke.php

<?php
# ======================================================================
# Update SVN from web invoke script
# ----------------------------------------------------------------------
# Basic functions
# ======================================================================
function _appendLog($data) {
	file_put_contents("svn.log", $data."\n", FILE_APPEND | LOCK_EX);
}

# ======================================================================
# Let's BEGIN
# ======================================================================

// Ensure that SVN credentials are already saved else modify the command below to add those credentials explicitly
exec("svn co http://usvn.vteamslabs.com/svn/asimzeeshan/trunk /home/asim/svn-test", $output);

// if there is output
if (!empty($output)) {

	// ensure that you get the IP regardless of local-network, proxy or public ip
	if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
	    $client_ip = $_SERVER['HTTP_CLIENT_IP'];
	} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
	    $client_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
	} elseif (!empty($_SERVER['REMOTE_ADDR']))  {
	    $client_ip = $_SERVER['REMOTE_ADDR'];
	} else {  // if executed through php5-cli, none of the above variables will have any data. We need a filler hence the "filler" below
		$client_ip = "php5-cli";
	}

	// prepend the transaction
	_appendLog("\nSVN UPDATE INITIATED FROM $client_ip on ".date('Y-m-d H:i:s'));

	// add the multiline output
	// I hope PHP7 adds support for array() as $data
	foreach ($output as $row) {
		echo $row."<br />";
		_appendLog($row); // log it
	}
}

Sample output in the logs would be

SVN UPDATE INITIATED FROM php5-cli on 2015-08-27 19:52:57
Checked out revision 450.

Linear approach, added a function _appendLog() to centralize the logging

Added <br /> instead of \n because in the browser, it will be a mess