Makes bit.ly links with your designated UTM attribution codes!

makebitlylinks.php

<?php

/***********************************************

Bitly Google Analytics Preparation Script
Copyright © 2016-2017 Christopher S. Penn

The purpose of this code is to transform a list of plain text URLs and turn them into bit.ly links.

Requirements:

A machine with PHP 5+ on it
cUrl for PHP/CLI
A bit.ly API key 
Read/write access to the local disk

Instructions:

Run this file locally; the arguments should be the input file, followed by source, medium, and campaign, with no spaces or punctuation other than dashes

Example:

php makebitlylinks.php mylinklist.txt facebook social-media cspenn

License:

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

************************************************/

// configuration stuff - change the timezone if you want it to be accurate for your machine

date_default_timezone_set('America/New_York');
ini_set('auto_detect_line_endings', TRUE);

// Your bit.ly API key goes here!

$apikey = "YOURBITLYAPIKEYGOESHERE";

// UTM tracking codes are passed in as parameters

$utmsource   = $argv[2]; // source, like Facebook
$utmmedium   = $argv[3]; // medium, like social or PPC
$utmcampaign = $argv[4]; // campaign, like may-2017-posts

// some defaults you can fill in if you forget to specify them

if ($utmsource == "") {
    $utmsource = "Facebook";
}

if ($utmmedium == "") {
    $utmmedium = "socialmedia";
}

if ($utmcampaign == "") {
    $utmcampaign = "cspenn";
}

/**************************************
Nothing else to change for the user below this point
***************************************/

// logfile outputs as a txt file

$stamp      = date("Y-m-d-h-i-s");
$shortstamp = date("Y-m-d");
$logfile    = "bitlylinks-$stamp.txt";
$fp         = fopen($logfile, "w");

// input file to open

$handle = @fopen($argv[1], "r");

// parse the file, line by line

if ($handle) {
    while (($buffer = fgets($handle, 4096)) !== false) {
        $longurl = trim($buffer);
        
        // break off existing parameters - warning, this will break standard YouTube links!
        
        $cleanurl = strtok($longurl, '?');
        
        // add UTM codes
        
        $encodeurl = $cleanurl . "?utm_source=" . $utmsource . "&utm_medium=" . $utmmedium . "&utm_campaign=" . $utmcampaign;
        
        $finalurl = urlencode($encodeurl);
        
        // re-encode
        $bitly = "https://api-ssl.bitly.com/v3/shorten?&access_token=$apikey&longUrl=$finalurl";
        
        $results = json_decode(file_get_contents($bitly), true);
        
        var_dump($results);
        $theurl = $results['data']['url'];
        
        fwrite($fp, "$theurl\n");
        
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }
    fclose($handle);
}

?>