Lightroom renaming export action

lightroom-rename.php

#!/usr/bin/env php
<?php

/**
 * Lightroom rename export action
 *
 * !! Please read carefully.
 *
 * This script is meant to be used with Lightroom as an export action. I wrote this script because I always rename my
 * files on import using a specific format. When exporting however I want to replace a portion of the filename with the
 * title included in the IPTC metadata. Unfortunately Lightroom's renaming capabilities are quite poor so this script
 * does the work instead.
 *
 * My files have the following format after importing:
 *
 * 20181120-200057-0099 Test.cr2
 *     |      |      |   |
 *     |      |      |   \
 *     |      |      \     Shoot name
 *     |      \        Original image number
 *     \        Time (hour minute second)
 *       Date (year month day)
 *
 * In many cases (shooting concerts for example) it's easier to have 'Test' replaced with the actual title of the photo.
 * Also I like to have the longest edge size appended so I can quickly see for what purpose it was exported, so it
 * becomes:
 *
 * 20181120-200057-0099 Awesome Band_1200.jpg
 *
 * Normally you can do this within Lightroom just fine, except that the original image number is not available in the
 * metadata and lightroom cannot replace parts when renaming as Photoshop can.
 *
 * Feel free to edit this script!
 */

if ($argc === 1) {
    exit(0);
}

function logMessage(string $text, ?array $data = null)
{
    if ($data !== null) {
        $text = $text.' - '.json_encode($data);
    }

    $text = sprintf('[%s] %s', date('c'), $text);

    // Comment the line below to disable logging errors.
    file_put_contents(__DIR__.'/lightroom-rename.log', $text.PHP_EOL, FILE_APPEND);
}

for ($i = 1; $i < $argc; $i++) {
    $dir = dirname($argv[$i]);
    $file = basename($argv[$i]);

    // Read size and extended info (APP markers)
    $info = null;
    $size = getimagesize($argv[$i], $info);

    if (isset($info['APP13']) === false) {
        // No metadata was found so skip.
        logMessage('No APP13 metadata block found in file.', ['file' => $argv[$i]]);
        continue;
    }

    // Read IPTC metadata
    $iptc = iptcparse($info['APP13']);

    // File title
    $title = $iptc['2#005'][0] ?? null;

    if (empty($title)) {
        // Title is empty, skip renaming
        logMessage('Title is empty, skipping.', ['file' => $argv[$i], 'iptc' => $iptc]);
        continue;
    }

    // New filename (edit to match your filename structure)
    $newFile = preg_replace('/([0-9]+\-[0-9]+\-[0-9]+\s).+?(\_[0-9]+)?(\.jpg)/i', sprintf('${1}%s_%d${3}', $title, max($size[0], $size[1])), $file);

    // Rename
    rename($argv[$i], $dir.DIRECTORY_SEPARATOR.$newFile);
}