Convert single, comma separated mutli-namspace use statements into multiple use calls with single namespace references

fix-cs-multiuse.php

<?php

/**
 * Convert single use calls with comma separated list of namespaces into
 * multiple, stand-alone use calls
 *
 * Usage: php cs-fix-use.php <file>
 *
 * Will overwrite <file> with new version. If <file> is omitted, stdin / stdout
 * will be used.
 *
 * To run on an entire directory, it is recommended to use a tool such as find,
 * for example:
 *
 *   find ./src -type f -name "*.php" -exec php cs-fix-use.php {}\;
 *
 * NOTE: you should back up your code or make sure it is committed to SCM before
 *       using this script. This may break your code.
 *
 */

if (PHP_SAPI != 'cli') {
    echo "Sorry, this script should be run in CLI\n";
    exit(1);
}

if (isset($_SERVER['argv'][1])) {
    $file = $_SERVER['argv'][1];
} else {
    $file = 'php://stdin';
}

$input = file_get_contents($file);
if (! $input) {
    fprintf(STDERR, "ERROR: unable to read input file $file\n");
    exit(1);
}

// Step 1: find all use statements
if (preg_match_all('/^use\s+([^;]+,[^;]+)/ms', $input, $matches, PREG_SET_ORDER)) {

    foreach($matches as $match) {
        // Step 2: break down statement into specific use calls
        $statements = explode(',', $match[1]);
        foreach($statements as $key => $value) {
            $value = trim($value);
            $statements[$key] = "use $value";
        }

        // Step 3: Replace use block
        $replacement = implode(";\n", $statements);
        $input = str_replace($match[0], $replacement, $input);
    }
}

// Write output back
if ($file == 'php://stdin') {
    // print to stdout
    echo $input;
} else {
    // Write back to the original file
    file_put_contents($file, $input);
}