Rename class constructor methods to `__construct`

fix-constructors.php

<?php

// dry run
// find . -type f -name '*.php' -exec php fix-constructors.php {} \;

// real run
// find . -type f -name '*.php' -exec php fix-constructors.php {} y \;

// @read https://ideone.com/aLpfBh
// @read https://regex101.com/r/hzzzkz/1/

$filepath = $argv[1];
$dryRun = empty($argv[2]);

$source = file_get_contents($filepath);

$class_regex = '~
        ^\s*class\s+
        (?P<class>\S+)[^{}]+(\{
        (?:[^{}]*|(?2))*
        \})~mx';

$result = preg_replace_callback(
    $class_regex,
    function ($match) {
        $function_regex = '~function\s+\K'.$match['class'].'~';

        return preg_replace($function_regex, '__construct', $match[0]);
    },
    $source
);

if ($result && $result !== $source) {
    echo "File '{$filepath}' needs a fix.\n";

    if (!$dryRun) {
        if (!file_put_contents($filepath, $result)) {
            fwrite(STDERR, "Failed to rewrite the file '{$filepath}'.\n");
        }
    }
}