is_executable

Supported Versions: PHP 4, PHP 5, PHP 7, PHP 8
Tells whether the filename is executable
<?php is_executable(string $filename): bool
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<?php             foreach ($package->getBinaries() as $bin) {

                if (file_exists($path . '/' . $bin) && !is_executable($path . '/' . $bin)) {

                    Silencer::call('chmod', $path . '/' . $bin, 0777 & ~umask());

                }

            }
src/Composer/Downloader/FileDownloader.php