[lang-ref] ( get_extension ) ( php )

<?php
public function testGetExtension(): void
{
	// pathinfo($path, PATHINFO_EXTENSION)
	$this->assertSame('txt'    , pathinfo('/path/to/file.txt'    , PATHINFO_EXTENSION));
	$this->assertSame('gz'     , pathinfo('/path/to/file.tar.gz' , PATHINFO_EXTENSION));
	$this->assertSame('bashrc' , pathinfo('/path/to/.bashrc'     , PATHINFO_EXTENSION)); // . prefix is assumed as extension
}