<?php
$file1 = '/somefile.jpg';
$file2 = 'file://shouldbelocal.jpg';
$file3 = 'http://someotherfile.jpg';
$file4 = 'file:///indeedlocal.jpg'; // 请注意 '///' 而不是 '//'
$local = stream_is_local($file1);
$shouldbelocal = stream_is_local($file2);
$remote = stream_is_local($file3);
$indeedlocal = stream_is_local($file4);
var_dump($local, $shouldbelocal, $remote, $indeedlocal);