<?php

$path =
"/usr/www/html/index.php";

echo basename($path)."<br>";

//如果选择suffix则忽略扩展名

echo basename($path,".php");

?>

<?php

//——FILE__返回文件完整路径

$dir = dirname(__FILE__);

echo $dir;

?>

<?php

$path =
"/usr/www/html/index.php";

$pathinfo 
= pathinfo($path);

echo "目录名称：$pathinfo[dirname]<br>";

echo "文件名称：$pathinfo[basename]<br>";

echo "扩展名：$pathinfo[extension]";

?>

<?php

$path =
"./exercise/php.txt";

$realpath 
= realpath($path);

echo $realpath;

?>