常见PHP字符串及文件操作题目

function reverse($str){
    $r = array();
    for($i=0; $i<mb_strlen($str); $i++){
        $r[] = mb_substr($str, $i, 1, 'UTF-8');
    }
    return implode(array_reverse($r));
}
echo reverse('www.phpabc.cn PHP学习博客');
//结果：'PHP学习博客 www.phpabc.cn'

function reverse($str){ $r = array(); for($i=0; $i<mb_strlen($str); $i++){ $r[] = mb_substr($str, $i, 1, 'UTF-8'); } return implode(array_reverse($r)); } echo reverse('www.phpabc.cn PHP学习博客'); //结果：'PHP学习博客 www.phpabc.cn'

function getext($url){
    $data = parse_url($url);
    $path = $data['path'];
    $info = pathinfo($path);
    return $info['extension'];
}
echo getext(' http://www.phpabc.cn/3052.html');
//结果：'html'

function getext($url){ $data = parse_url($url); $path = $data['path']; $info = pathinfo($path); return $info['extension']; } echo getext(' http://www.phpabc.cn/3052.html'); //结果：'html'

function getrpath($path, $conpath){
    $pathArr = explode('/', $path);
    $conpathArr = explode('/', $conpath);
    $dismatchlen = 0;
    for($i=0; $i<count($pathArr); $i++){
        if($conpathArr[$i] != $pathArr[$i]){
            $dismatchlen = count($pathArr) - $i;
            $arrleft = array_slice($pathArr, $i);
            break;
        }
    }
    return str_repeat('../', $dismatchlen).implode('/', $arrleft);
}
$a = '/a/b/c/d/e.php';
$b = '/a/b/12/34/5.php';
echo getrpath($a, $b);
//结果：'../../../c/d/e.php'

function getrpath($path, $conpath){ $pathArr = explode('/', $path); $conpathArr = explode('/', $conpath); $dismatchlen = 0; for($i=0; $i<count($pathArr); $i++){ if($conpathArr[$i] != $pathArr[$i]){ $dismatchlen = count($pathArr) - $i; $arrleft = array_slice($pathArr, $i); break; } } return str_repeat('../', $dismatchlen).implode('/', $arrleft); } $a = '/a/b/c/d/e.php'; $b = '/a/b/12/34/5.php'; echo getrpath($a, $b); //结果：'../../../c/d/e.php'

function finddir($dir){
    $files = array();
    if(is_dir($dir)){
        if($handle = opendir($dir)){
            while(($file = readdir($handle)) !== false){
                if($file != '.' && $file != '..'){
                    if(is_dir(rtrim($dir, '/').'/'.$file)){
                        $files[$file] = finddir(rtrim($dir, '/').'/'.$file);
                    }else{
                        $files[] = rtrim($dir, '/').'/'.$file;
                    }
                }
            }
            closedir($handle);
        }
    }
    return $files;
}
print_r(finddir('F:/Golang/src'));
//结果：
Array
(
    [0] => F:/Golang/src/hello.go
    [1] => F:/Golang/src/src.exe
    [test] => Array
        (
            [0] => F:/Golang/src/test/sss.txt
        )
 
)

function finddir($dir){ $files = array(); if(is_dir($dir)){ if($handle = opendir($dir)){ while(($file = readdir($handle)) !== false){ if($file != '.' && $file != '..'){ if(is_dir(rtrim($dir, '/').'/'.$file)){ $files[$file] = finddir(rtrim($dir, '/').'/'.$file); }else{ $files[] = rtrim($dir, '/').'/'.$file; } } } closedir($handle); } } return $files; } print_r(finddir('F:/Golang/src')); //结果： Array ( [0] => F:/Golang/src/hello.go [1] => F:/Golang/src/src.exe [test] => Array ( [0] => F:/Golang/src/test/sss.txt ) )