php 实现传入参数的传出

<?php
$x=2;
inOutFunction($x);
function inOutFunction(&$x){
    $x=3;
    return ‘a‘;
}
echo $x;
exit();

<?php
$dir=‘/‘;
print_r(scanfDir($dir,true,$ret));

function scanfDir($dir = ‘‘, $all = false, &$ret = array()) {
    $x=‘avc‘;
    if (false !== ($handle = opendir($dir))) {
        while (false !== ($file = readdir($handle))) {
            if (!in_array($file, array(‘.‘, ‘..‘, ‘.git‘, ‘.gitignore‘, ‘.svn‘, ‘.htaccess‘, ‘.buildpath‘, ‘.project‘))) {
                $cur_path = $dir . ‘/‘ . $file;
                if (is_dir($cur_path)) {
                    $ret[‘dirs‘][] = $cur_path;
                    $all && scanfDir($cur_path, $all, $ret);
                } else {
                    $ret [‘files‘] [] = $cur_path;
                }
            }
        }
        closedir($handle);
    }
    return $ret;
}