在目录中查找文件

$dir =\"your path here\";

$filetoread =\"pic_1_\";
    if (is_dir($dir)) {
        if ($dh = opendir($dir)) {
            while (($file = readdir($dh)) !== false) {
               if (strpos($file,$filetoread) !== false)
                echo \"filename: $file : filetype: \" . filetype($dir . $file) . \"\\n\";
            }
            closedir($dh);
        }
    }

foreach (glob(\"directory/pic_1_*\") as $filename) {
  echo \"$filename\";
}

directory

foreach (glob(\"pic_1*.jpg\") as $file)
{
    echo $file;
}

scandir

preg_grep

<?php
if ($handle = opendir(\'.\')) {
    while (false !== ($file = readdir($handle))) {
        if ($file != \".\" && $file != \"..\") {
            echo \"$file\\n\";
        }
    }
    closedir($handle);
}
?>

if (substr($file, 0, 6) == \'pic_1_\')