preg_replace和file_get_contents没有读取阿拉伯文件名

Question

First it was the preg_replace not reading Arabic characters for file name so when downloading it shows .pdf only so I added the arabic characters to the preg_replace to get the file name as is. Now the file name shows as "اÙÙÙاعداÙعربية.pdf"

I'm not sure if anything wrong with my code

public function download($id){
    $toReturn = study_material::where('id',$id)->first();
    if(file_exists('uploads/material/'.$toReturn->material_file)){
        $fileName = preg_replace('/[^أ-يa-zA-Z0-9-_\.]/','',$toReturn->material_title). "." .pathinfo($toReturn->material_file, PATHINFO_EXTENSION);
        header("Content-Type: application/force-download");
        header('Content-Type: text/html; charset=utf-8');
        header("Content-Disposition: attachment; filename=" . $fileName);
        echo file_get_contents('uploads/material/'.$toReturn->material_file);
    }
    exit;
}

Answer 1

preg_replace does not support multibyte strings, so multi-byte letters are understood by the function as separate letters. You will need to use a multi-byte compatible function like mb_ereg_replace.