我想在字符串的末尾连接单引号

I want to concat a single quote at the end of the string How can i do this thing in php?

    $file = $this->form->getValue('doc');
    $filename = $file->getOriginalName();
    $file_name=$fn.'_'.md5($fiename);
    $extension = $file->getExtension($file->getOriginalExtension());

try this:

$file_name=$fn.'_'.md5($fiename).",";

in php . is used for concat.

Try like this

$file = $this->form->getValue('doc');
$filename = $file->getOriginalName();
$file_name=$fn.'_'.md5($filename); //There is no $fiename, so i changed it to $filename
$file_name=$file_name."'";//Concatenating here.
$extension = $file->getExtension($file->getOriginalExtension());

Try this

$file = $this->form->getValue('doc');
$filename = $file->getOriginalName();
$file_name=$fn.'_'.md5($fiename)."'";
$extension = $file->getExtension($file->getOriginalExtension());