使用php将内容添加到字符串上的位置的最有效方法是什么？

Question

I have a string localhost/uploads/images/photo.jpg, I just want to simply rename it to localhost/upload/images/photo_thumb.jpg, keeping in mind that is a dynamic data and am just using it to simply what I want to achieve. I have tried to use the strpos() function to get the position of the '.' then use it for something(this where I got lost), then another thought came to me use implode. I will appreciate if some can help me figure this out thanks.

<?php
function get_google_image_url($type, $id, $column = 'image', $multi = "",$thumb=''){
  if($multi ==''){
    //check if there is thumbnail add _thumb before extention
    if($thumb != ''){
      $l= $this->db->get_where($type,array($type.'_id'=>$id));
      $n = $l->num_rows();
      if($n >0){
        $value = $l->row()->$column;
        $position = strripos($value,'.');
        return $l->row()->$column;
      }
    }else{
      $l= $this->db->get_where($type,array($type.'_id'=>$id));
      $n = $l->num_rows();
      if($n >0){
        /$value = $l->row()->$column
          $position = strripos($value,'.');
        //this where i got stucked
        //return $l->row()->$column;
      }
    }
  }
}

that's the function am trying to implement it in, but what I want to achieve is what I stated above.

Answer 1

i think the best way here is to use pathinfo

something like that should work

$path_parts = pathinfo('localhost/uploads/images/photo.jpg');
$strNewName = $path_parts['dirname'].'/photo_thumb.jpg';
echo $strNewName;