How can I save the pictures I read from mysql in php to a local pic?

How can I save the pictures I read from mysql in php to a local pic? Mysql stores jpg images in the mediablob format. display I can use: & nbsp; $ showidxnumber = $ _ GET ["idx_num"]; & nbsp; $ result = mys in php, how do I save the image I read from mysql as a local pic?
Mysql stores jpg images in the mediablob format.

Display I can use:
$ Showidxnumber = $ _ GET ["idx_num"];
$ Result = mysql_query ("SELECT * FROM ecard WHERE picidx = $ showidxnumber ");
$ Row = mysql_fetch_object ($ result );
Echo $ row-> picdata;

However, there is a new requirement to save the image locally, for example, to save it as c: \ a.jpg. how do I write the code? Thank you for choosing. php mysql.
------ Solution --------------------
File_put_contents ('C: \ a.jpg ', $ row-> picdata );