Posttextarea graphic information to the back, but the background can not be extracted to the image array, solve?

The posttextarea graphic information is sent to the background, but the background cannot be extracted to the image array ???? I used kindeditor to create a textarea online editing box. when a user deletes an image in textarea and uploads another image, the server space is saved .. I extracted textarea images from the original database to form an array, and then sent each post textarea image information in the array to the background, but the background could not be extracted to the image array ????
I used kindeditor to create a textarea online editing box. when a user deletes an image in textarea and uploads another image, the server space is saved .. I extracted the textarea image from the original database to form an array, and then compared each value in the array with the new textarea in_array (). The unsaved image will be deleted .. It is strange that the newly passed textarea cannot be extracted to the image array, and the extraction result is an empty array .. Thank you for your consideration .. Post extract image http share:
------ Solution --------------------
You need to know how you extract
You also need to know the content of $ _ POST ['textarea '].