I have this serialize data in my mySQL database

a:4:{i:0;s:7:"bvl.png";i:1;s:8:"ccop.jpg";i:2;s:11:"reyborn.png";i:3;s:13:"swopgroup.jpg";}

How can I update this da开发者_运维知识库ta, for example I want to delete ccop.jpg?

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Do not store serialized data in database.

Create a linked table consists of main_id and picture and store your image names in it.
So, you will have distinct access to them.

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You have to fetch the value from the database, unserialize it, remove the element, serialize it and save again.

$remove = "ccop.jpg";

//
// get the string from the database
//

$arr = unserialize($str);

foreach($arr as $key => $value)
  if ($value == $remove) unset($arr[$key]);

$str = serialize($arr);

//
// save the string back to the database
//

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Instead of saving serialized list of values, it's better to have a normalized database and just do a simple DELETE FROM images WHERE object_id = ....

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Ideally you need to

• extract it
• deserialize it
• modify it
• serialize it
• write it back to the database.

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Since you are storing it in a VARCHAR field and it is a PHP serialized array you would want to pull it out of the database unserialize and then re-update the field. You shouldn't look to MySQL to modify PHP specific information because well ... that's not what it is made for.