Turning A List Of MySQL Rows Into A Serialized PHP string

Shawn DeWolfe — Tue, 26 Nov 2019 17:48:08 +0000

SELECT DISTINCT p.ID as post_id, 'prefix_list', CONCAT('a:', COUNT(*), ':{', GROUP_CONCAT(CONCAT('i:', f.`delta`, ';s:',LENGTH(f.`field_prefix_list_value`),':"', UPPER(f.`field_prefix_list_value`), '"') SEPARATOR ';'), ';}') AS `prefixes` FROM `Giwth4_posts` p INNER JOIN node_field_data n ON (p.post_title = n.title COLLATE utf8mb4_unicode_ci) INNER JOIN `node__field_prefix_list` f ON f.revision_id = n.vid WHERE n.status = 1 AND f.deleted = 0 GROUP BY f.`entity_id` ORDER BY f.`delta`

It starts with a count of how many elements are in a group
It takes the records, grouped by the common element (in this case, entity_id)
It concatenates the delta that is avaialble as the array index
It looks at the length of the value needed
In my case, I needed upper case strings, so I put in an UPPER() function call
It separates each one with a semi-colon
It group concatenates that
It does the rest of the necessary formatting.
It orders the elements by their delta inside of the groups to go from lowest to highest index

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Turning A List Of MySQL Rows Into A Serialized PHP string