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The form submits the fields via POST to a php page which updates a table in a database with the $_POST vars. Modifying updates contain $-operators and change fields in a document: they might increment counters, push new elements onto an array, or change the type of a field.

Updating only fields which users have changed submits the fields via POST to a php page which updates a table in a database with the $_POST vars. For example, a modifying update could add a new field to a document.

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When I ve done little play pages in the past I ve lumped all this stuff together in one page, so will all the includes (at least two each time a user goes to thing.

No this is a completely separate issue and you will have a complete fuck-up and data loss if it happens (and it will).

With all this extra code the potential for accidentally introducing bugs is enormous.

There s very little chance that two users will be updating the same table at the same time with this particular site, but anyone see any particular problems with any of the above three methods.

php file where i can give input as qty= some value and click submit it should update the 2nd row.

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