How to realize Multi-conditional query Database by php

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Php multi-conditional query database implementation methods: 1, do a form, and create a table to display the table; 2, call the wrapper class, create corresponding conditions, and verify whether the data is empty; 3, use php code to traverse the query database table.

This article operating environment: Windows7 system, PHP7.1 version, Dell G3 computer

Php how many conditions to query the database?

Multi-conditional query:

1. First make a form and create a table to display the table:

Code name series time to market price

2. Call the wrapper class, create the corresponding conditions, and verify whether the data is empty: