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PHP - usort example

on September 21, 2020

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Yii2 - migration foreign key

A FOREIGN KEY is a key used to link two tables together. Syntax Add foreign key Drop foreign key

filterWhere() - ignores search by empty values. When the search is executed by two fields, for example book and author, if the book value is empty then filterWhere() ignores the search by book and the search will be executed only by author andFilterWhere() - Appends WHERE condition to the existing one.

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PHP - usort example

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