SQLite3::createCollation()

(PHP 5 >= 5.3.11, PHP 7)

Registers a PHP function for use as an SQL collating function

说明

Registers a PHP function or user-defined function for use as a collating function within SQL statements.

参数

Name of the SQL collating function to be created or redefined

The name of a PHP function or user-defined function to apply as a callback, defining the behavior of the collation. It should accept two values and return as strcmp() does, i.e. it should return -1, 1, or 0 if the first string sorts before, sorts after, or is equal to the second.

This function need to be defined as:collation(mixed $value1, mixed $value2): int

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

SQLite3::createCollation() example

Register the PHP function strnatcmp() as a collating sequence in the SQLite3 database.

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