百科狗SQLite3::createFunction() - sqlite3数据库类
SQLite3::createFunction()
(PHP 5 >= 5.3.0, PHP 7)
Registers a PHP function for use as an SQL scalar function
说明
publicSQLite3::createFunction(string $name, mixed $callback[,int $argument_count= -1[,int $flags= 0]]): boolRegisters a PHP function or user-defined function for use as an SQL scalar function for use within SQL statements.
参数
$nameName of the SQL function to be created or redefined.
$callbackThe name of a PHP function or user-defined function to apply as a callback, defining the behavior of the SQL function.
This function need to be defined as:callback(mixed $value1[,mixed$...]): mixed$value1
The first argument passed to the SQL function.
...Further arguments passed to the SQL function.
$argument_countThe number of arguments that the SQL function takes. If this parameter is-1, then the SQL function may take any number of arguments.
$flagsA bitwise conjunction of flags. Currently, onlySQLITE3_DETERMINISTICis supported, which specifies that the function always returns the same result given the same inputs within a single SQL statement.
返回值
ReturnsTRUEupon successful creation of the function,FALSEon failure.
更新日志
| 版本 | 说明 |
|---|---|
| 7.1.4 | The$flagsparameter has been added. |
范例
SQLite3::createFunction()example
But until this cool feature becomes available, you'll have to do some tricks, like this for french:
