This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
PDO::sqliteCreateFunction() allows you to register a PHP
function with SQLite as an UDF (User Defined
Function), so that it can be called from within your SQL statements.
The UDF can be used in any SQL statement that can call functions, such as
SELECT and UPDATE statements and also in triggers.
Parameters
function_name
The name of the function used in SQL statements.
callback
Callback function to handle the defined SQL function.
Note:
Callback functions should return a type understood by SQLite (i.e.
scalar type).
num_args
Hint to the SQLite parser if the callback function accepts a
predetermined number of arguments.
Note: Two alternative syntaxes are
supported for compatibility with other database extensions (such as MySQL).
The preferred form is the first, where the dbhandle
parameter is the first parameter to the function.
Examples
Example 1. PDO::sqliteCreateFunction() example
<?php function md5_and_reverse($string) { return strrev(md5($string)); }
$db = new PDO('sqlite:sqlitedb'); $db->sqliteCreateFunction('md5rev', 'md5_and_reverse', 1); $rows = $db->query('SELECT md5rev(filename) FROM files')->fetchAll(); ?>
In this example, we have a function that calculates the md5 sum of a
string, and then reverses it. When the SQL statement executes, it
returns the value of the filename transformed by our function. The data
returned in $rows contains the processed result.
The beauty of this technique is that you do not need to process the
result using a foreach() loop after you have queried for the data.
Tip:
You can use PDO::sqliteCreateFunction() and
PDO::sqliteCreateAggregate() to override SQLite native
SQL functions.
Note:
This method is not available with the SQLite2 driver.
Use the old style sqlite API for that instead.
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