So I'd like to use the call_user_func
to pass data to an optional parameter of a function.
Here's the example of a code, the optional parameter $data
represents a functional called data
that was declared in another file. I just want it to be called by using call_user_func
that will set the parameter with the function's name and call it within the createtable function, but doesn't seem to work.
I got the example from the PHP Manual, but createTable
contains many parameters. How can I make call_user_func
only assign the string data
to the optional parameter $data
set to NULL
as default?
function createTable($database, $table, $patch,$data = NULL)
{
echo "INFO: Adding '$table'in database '$database'.\n";
$sql = "SHOW TABLES FROM $database WHERE Tables_in_$database='$table';";
$result = mysql_query($sql);
$result_count = mysql_num_rows($result);
if ( $result_count != 1 ) {
echo "ERROR: Can not find table '$table' in database '$database'.\n";
$result = mysql_query($patch);
if ( false === $result ) {
echo "ERROR: Adding Table '$table' in database '$database' ... Failed\n";
return false;
}
else {
echo "INFO: Adding Table '$table'in database '$database' ... Success\n";
// using the optional parameter here
$data();
return true;
}
} else {
if ( $result_count == 1 ) {
echo "ERROR: Table '$table'already in database '$database'.\n";
return false;
}
}
}
// Now I'm passing value to the optional parameter $ data that is NULL as default.
call_user_func('createTable', "data");
you must pass value like this
call_user_func('createTable', $database, $table, $patch,$data);
or this for call from class
call_user_func(array(&$objectName->{$anotherObject},$functionName), $arg1, $arg2, $arg2);
or you can use this can get arg as array
call_user_func_array("createTable", array("one", "two"));
or this for call from class can get arg as array
call_user_func_array(array($foo, "bar"), array("three", "four"));
or This can help you too it not need to pass all args
function __named($method, array $args = array())
{
$reflection = new ReflectionFunction( $method);
$pass = array();
foreach($reflection->getParameters() as $param)
{
/* @var $param ReflectionParameter */
if(isset($args[$param->getName()]))
{
$pass[] = $args[$param->getName()];
}
else
{
try{
$pass[] = $param->getDefaultValue();
}catch(Exception $e){
$pass[] = NULL;
}
}
}
return $reflection->invokeArgs( $pass);
}
I hope It Work
sample:
__named('createTable', array('data' => 'value'));
and it is for use in class
public function __named($method, array $args = array())
{
$reflection = new ReflectionMethod($this, $method);
$pass = array();
foreach($reflection->getParameters() as $param)
{
/* @var $param ReflectionParameter */
if(isset($args[$param->getName()]))
{
$pass[] = $args[$param->getName()];
}
else
{
try{
$pass[] = $param->getDefaultValue();
}catch(Exception $e){
$pass[] = NULL;
}
}
}
return $reflection->invokeArgs($this,$pass);
}
if you Don't set any value __named Put Null instead of Unset Value