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call_user_func

call_user_func
It Call a user function that given by the first parameter
This is one of the method for calling a user-defined function.

Syntax:

mixed call_user_func ( string function_name [, mixed parameter [, mixed …]])

It Call a user defined function given by the function_name in the first parameter.

Example:

function test(int x)
{
}
function test(int x,int y)
{
}

The above function can be called as
test(2);
test(3,4);

By using the call_user_func We call the above function as

call_user_func (’test’, 2);
call_user_func (’test’, 3,4);

here, both are calling the function test().

get_defined_functions

get_defined_functions
- It  returns an array of all defined functions

Syntax:

array get_defined_functions ( void)

This function returns an multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal functions will be accessible via $arr[”internal”], and the user defined ones using $arr[”user”]

Example:

function sample()
{
return true;
}

$arr = get_defined_functions();

print_r($arr);

The result in $arr is

Array
(
[internal] => Array
(
[0] => zend_version
[1] => func_num_args
[2] => func_get_arg
[3] => func_get_args
[4] => strlen
[5] => strcmp
[6] => strncmp
…
[750] => bcscale
[751] => bccomp
)

[user] => Array
(
[0] => sample
)

)

This function is used toshift an element off the beginning of array

Syntax:

mixed array_shift( array array)

Example:

$input = array (”user1″, “user2″, “user3″);

$output =array_shift($input);

The result when we print $input will be like

Array

(

[0] => user2

[1] => user3

)