Detailed explanation of the usage of PHP functions call_user_func and call_user_func_array_PHP tutorial

The call_user_func function is used when a function needs to be dynamically called. This function has two uses:
The first is to call a lonely function:

Copy code The code is as follows:

function funa($b,$c)
{
echo $b;
echo $c;
}
call_user_func('funa', "111","222");
call_user_func('funa', "333","444");
//Display 111 222 333 444
//Have you noticed that this usage is a bit like the call method in javascript, hehe
?>

The second is to call the function inside the class:

Copy code The code is as follows:

class a {
function b()
{
$args = func_get_args( );
        $num = func_num_args(); ),"111","222");
?>

Run the above example yourself and see what the result is~ Hehe~ Please note that the func_get_args() function obtains the incoming The parameters in the function return an array, and the func_num_args() function obtains the number of parameters passed into the function.

Let’s take a look at the call_user_func_array function
This function is also used when a function needs to be called dynamically. Its usage is similar to the call_user_func function, except that the parameters are passed in as an array.

Copy code

The code is as follows:

function a($b, $c){ echo $b;

echo $c;

}
call_user_func_array('a', array("111", "222"));
//Display 111 222
? >


The call_user_func_array function can also call methods inside the class

Copy the code

The code is as follows:

Class ClassA{ function bc($b, $c) {

$bc = $b + $c;
echo $bc;
}

}

call_user_func_array(array('ClassA','bc'), array(“111″, “222″));
//Display 333
?>

Let’s look at another example of dynamically calling a function:

Copy the code

The code is as follows:

function otest1 ( $a){ echo( 'One parameter' );

}

function otest2 ( $a, $b)
{
echo( 'Two parameters ' );
}

function otest3 ( $a ,$b,$c)
{
echo( 'Three' );
}

function otest (){
$args = func_get_args();
$num = func_num_args();
call_user_func_array( 'otest'.$num, $args );
}
otest ("11");
otest("11","22");
otest("11","22","33");
?>

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truehttp: //www.bkjia.com/PHPjc/736829.htmlTechArticleThe call_user_func function is used when a function needs to be dynamically called. This function has two uses: The first It is a lonely function to be called: Copy the code as follows: ?php function fu...