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A brief analysis of the call user func() function in PHP and how to use call user func to call a custom function, callfunc_PHP tutorial
A brief analysis of the call user func() function in PHP and how to use call user func to call a custom function, callfunc_PHP tutorial
A brief analysis of the call user func() function in PHP and how to use call user func to call a custom function, callfunc
There is a function call_user_func in the UCenter source code, and I thought it was myself at first The result of the defined function cannot be found anywhere. Later I learned that call_user_func is a built-in function of PHP. This function allows users to call directly written functions and pass in certain parameters. Here is a summary of how to use this function.
The call_user_func function is similar to a special method of calling a function. The method of use is as follows:
<?php
function nowamagic($a,$b)
{
echo $a;
echo $b;
}
call_user_func('nowamagic', "","");
call_user_func('nowamagic', "","");
//显示
?>
It’s strange to call the method inside the class. It actually uses array. I don’t know what the developer thought about it. Of course, new is omitted, which is quite innovative:
<?php
class a {
function b($c)
{
echo $c;
}
}
call_user_func(array("a", "b"),"");
//显示
?> The call_user_func_array function is very similar to call_user_func, except that the parameters are passed in a different way to make the structure of the parameters clearer:
<?php
function a($b, $c)
{
echo $b;
echo $c;
}
call_user_func_array('a', array("", ""));
//显示
?> The call_user_func_array function can also call methods inside the class:
<?php
Class ClassA
{
function bc($b, $c) {
$bc = $b + $c;
echo $bc;
}
}
call_user_func_array(array('ClassA','bc'), array("", ""));
//显示
?> Both the call_user_func function and the call_user_func_array function support references, which makes them more functionally consistent with ordinary function calls:
<?php
function a($b)
{
$b++;
}
$c = ;
call_user_func('a', $c);
echo $c;//显示
call_user_func_array('a', array($c));
echo $c;//显示
?>
另外，call_user_func函数和call_user_func_array函数都支持引用。
view sourceprint?
<?php
function increment(&$var)
{
$var++;
}
$a = ;
call_user_func('increment', $a);
echo $a; //
call_user_func_array('increment', array(&$a)); // You can use this instead
echo $a; //
?>The following will introduce how to use call_user_func to call a custom function
Use the call_user_func function to call a custom function by passing in a string function and support references.
1.mixed call_user_func ( callable $callback [, mixed $parameter [, mixed $... ]] )
Call the custom function provided by the first parameter, the following parameters are the parameters of the custom function, and return the result of the custom function
function say($word)
{
echo $word;
}
call_user_func('say', 'hello world'); //hello world
当然也可以调用类中的方法：
class A {
function say($word = '')
{
echo $word;
}
}
$a = new A(); //注意，必须是要实例化的，除非是static
call_user_func(array($a, 'say'), 'hello world'); //hello world2.mixed call_user_func_array ( callable $callback , array $param_arr )
It is said that call_user_func_array and call_user_func functions have the same function, but there are some differences when calling parameters:
function a($word)
{
echo $word;
}
class A {
function say($word = '')
{
echo $word;
}
}
call_user_func_array('a', array('hello world')); //hello world
$a = new A(); //注意，必须是要实例化的，除非是static
call_user_func_array(array($a, 'say'), array('hello world')); //hello worldNote: The other two similar functions are call_user_method and call_user_method_array(), but they were discontinued and abandoned after PHP 4.1
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