Let's talk about the relevant knowledge of PHP execution function method name

PHP is a popular programming language commonly used for server-side programming. In PHP, function is a keyword that defines functions, through which you can define some useful methods to complete common programming tasks. This article will introduce the relevant knowledge of PHP execution function method name.

In PHP, an available function can be called using the function name and a set of parentheses. For example:

function hello() {
    echo "Hello World!";
}

hello();

Running the above code can output "Hello World!".

However, in some cases, we may need to use function names to execute methods. At this time, you can use the call_user_func and call_user_func_array functions to achieve this.

call_user_funcThe function takes the specified function method as the first parameter and the parameter to be passed as the second parameter to execute the method. For example:

function add($a, $b) {
    return $a + $b;
}

echo call_user_func('add', 2, 3); // 输出 5

As shown in the above example, you can pass the function name as a string to the call_user_func function, followed by the parameters to be passed to the function.

call_user_func_arrayThe function takes the specified function method as the first parameter and the parameter to be passed as the second parameter (array) to execute the method. For example:

function foo($a, $b, $c) {
    return $a + $b + $c;
}

$args = array(2, 3, 4);
echo call_user_func_array('foo', $args); // 输出 9

You can see that the call_user_func_array function passes the parameters as an array and can receive any number of parameters.

In addition to using the call_user_func and call_user_func_array functions, you can use the $f() form to execute dynamic methods, where $f is a variable . For example:

$func = 'hello';
$func();

The above code will execute the hello() function.

When using dynamic method names, you need to pay attention to following some rules:

1. The method name should be a string type and can contain variables.
2. Method names cannot contain spaces or other illegal characters.
3. Method names should be kept as concise and easy to understand as possible.

In short, the PHP execution function method name can use the call_user_func and call_user_func_array functions, and you can also use the form of a dynamic method name ($f( )), just pay attention to following the rules of method names in the code.

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