PHP function explanation_PHP tutorial

The real power of PHP comes from its functions, but some PHP functions are not fully utilized, and not everyone reads the manual and function reference page from beginning to end. Here we will introduce you to these practical functions. Functions and features.

　　1. Functions with any number of parameters
You may already know that PHP allows defining functions with optional parameters. But there are also methods that completely allow any number of function arguments. The following are examples of optional parameters:

The following is the quoted content:
//functionwith2optionalarguments
functionfoo($arg1=",$arg2="){
echo "arg1:$ arg1 ";
echo "arg2:$arg2 ";
}

foo('hello',world');
/*prints:
arg1:hello
arg2:world
*/

foo();
/*prints:
arg1:
20. arg2:
*/

Now let’s see how to create a function that accepts any number of arguments . This time you need to use the func_get_args() function:

The following is the quoted content:
//yes,theargumentlistcanbeempty
functionfoo(){
//returnsanarrayofallpassedarguments
$args=func_get_args ();
foreach($argsas$k=>$v){
echo “arg”.($k 1).”:$v ”;
}
}

foo();
/*printsnothing*/

foo('hello'); arg1:hello
*/

foo('hello','world','again');
/*prints
arg1:hello
arg2:world
arg3:again
*/

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