PHP function overloading Alternative Methods _php Tutorial

Workarounds for PHP function overloading

For weakly typed languages, PHP function overloading is not as normal as OOP. Weak types are inherently indistinguishable, so they cannot be implemented. However, it is possible to implement a simple pseudo-overload by using the following method.

Workaround for function overloading-pseudo-overloading, see a specific instance code below.

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Workaround for function overloading-pseudo overload // Indeed, there is no concept of function overloading in PHP, so many times we are unable to do some processing, and sometimes we have to define N parameters after the function. What do you think of when you see Func_get_arg,func_get_args,func_num_args, these three functions? function Testone ($a) { Echo (' A parameter just so '); } function Testtwo ($a, $b) { Echo (' Two parameters in this case '); } function Testthree ($a, $b, $c) { Echo (' Black black, this is three parameters '); } function Test () { $argNum = Func_num_args (); This paragraph can actually use $_arg = Func_get_args () to get all the parameters, just to use the array, not convenient my following expression, hehe for ($i = 0; $i < $argNum; $i + +) { $_arg_ {$i} = Func_get_arg ($i); } Switch ($argNum) { Case 1: Testone ($_arg_1); break; Case 2: Testtwo ($_arg_1, $_arg_2); break; Case 3: Testthree ($_arg_1, $_arg_2, $_arg_3); break; Default: Echo (' This is the case without parameters '); break; } } Test (); Echo ('); Test (1); Echo ('); Test (1, 2); Echo ('); Test (1, 2, 3); These are only used in the function, in fact, the most important or in the application of the class If this is used in a class, I don't have to worry about whether the constructor has a few arguments, does it? Class Test { var $a = 0; var $b = 0; function Test () { $argNum = Func_num_args (); $_arg = Func_get_args (); Switch ($argNum) { Case 1: Test1, $this ($_arg [0]); break; Case 2: $this-Test2 ($_arg [0], $_arg [1]); break; Default: $this a = 0; $this B = 1; break; } } function Test1 ($a) { $this a = $a; } function test2 ($a, $b) { $this a = $a; $this B = $b; } } ?>

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