Alternative to php function overloading-detailed explanation of pseudo-Reloading and detailed explanation of overloading

Alternative to php function overloading-detailed explanation of pseudo-Reloading and detailed explanation of overloading

The replacement method of function overload-pseudo-overload. Let's take a look at the specific instance code.

<? Php // alternative to function overloading-pseudo-overload // indeed, function Overloading is not found in PHP, which makes it impossible for us to handle it in many cases, sometimes you even have to define N parameters behind the function. // when you see func_get_arg, func_get_args, func_num_args, what do you think of when you think of these three functions? Function testOne ($ a) {echo ('just like this with a single parameter ');} function testTwo ($ a, $ B) {echo ('just like this with two parameters ');} function testThree ($ a, $ B, $ c) {echo ('black and black, these are three parameters ');} function test () {$ argNum = func_num_args (); // In this section, you can use $ _ arg = func_get_args () to obtain all the parameters, just use an array. It is not convenient for me to express it below; $ I <$ argNum; $ I ++) {$ _ arg _ {$ I} = func_get_arg ($ I);} switch ($ argNum) {case 1: testOne ($ _ arg_1); bre Ak; case 2: testTwo ($ _ arg_1, $ _ arg_2); break; case 3: testThree ($ _ arg_1, $ _ arg_2, $ _ arg_3); break; default: echo ('this is the case with no arguments '); break;} test (); echo (''); test (1); echo (''); test (1, 2); echo (''); test (1, 2, 3); // These are only used in functions, in fact, the most important thing is to use the class. // if these are used in the class, I don't need to worry about whether the constructor has several parameters, do I? Class test {var $ a = 0; var $ B = 0; function test () {$ argNum = func_num_args (); $ _ arg = func_get_args (); switch ($ argNum) {case 1: $ this-> test1 ($ _ arg [0]); break; case 2: $ this-> test2 ($ _ arg [0], $ _ arg [1]); break; default: $ this-> a = 0; $ this-> B = 1; break ;}} function test1 ($) {$ this-> a = $ a;} function test2 ($ a, $ B) {$ this-> a = $ a; $ this-> B = $ B; }}?>

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