PHP learning diary (1) -- usage of classes and functions, php diary _ PHP Tutorial

PHP learning diary (1)-usage of classes and functions, and php diary. PHP learning diary (1)-usage of classes and functions, php diary 1. UDF functionadd ($ a, $ B) {$ c $ a + $ B; echoaddtest :; echo $ c; return $ c;} add (1, 2); output PHP learning diary (1) -- Use of classes and functions, php diary

I. user-defined functions

function add($a,$b){    $c=$a+$b;    echo 'add test:';    echo $c;    return $c;}add(1,2);

Output result:

add test:3

II. call functions in the class

1. double colon:, directly called by class name without instantiation

class test{    public function add($a,$b){        $c=$a+$b;        echo 'class test:';            echo $c;                return $c;    }}test::add(1,2);

2.->, used by the instantiated object

class test{    public function add($a,$b){        $c=$a+$b;        echo 'class test:';            echo $c;                return $c;    }}$object=new test();$object->add(1,3);

Usage (1) -- Use of classes and functions, php diary I. user-defined function add ($ a, $ B) {$ c = $ a + $ B; echo 'add test: '; echo $ c; return $ c;} add (1, 2); output...