PHP learning diary (1) - the use of classes and functions

1. Custom function

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

Output result:

add test:3

2. Call the function in the class

1. Double colon::, no need to instantiate, direct class name call

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

2. - >, the instantiated object uses

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

The above introduces the PHP learning diary (1) - the use of classes and functions, including objects. I hope it will be helpful to friends who are interested in PHP tutorials.