PHP learning diary (1) - the use of classes and functions, php diary_PHP tutorial

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

1. Custom functions

<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 functions in the class

1. Double colon::, no need to instantiate, just call the class name directly

<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);

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