一、自定义函数
<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>$c</span><span>;
}
add(</span>1,2);输出结果：
add test:3
二、调用类里面函数
1、双冒号::，不用实例化，直接类名调用
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<span>class</span><span> test{
</span><span>public</span> <span>function</span> add(<span>$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、->，实例化后的对象使用
<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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