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);以上就介绍了PHP学习日记（一）——类、函数的使用，包括了对象方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
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