duanran6441
2015-08-23 15:51 阅读 47
已采纳

是否允许在OOP PHP方法中使用过程函数?

I am learning Object oriented PHP and I am wondering if it is allowed to use procedural functions inside methods.

For example in WordPress you have a function get_option(); to get a value by name from the options database table. Is it allowed to do something like this:

class ExampleClass {

   public static function ExampleMethod( $optionName ) {
      if( get_option( $optionName ) ) {
         return get_option( $optionName ) + 20;
      }     
   }

}
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2条回答 默认 最新

  • 已采纳
    doubingjiu3199 doubingjiu3199 2015-08-23 16:29

    Is it allowed to use procedural functions inside OOP PHP methods?

    Well the first question would be is it even possible. And why don't we try it out:

    class A {
    
        public static function randomStaticMethod() {
            echo "Function call:" . phpversion();
        }
    
        public function randomMethod() {
            echo "Function call:" . phpversion();
        }
    
    }
    
    $o = new A();
    $o->randomMethod();
    
    A::randomStaticMethod();
    

    And you will see it will work as expected, no errors no warnings, just:

    Function call: ...
    Function call: ...
    

    So it's definitely possible. Now to your question: Is it allowed?

    Simple question, which should answer your question:

    How would you get the length of a string, when you wouldn't be allowed to use functions like strlen() in a class?

    So yes it's also definitely allowed and used.


    Now a few other things, which might be useful to know. If you work with namespaces you have to be careful.

    As example:

    namespace I_AM_A_NAMESPACE;
    
    function strlen() {
        echo "nope";
    }
    
    echo strlen("xyz");
    echo \strlen("xyz");
    

    Your output will be:

    nope
    3
    

    So if you work with namespaces you have to know in which namespace you are and which function you want to call. So if you want to call the global function strlen() and you want to take the save route, always put a \ in front of it, to make sure you call the global strlen() function.

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  • doudu161481 doudu161481 2015-08-23 16:37

    You could go completely static with the code below. I just used the number 1 as the parameter and I used Return 1 as example code so something can be returned. I'd personally recommend allocating objects dynamically especially if your system has limited memory, but here's my code:

    <?php
    echo ExampleClass::ExampleMethod(1);
    exit();
    
    class ExampleClass {
    
    public static function get_option( $optionName ) {
        //do processing here
    return 1;
    }
    
    public static function ExampleMethod( $optionName ) {
    if( ExampleClass::get_option( $optionName ) ) {
        return ExampleClass::get_option( $optionName ) + 20;
    }
    }
    
    }
    ?>
    
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