douping3860 2012-11-16 02:50
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如何从网页上的函数中调用php类的函数

Code example;

PHP Web Page: (index.php)

 <html><head></head>
    <body>
    <?php 
    include("class_validation.php");
    $val = new validation();

        if(isset($_POST['action'])) doSomething();

    function doSomething() {
        $val->validate(); //I AM UNABLE TO DO THIS!
    }
    ?>
    </body>
    </html>

PHP file: (class_validation.php)

<?php
class validation()
{
    function validate(){
        //some validation
    }
}
?>

QUESTION: How can I call a function from the 'class_validation.php' file in a function I created in my PHP web page? I can correctly call the function doSomething() as well as call the function $val->validate(); when not located in another function. I there a way to do this?

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2条回答 默认 最新

  • douya2982 2012-11-16 02:52
    关注

    $val is out of scope in that doSomething() function call. Pass it as a parameter to the function:

    // Define the function to accept a parameter. Use a type hint to be sure it is 
// a validation object
function doSomething(validation $val) {
  $val->validate(); 
}

if(isset($_POST['action'])) doSomething($val);

    (PHP documentation on type hinting)

    Alternatively, and not recommended, you may use the global keyword inside the function to reference the global $val.

    function doSomething() {
  // Don't do it this way. The func parameter is preferred
  global $val;
  $val->validate(); 
}
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