How to call function from php class in function from web page

Question

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?

Michael Berkowski · Accepted Answer · 2012-11-16 02:52:47Z

3

$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(); 
}

answered Nov 16, 2012 at 2:52

Michael Berkowski

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Comments

Maël Nison · Accepted Answer · 2012-11-16 02:53:12Z

0

You seems to be looking for closure support, which are only available for anonymous functions.

And according to your code sample, it doesn't seems to be a right use case. Maybe you should just pass this value as function parameter ?

answered Nov 16, 2012 at 2:53

Maël Nison

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