CODEWITHSUNDEEP
php
crowhill
crowhill

Reputation: 2558

How to call `property_exists()` on a class property from within said class?

If I create the instance of the class like so

$template = new EmailTemplate(array('templateFile' =>'template__test.php'));

Why does the following echo NULL?

class EmailTemplate {
    private $templateFile;

    function __construct($args) {
        foreach($args as $key => $val) {
            if(property_exists($this, $this->{$key})) {
                $this->{$key} = $val;
            }
            echo $this->templateFile;
        }
}

I was expecting the constructor to echo "template__test.php".

Any help?

Upvotes: 0

Views: 405

Answers (1)

Sorin Gheata
Sorin Gheata

Reputation: 329

You should call the constructor like this:

    class EmailTemplate {

        private $templateFile;        

        function __construct( $args ) {

            // Loop through the arguments
            foreach ( $args as $key => $val ) {

                // Check if the current class has a defined variable 
                // named as the value of $val
                if ( property_exists( $this, $key ) ) {

                    // If it has, set it to the passed value
                    $this->$key = $val;

                   // If you pass multiple array items, you should echo $this->$key;
                }

                // Print the defined variable to screen
                echo $this->templateFile;
            }
        }
    }

Upvotes: 1

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