PHP uses $ this if not in object context
I have the following class:
class Decode {
public $code;
public $codeStore;
public $store;
public $varName;
public $storeNew = array();
public $storeNew = array();
public function __construct($code) {
$this->code = $code;
$this->codeStore = $code;
$this->varName = substr($this->code, 0, 30);
$this->varName = str_replace("var ", "", $this->varName);
$this->varName = substr($this->varName, 0, strpos($this->varName, "=[\""));
}
public function chrToVar() {
// The line below is line 38
$this->code = preg_replace_callback('/'.$this->varName.'\[([0-9]+)\]/', function($matches) { return $this->storeNew[$matches[1]]; }, $this->code);
}
}
$script = new Decode('stuff');
$script->chrToVar();
When I run this code, I get the following error:
Fatal error: Using $ this if not in the context of an object in /var/www/programs/decode.php on line 38
Why is this happening? I suppose it has something to do with the parameter that the function has in preg_replace_callback
, but I have no idea how to fix it.
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1 answer
Since PHP 5.4 $this
can be used in anonymous functions and refers to the current object, a simple example:
class Decode {
public $code;
public function __construct( $code ) {
$this->code = $code;
}
public function chrToVar() {
$this->code = preg_replace_callback( '/\w+/',
function( $matches ) {
var_dump( $this );
}, $this->code
);
}
}
$script = new Decode( 'stuff' );
$script->chrToVar();
For version 5.3, you can use a workaround, but it only works with public properties:
$self = $this;
$this->code = preg_replace_callback( '/\w+/',
function( $matches ) use ( $self ) {
var_dump( $self );
}, $this->code
);
My advice is to upgrade to at least 5.4 if possible.
More information: PHP 5.4 - "closing $ this support"
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