note 107949 deleted from functions.anonymous by cmb
| From: | cmb@php.net | Date: | Sun, 08 Dec 2019 11:30:33 +0000 |
| Subject: | note 107949 deleted from functions.anonymous by cmb | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-213466@lists.php.net to get a copy of this message | ||
Note Submitter: orwellophile at phpblue dot net
----
You can create a dynamic method with a class, with access to member variables, with a little bit of
trickery:
<?
class DynamicFunction {
var $functionPointer;
var $mv = "The Member Variable";
function __construct() {
$this->functionPointer = function($arg) {
return sprintf("I am the default closure, argument is %s\n", $arg);
};
}
function changeFunction($functionSource) {
$functionSource = str_replace('$this', '$_this', $functionSource);
$_this = clone $this;
$f = '$this->functionPointer = function($arg) use ($_this) {' . PHP_EOL;
$f.= $functionSource . PHP_EOL . "};";
eval($f);
}
function __call($method, $args) {
if ( $this->{$method} instanceof Closure ) {
return call_user_func_array($this->{$method},$args);
} else {
throw new Exception("Invalid Function");
}
}
}
if (!empty($argc) && !strcmp(basename($argv[0]), basename(__FILE__))) {
$dfstring1 = 'return sprintf("I am dynamic function 1, argument is %s, member
variables is %s\n", $arg, $this->mv);';
$dfstring2 = 'return sprintf("I am dynamic function 2, argument is %s, member
variables is %s\n", $arg, $this->mv);';
$df = new DynamicFunction();
$df->changeFunction($dfstring1);
echo $df->functionPointer("Rabbit");
$df->changeFunction($dfstring2);
$df->mv = "A different var";
echo $df->functionPointer("Cow");
};
?>