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@ 2016-04-28T09:54:40Z

<?php

class Foo {
    
    private $items;
    
    function __construct($a) {
        $this->items = []; 
        $this->items['params'] = []; 
        $this->items['a'] = $a; 
    }   
        
    function __get($name) {
        if ($name === 'a') {
            return $this->items['a'];
        }   
            
        return null;
    }   
        
    function __isset($a) {
        var_dump($a);
        return isset($this->items->params[$a]);
    }   
        
    function bar() {
        if (isset($this->a['xyz'])) {
            return 'yes';
        }   
        return 'no';
    }   

    function baz() {
        $tmp = $this->a;

        if (isset($tmp['xyz'])) {
            return 'yes';
        }   
        return 'no';
    }   
}

$f = new Foo(['xyz' => true]);
var_dump($f->bar());
var_dump($f->baz());

Output for 7.0.6 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12: string(1) "a" string(2) "no" string(3) "yes"
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.5: string(3) "yes" string(3) "yes"

preferences:dark modelive previewkey bindings

88.18 ms | 407 KiB | 5 Q