Check if the offset exists

@param   int     $offset The offset
@return  bool
505981
public function offsetExists($offset)
    {
        if(false === $result = parent::offsetExists($offset)) {
            $result = apc_exists($this->getNamespace().'-object_'.$offset);
        }

        return $result;
    }
1164401
public function offsetExists($offset)
    {
        if (strpos($offset, ':') !== false) {
            list($ns, $attr) = explode(':', $offset, 2);
            return $this->_element->hasAttributeNS(Zend_Feed::lookupNamespace($ns), $attr);
        } else {
            return $this->_element->hasAttribute($offset);
        }
    }
832107
public function exists($name, $offset = 0)
    {
        $s = $this->getNormalizedHeaderName($name);
        return isset($this->headerMap[$s][$offset]);
    }
231290
public function offsetExists($offset) {
		return ($this->isCollection)?
				 isset($this->data[$offset])
				:isset($this->data->{$offset});
	}
692807
public function offsetExists($key)
    {
        return Arr::accessible($this->value) && Arr::exists($this->value, $key);
    }
148203
public function offsetExists($offset)
    {
        return is_int($offset) && $offset >= $this->getFirst() && $offset <= $this->getLast();
    }
374325
public function offsetGet( $offset )
	{
		if ( is_int( $offset ) ) {
			return $this->item( $offset );
		}
		else {
			return $this->contains( $offset );
		}
	}
1021742
public function offsetGet ($offset)
    {
        return isset($this->datumData[$offset]) ? $this->datumData[$offset] : false;
    }
532390
public function &offsetGet($offset)
    {
        self::validateOffset($offset);
        $this->existsOrFail($offset);
        return $this->data[$offset];
    }
416885
public function offsetExists($offset)
    {
        $this->loadBlueprint();

        if ($offset === 'title') {
            $offset = 'name';
        }
        return isset($this->blueprint[$offset]);
    }
902882
public function offsetGet($offset)
    {
        return isset($this->conditions[$offset]) ? $this->conditions[$offset] : null;
    }
1257500
public function offsetExists($offset)
    {
        $response = $this->getResponseData();

        if(isset($this->index)){
            $response = $response['items'][$this->index];
        }

        $request  = $this->getRequestData();
        $dirty    = $this->getRequestData(false);
        return isset($response[$offset]) || isset($request[$offset]) || isset($dirty[$offset]);
    }
735659
public function offsetExists($offset): bool
    {
        MDataType::mustBe(array(MDataType::INT));

        return (array_key_exists($offset, $this->list) === true);
    }
988355
public function offsetExists($offset)
    {
        if (!is_int($offset) && !is_string($offset)) {
            throw new RuntimeException('Invalid array offset type: '. gettype($offset));
        }
        return array_key_exists($offset, $this->items);
    }
1072389
public function has($offset = null)
    {
        if ($offset === null) {
            return $this->count() > 0;
        }

        $arr = &$this->getArrayByReference($offset);

        return is_array($arr) ? array_key_exists($offset, $arr) : false;
    }
1365774
public function offsetExists($offset)
    {
        if (gettype($offset) !== 'string' && empty($offset) === false) {
            $msg = "The requested offset must be a string.";
            throw new OutOfRangeException($msg);
        }

        $data = &$this->getDataPlaceHolder();

        return isset($data[$offset]);
    }
1211883
public function offsetExists($reference)
    {
        $reference = $this->mapReference($reference);

        return array_key_exists($reference, $this->container);
    }