我使用此代码在docusign文档中添加初始字段。字段完全填充，但锚字符串位于初始字段后面。我想在添加初始字段后删除锚字符串。

$initialHereObjects = [];
    $initialHereTabs = [];

    for ($i = 1; $i <= 10; $i++) {
        $anchorString = '<<Doc' . $i . '.Initial>>'; 
        $initialHereObjects[] = $anchorString;
    }

    foreach ($initialHereObjects as $anchorStringInitialIndex => $anchorStringInitialValue) {
        $inital_here = new \DocuSign\eSign\Model\InitialHere([
            'anchor_string' => "$anchorStringInitialValue", 'anchor_units' => 'pixels',
            'anchor_y_offset' => '10', 'anchor_x_offset' => '-8'
        ]);
        $initialHereTabs[] = $inital_here;
    }
    $signer->setTabs(
        new \DocuSign\eSign\Model\Tabs([
            'initial_here_tabs' => $initialHereTabs
        ])
    );