为什么此全局数组从回调函数返回空值

这让我疯狂了好几个小时。。。请告诉我为什么$ppk\\u fields数组在ppk\\u field\\u回调函数中为空？请注意，它在ppk\\u default\\u id函数中返回正确的值，但这不是回调函数。非常感谢。

ppk。php

class Ppk {

    public function ini() {
        add_action( \'admin_menu\', array( $this, \'add_ppk_p_menu\' ) );
    }

    public function add_ppk_p_menu() {
        add_submenu_page( \'tools.php\', \'PPK PLUGIN\', \'PPK PLUGIN\', \'manage_options\', \'ppk_p\', array( $this, \'ppk_build_dashboard\' ) );
    }

    public function ppk_build_dashboard() {
        require_once plugin_dir_path( __FILE__ ) . \'ppk-builder.php\';
    }

}

if ( class_exists( \'Ppk\' ) ) {
    $ppk = new Ppk();
    $ppk->ini();
}

ppk生成器。php

$ppk_sections = [
    \'section_1\' => [
        \'title\' => \'Group One\'
    ]
];

$ppk_fields = [
    \'field 1\' => [
        \'title\'   => \'Fieald One\',
        \'type\'    => \'text\',
        \'section\' => \'section_1\',  
        \'default\' => \'default\'
    ]
];

register_setting( \'ppk-builder\', \'ppk-builder\', \'ppk-builder_validate\' );

    foreach ($ppk_sections as $id => $value) {
        add_settings_section( $id, $value[\'title\'], \'ppk_section_callback\', \'ppk_p\');
    }

    foreach ($ppk_fields as $id => $value) {       
        add_settings_field( $id, $value[\'title\'], \'ppk_field_callback\', \'ppk_p\', $value[\'section\'], $id );
    }

function ppk_section_callback() {return null;}

function ppk_default_id( $id ) {
    global $ppk_fields;

    return $ppk_fields[ $id ][\'default\'];
}

function ppk_field_callback($id) {
    global $ppk_fields;

    $option = get_option(\'ppk-builder\');
    $id_field = isset($option[$id]) ? $option[$id] : ppk_default_id($id);

    switch ($ppk_fields[$id][\'type\']) {
        case \'text\':        
            echo \'<input type="text" name="ppk-builder[\' . $id . \']" value="\' . $id_field . \'"/>\';
        break;
    }
}


settings_fields( \'ppk-builder\' );
do_settings_sections( \'ppk_p\' );

class PPK_Settings { private $sections; private $fields; function __construct() { $this->sections = [ \'section_1\' => [ \'title\' => \'Group One\' ] ]; $this->fields = [ \'field 1\' => [ \'title\' => \'Fieald One\', \'type\' => \'text\', \'section\' => \'section_1\', \'default\' => \'default\' ] ]; } function register() { register_setting( \'ppk-builder\', \'ppk-builder\', \'ppk-builder_validate\' ); foreach ($this->sections as $id => $value) { add_settings_section( $id, $value[\'title\'], array( $this, \'section_callback\' ), \'ppk_p\'); } foreach ($this->fields as $id => $value) { add_settings_field( $id, $value[\'title\'], array( $this, \'ppk_field_callback\' ), \'ppk_p\', $value[\'section\'], $id ); } } // etc... other methods go here }

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