Note 此答案最初包含在@bitstarr\'根据WPSE的Q&；一个模型。

也许其他人会遇到这个问题，所以我将在这里与大家分享我的解决方案。

function make_mce_awesome( $init ) {
    /*
        There are easier things than make \'left/center/right align text\' to use classes instead of inline styles
     */

    // decode
    $formats = preg_replace( \'/(\\w+)\\s{0,1}:/\', \'"\\1":\', str_replace(array("\\r\\n", "\\r", "\\n", "\\t"), "", $init[\'formats\'] ));
    $formats = json_decode( $formats, true );

    // set correct values
    $formats[\'alignleft\'][0][\'classes\'] = \'text--left\';
    $formats[\'aligncenter\'][0][\'classes\'] = \'text--center\';
    $formats[\'alignright\'][0][\'classes\'] = \'text--right\';

    // remove inline styles
    unset( $formats[\'alignleft\'][0][\'styles\'] );
    unset( $formats[\'aligncenter\'][0][\'styles\'] );
    unset( $formats[\'alignright\'][0][\'styles\'] );

    // encode and replace
    $init[\'formats\'] = json_encode( $formats );

    return $init;
}
add_filter( \'tiny_mce_before_init\', \'mkae_mce_awesome\' );

Bonus: 通过添加这一行，您可以使编辑器更加出色。

    $init[\'block_formats\'] = \'Paragraph=p;Heading 2=h2;Heading 3=h3;Heading 4=h4\';

我希望这对某人有用。欢迎改进！

另请参见https://wordpress.stackexchange.com/a/141539

cjbj给出了很好的答案，但必须对其进行双重编码才能获得嵌套数组（而不是对象）并访问类/样式条目：

$formats = preg_replace( \'/(\\w+)\\s{0,1}:/\', \'"\\1":\', str_replace(array("\\r\\n", "\\r", "\\n", "\\t"), "", $init_array[\'formats\'] ));
$formats = json_decode( $formats );

$formats = json_decode(json_encode($formats),true);

// set correct values
$formats[\'alignleft\'][0][\'classes\'] = \'text-left\';
$formats[\'aligncenter\'][0][\'classes\'] = \'text-center\';
$formats[\'alignright\'][0][\'classes\'] = \'text-right\';

// remove inline styles
unset( $formats[\'alignleft\'][0][\'styles\'] );
unset( $formats[\'aligncenter\'][0][\'styles\'] );
unset( $formats[\'alignright\'][0][\'styles\'] );

// encode and replace
$init_array[\'formats\'] = json_encode( $formats );