您可以使用读取服务器上的数据file_get_contents(). 如果要确保文件存在且可读，请使用is_readable(). 你真的不需要使用trailingslashit() 在本例中，因为您自己正在构建URI。

// path to file under current theme 
$json_file = get_template_directory() . \'/inc/includes/acf-fonticonpicker/icons/selection.json\';

// make sure the file exists and is readable
if ( is_readable( $json_file ) ) {

    // pull the data but don\'t give an error if there is a problem
    if ( ! empty ( $json_content = @file_get_contents( $json_file ) ) ) {

        // convert to an array
        $json_array = json_decode( $json_content, true );
    } else {
        // show error message here
    }
}

文件系统很有趣，如果你知道它的存在，那么有可能/ 和\\ 有时需要在路径中交换。

// BEFORE
// /vagrant/site/wp-content/themes/twentysixteen/inc/includes/acf-fonticonpicker/icons/selection.json

$json_file = str_replace(\'/\', \'\\\\\', $json_file);

or

$json_file = str_replace(\'/\', \'\\\\\\\\\', $json_file);

// AFTER
// \\vagrant\\site\\wp-content\\themes\\twentysixteen\\inc\\includes\\acf-fonticonpicker\\icons\\selection.json

// url of file
$json_file = get_template_directory_uri() . \'/inc/includes/acf-fonticonpicker/icons/selection.json\';

// request the file
$response  = wp_remote_get( $json_file );

try {
    // Note that we decode the body\'s response since it\'s the actual JSON feed
    $json = json_decode( $response[ \'body\' ], true );
} catch( Exception $ex ) {
    $json = NULL;
}