你有问题的原因是0 当get_post_meta call返回false，也等于0.

if( !get_post_meta( $post_id, \'some-non-existant-field\', true ) == 0 )

if( get_post_meta( $post_id, \'some-existing-field\', true ) == 0 )

此外，0 不同于\'0\', 一个是字符串值，另一个是实际的数值。自定义字段值存储为字符串，因此比较应遵循。。

if( get_post_meta( $post_id, \'some-existing-field\', true ) == \'0\' )

我意识到我不擅长解释这一点，所以我希望这能有所帮助（或者其他人能更好地解释）。

对于extand Marc Duncans（也称为t31os），回答：

您可以通过多种方式提问”if ( $some_val_A IS $some_val_B )“.相等与相同之间存在差异。

$real_world_ex = get_post_meta( $post_id, \'ratings_users\', true );

// Example: test this in your functions.php
function wpse26016_test_vars( $real_world_ex = \'\' )
{
    $some_int = (int) 1;
    $some_bool = (bool) 1;
    $some_string = (string) 1;

    echo \'<pre>\';
        echo \'I\\\'m an integer: \';
            var_dump( $some_int );
        echo \'<br />I\\\'m some boolean: \';
            var_dump( $some_bool );
        echo \'<br />I\\\'m some string: \';
            var_dump( $some_string );

    echo \'<hr><strong>Now we can see some comparison<strong><br />\';
        echo \'<br />I test if integer is <em>equal</em> boolean (notice the 2 "="-signs): \';
            var_dump( $some_int == $some_bool );
        echo \'<br />I test if integer is <em>identical</em> boolean (notice the 3 "="-signs): \';
            var_dump( $some_int === $some_bool );
        echo \'<br />I test if integer is <em>not equal</em> boolean: \';
            var_dump( $some_int != $some_bool );
        echo \'<br />I test if integer is <em>not identical</em> boolean: \';
            var_dump( $some_int !== $some_bool );

    echo \'<hr><strong>Now some real world example<strong><br />\';
        echo \'<br />This is the dump of what\'s inside your meta data: \';
            var_dump( $real_world_ex );

        echo \'<br />I test if integer is <em>equal</em> to your meta data: \';
            var_dump( $some_int == $real_world_ex );
        echo \'<br />I test if integer is <em>identical</em> to your meta data: \';
            var_dump( $some_int === $real_world_ex );

        echo \'<br />I test if boolean is <em>equal</em> to your meta data: \';
            var_dump( $some_bool == $real_world_ex );
        echo \'<br />I test if boolean is <em>identical</em> to your meta data: \';
            var_dump( $some_bool === $real_world_ex );

        echo \'<br />I test if string is <em>equal</em> to your meta data: \';
            var_dump( $some_string == $real_world_ex );
        echo \'<br />I test if string is <em>identical</em> to your meta data: \';
            var_dump( $some_string === $real_world_ex );
    echo \'<pre>\';
}

始终使用此功能查看是否正确：）

根据您的澄清，我建议如下：

<?php 
$rating = get_post_meta( $post_id, \'ratings_users\', true );

if ( \'0\' < $rating ) {
    the_ratings();
}
?>

<?php 
$rating = get_post_meta( $post_id, \'ratings_users\', true );

if ( \'\' != $rating && \'0\' != $rating ) {
    the_ratings();
}
?>

这里需要注意的重要一点是get_post_meta() 返回empty string 如果未设置post meta值。

我很感激所有的答案，但是$post\\u id是问题所在，应该是$post->id

<?php if(get_post_meta( $post->ID, \'ratings_users\', true ) ==\'0\' ) {
}else{
the_ratings();
} ?>

Try this:

if ( get_post_meta( $post_id, \'ratings_users\', true ) != 0 ) {
    the_ratings();
} else {
    // Do nothing here
}

get_post_meta($id, \'key\', true)

if(!get_post_meta()) {
    // when field doesn\'t exist (false) or the value is integer 0 or empty string \'\'
} else {
    // when the field exists
}