我犯了一个最奇怪的错误。

尝试显示自定义循环时，出现以下错误：

Fatal error
: Uncaught Error: Call to a member function have_posts() on array in /.../custom-page.php:42 Stack trace: #0 /.../wp-includes/template-loader.php(106): include() #1 /.../wp-blog-header.php(19): require_once(\'/data/sites/web...\') #2 /.../index.php(17): require(\'/data/sites/web...\') #3 {main} thrown in
/.../custom-page.php
on line
42

这太奇怪了，因为我看到了“在null上调用成员函数”或其他错误，但在数组上没有，这通常对这个函数很好。

我的custom-page.php 有如下内容：

<?php get_header(); ?>

<div class="container">
    <div class="row">
        <div class="col-12">
            <h1><?php the_title(); ?></h1>
            
            <div class="grid row">
                
                <?php foreach( $programs as $program ) {
                    
                    $custom_query = get_posts( [
                        \'post_type\'=> \'artikel\',
                        \'post_status\' => \'publish\',
                        \'posts_per_page\' => 1,
                        \'order\' => \'DESC\',
                        \'orderby\' => \'date\',
                        \'meta_query\' => [
                            [ \'key\' => \'layout\', \'value\' => \'synopsis\' ],
                            [ \'key\' => \'programs\', \'value\' => \'"\' . $program . \'"\', \'compare\' => \'LIKE\' ]
                            ]
                        ] );
                    
                    if( $custom_query->have_posts() ) {
                        
                        echo \'test\';
                        
                    }
                    
                } ?>
                
            </div>
            
        </div>
    </div>
</div>

<?php get_footer(); ?>

$array = array( 1, 2, 3 );
$array->foo(); // error - $array is an array, not an object

class MyClass {
    public function foo() {
        echo \'it works\';
    }
}
$object = new MyClass;
$object->foo(); // works - $object is an object (or a class instance) and the
                // method foo() exists and callable/public

$custom_query = new WP_Query( [
    // your args here
] );