使用PHP中的多个参数调用Javascript函数

I'm trying to send two parameters from PHP to Javascript, but I get second undefined parameter.

<?php echo '<button onclick="deleteImage(\'' . $image->photo_id . ',' . $content->content_id . '\')" >Delete</button>'; ?>

Please help, thank you

I think you forget to escape some ' :

<?php echo '<button onclick="deleteImage(\'' . $image->photo_id . '\',\'' . $content->content_id . '\')" >Delete</button>'; ?>