if-statement上的语法错误

Question

我试图根据自定义的post类型输出不同的文本，但我得到了一个语法错误，我认为这是由于多个if语句造成的。问题是我对PHP的了解非常有限。有什么想法吗？

<?php

if ( 'lettering' == get_post_type() ) {

    <?php if( function_exists( 'attachments_get_attachments' ) ) { 
            $attachments = attachments_get_attachments();
            $total_attachments = count( $attachments );
            if( $total_attachments ) : ?>
            <ul id="process"><span>Process:</span>
            </ul>
            <br>
                <?php endif; ?> <?php } ?>

} elseif ( 'type' == get_post_type() ) {

    <?php if( function_exists( 'attachments_get_attachments' ) ) { 
            $attachments = attachments_get_attachments();
            $total_attachments = count( $attachments );
            if( $total_attachments ) : ?>
            <ul id="process"><span>Additional Shots</span>
            </ul>
            <br>
                <?php endif; ?> <?php } ?>
}

?>

Answer 1

删除php开头的标签，如: change：

<?php if ( 'lettering' == get_post_type() ) {

    this one --> <?php if( function_exists( 'attachments_get_attachments' ) ) { 

至

<?php if ( 'lettering' == get_post_type() ) {

    if( function_exists( 'attachments_get_attachments' ) ) { 
      .......

在elseif中也是类似的

添加：

<?php
if ( 'lettering' == get_post_type() ) {
    if( function_exists( 'attachments_get_attachments' ) ) { 
        $attachments = attachments_get_attachments();
        $total_attachments = count( $attachments );
        if( $total_attachments ): 
?>
                <ul id="process"><span>Process:</span>
                </ul>
                <br>
<?php 
        endif; 
    }
} else if ( 'type' == get_post_type() ) {
    if( function_exists( 'attachments_get_attachments' ) ) { 
        $attachments = attachments_get_attachments();
        $total_attachments = count( $attachments );
        if( $total_attachments ): 
?>
                <ul id="process"><span>Additional Shots</span>
                </ul>
                <br>
<?php 
        endif;
    }
}
?>

Answer 2

像这样弹出MarcB注释是不理想的。如果你正在用一些PHP注入编写一个主要基于HTML的文件，那么另一种语法是很棒的，否则我会使用HEREDOC这样的东西来让事情更容易识别：

<?php

if ( 'lettering' == get_post_type() ) {
  if( function_exists( 'attachments_get_attachments' ) ) {
    $attachments = attachments_get_attachments();
    $total_attachments = count( $attachments );

    if( $total_attachments ) {
      echo <<<EOSTRING

      <ul id="process"><span>Process:</span>
      </ul>
      <br>

EOSTRING
;
    }
  }
} elseif ( 'type' == get_post_type() ) {
  if( function_exists( 'attachments_get_attachments' ) ) {
    $attachments = attachments_get_attachments();
    $total_attachments = count( $attachments );

    if( $total_attachments ) {
      echo <<<EOSTRING

      <ul id="process"><span>Additional Shots</span>
      </ul>
      <br>

EOSTRING
;
    }
  }
}