PHP if/else get_field() with WordPress

问题

I'm trying to give a client some options in the WP backend to customize a carousel that is displayed on their website's homepage. I am using Advanced Custom Fields to handle getting the input from the client. I want to give them two options:

Option #1) Allows the client to insert a string of text to be displayed ('carousel_title_text')

Option #2) Allows the client to upload a logo to be displayed ('carousel_logo')

I want the code to check for title text, and if there is none, display the logo instead. I haven't yet decided what will happen if both fields are empty. Anyway, here is what I've come up with:

<?
if( get_field('carousel_title_text') ) { ?>
  <h2 class="promo"><?php the_field('carousel_title_text');?></h2>
<? } elseif( get_field('carousel_logo') ) {
  the_field('carousel_logo');
}
?>

The 'carousel_title_text' displays as long as there is an input, but when it's empty and 'carousel_logo' is not, it does not properly output the logo. Can anyone tell me what I'm doing wrong or if there's a better approach?

Thanks in advance,

回答1:

You have put else condition on last, that will default text will show if client will not Enter text ot logo. you will used bellow code.

<?php  
 if( get_field('carousel_title_text') ) { ?>
  <h2 class="promo"><?php the_field('carousel_title_text');?></h2>
<?php } elseif( get_field('carousel_logo') ) {
  the_field('carousel_logo');
}else {
  echo " <h2 class="promo"> Default slider title </h2>"
}?>

it's default title client indicate to he has not entered slider text

Hope it's work for you.

回答2:

Try:

<?php 
 $output = (get_field('carousel_title_text')) ? get_field('carousel_title_text'):get_field('carousel_logo');

 echo $output;
?>

回答3:

If I get it right, your problem is not with the If/Else statement but with the logo field. I assume you properly configured this field (carousel_logo) as Image in ACF.

Image fields offer three different Return Value possibilities:

Note: In some versions of ACF you'll found Image Object instead of Image Array, but it's conceptually the same.

None of them will show your image properly if you just use the_field('carousel_logo'); in your template. So, how do you get your logo?

If you want the easiest solution, choose Image URL as Return Value for your logo field and print it like that:

<?
$title = get_field('carousel_title_text');
$logo = get_field('carousel_logo');

if (!empty($title)) : ?>
    <h2 class="promo"><?= $title ?></h2>
<?php elseif (!empty($logo)) : ?>
    <img class="logo" src="<?= $logo ?>">
<?php else: ?>
    <!-- No title, no logo -->
<?php endif ?>

I've changed a little your code, but basically the key line here is:

<img class="logo" src="<?= $logo ?>">

This, or the equivalent:

<img class="logo" src="<?php echo $logo ?>">

should show your image when the title is missing.

Bonus: If you're handling different thumbnail sizes I'd recommend you to use Image Array as Return Value. In that case, $logo would be an Array containing all information (such as sizes, all thumbnail URLs, captions, etc.)

Use:

<img class="logo" src="<?= $logo['sizes']['medium'] ?>">

where 'medium' is your thumbnail size label to output it.

Also, please check official docs on ACF's Image field type for more examples and further explanations.

回答4:

This sounds like it's to do with the settings for the logo, which I'm assuming is an image field? In the Wordpress admin there will be a setting under that field called 'Return value' which can be set to either 'Array' or 'URL'.

If this is set to 'Array', you'd need to store that array to a variable and then access its properties in your markup like so:

<?php

    if ( get_field('carousel_title_text') ) { ?>
        <h2 class="promo"><?php the_field('carousel_title_text'); ?></h2>
    <?php } else{
        $carousel_logo = get_field('carousel_logo');
        if ( $carousel_logo ) { ?>
            <img src="<?php echo $carousel_logo['url']; ?>" />
        <?php } else { ?>
            <h2 class="promo">Default slider title </h2>
        <?php }
    }

?>

Alternatively, you could set your field to only return the image URL and then access it like so:

<?php

    if ( get_field('carousel_title_text' ) { ?>
        <h2 class="promo"><?php the_field('carousel_title_text'); ?></h2>
    <?php } elseif ( $carousel_logo ) { ?>
        <img src="<?php the_field('carousel_logo'); ?>" />
    <?php } else { ?>
        <h2 class="promo">Default slider title </h2>
    <?php }

?>

ACF's documentation on the Image field will provide more info on this.

来源：https://stackoverflow.com/questions/30578415/php-if-else-get-field-with-wordpress

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php

wordpress

if-statement

advanced-custom-fields