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// if no image, return null
if( $image == null )
return;
// shorthand for if
echo $image['alt'] ? $image['alt'] : $image['title'] ? $image['title'] : 'No ALT-Tag';
// equal
if( $image['alt'] ) {
echo $image['alt'];
} elseif( $image['title'] ) {
echo $image['title'];
} else {
echo 'No ALT-Tag';
}
My answer refers to the output of a gallery field from ACF. If you want to use the function for a single image (from ACF), you need to do the following:
<?php $image = get_field( 'image' ); ?>
<img src="" alt="<?php image_alt_tag( $image ); ?>" />
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