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@ 2018-08-23T03:01:14Z

<?php
$thumbs_meta = array(
    'width' => 1024,
    'height' => 768,
    'file' => '2018/08/Penguins.jpg',
    'sizes' => array(
        'thumbnail' => array(
            'file' => 'Penguins-150x150.jpg',
            'width' => 150,
            'height' => 150,
            'mime-type' => 'image/jpeg'
        ),
        'medium' => array(
            'file' => 'Penguins-300x225.jpg',
            'width' => 300,
            'height' => 225,
            'mime-type' => 'image/jpeg'
        ),
        'medium_large' => array(
            'file' => 'Penguins-768x576.jpg',
            'width' => 768,
            'height' => 576,
            'mime-type' => 'image/jpeg'
        ),
        'large' => array(
            'file' => 'Penguins-1024x768.jpg',
            'width' => 1024,
            'height' => 768,
            'mime-type' => 'image/jpeg'
        ),
        'twentyseventeen-thumbnail-avatar' => array(
            'file' => 'Penguins-100x100.jpg',
            'width' => 100,
            'height' => 100,
            'mime-type' => 'image/jpeg'
        )
    )
);

$thumbnail_files = array_column($thumbs_meta['sizes'], 'file');
var_export($thumbnail_files);

echo "\nCount: " , count($thumbnail_files) , "\n\n";
echo "Imploded: " , implode(',', $thumbnail_files);

Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: array ( 0 => 'Penguins-150x150.jpg', 1 => 'Penguins-300x225.jpg', 2 => 'Penguins-768x576.jpg', 3 => 'Penguins-1024x768.jpg', 4 => 'Penguins-100x100.jpg', ) Count: 5 Imploded: Penguins-150x150.jpg,Penguins-300x225.jpg,Penguins-768x576.jpg,Penguins-1024x768.jpg,Penguins-100x100.jpg
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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