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@ 2015-10-13T10:46:13Z

<?php
$input = Array
        (
           Array
                (
                    (photo_id) => 46795
                ),

            Array
                (
                    (photo_id) => 45112
                ),

            Array
                (
                    (photo_id) => 46763
                ),

            Array
                (
                    (photo_id) => 46593
                )

        );

echo implode(', ', array_map(function ($entry) {
  return $entry['tag_name'];
}, $input));

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
implode: documentation ( source)

preferences:dark modelive preview

44.26 ms | 402 KiB | 5 Q