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@ 2014-08-05T06:48:30Z

<?php
$profile_fields = array(
            'id',
            'first-name',
            'last-name',
            'headline',
            'location:(name)',
            'industry',
            'num-connections',
            'summary',
            'specialties',
            'picture-url',
            'email-address',
            'last-modified-timestamp',
            'interests',
            'educations',
            'date-of-birth',
        );

echo implode(',',$profile_fields);

Output
Performance
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References
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implode: documentation ( source)

preferences:dark modelive preview

28.68 ms | 402 KiB | 5 Q