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<?php var_dump( implode(',', array_map('intval', explode( ',', '0000614,0000615' ) ) ) );
based on os6QR
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(7) "614,615"