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<?php $theString = '[[1560467640,1560468709],[1560470287,1560471705]]'; $json = json_decode($theString, true); print_r($json);
Output for 7.1.25 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [0] => Array ( [0] => 1560467640 [1] => 1560468709 ) [1] => Array ( [0] => 1560470287 [1] => 1560471705 ) )

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204.45 ms | 403 KiB | 186 Q