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@ 2018-02-13T02:18:32Z

<?php
$dates=[
  '2017-02-28',  // group1
  '2017-03-01',  // group1
  '2017-04-03',  // group2
  '2017-04-04',  // group2
  '2017-04-06',  // group3
  '2017-04-08',  // group4
  '2017-04-09',  // group4
  '2017-04-10'   // group4
];

$copy=$dates;  // make a copy in case $dates is to be used again later
while($copy){  // iterate until the array is empty
    while(!isset($range) || current($copy)==date("Y-m-d",strtotime(substr($range,-10)." +1 day"))){  // iterate while date is new or consecutive
        $range=(!isset($range)?'':substr($range,0,10).' to ').array_shift($copy);  // temporarily store / overwrite the range data
    }
    $result[]=(strlen($range)==10?"$range to $range":$range);  // permanently store range data
    unset($range);  // destroy range string, for next iteration
}
var_export($result);

Output for 5.6.40, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.4, 8.3.6 - 8.3.7: array ( 0 => '2017-02-28 to 2017-03-01', 1 => '2017-04-03 to 2017-04-04', 2 => '2017-04-06 to 2017-04-06', 3 => '2017-04-08 to 2017-04-10', )
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 array ( 0 => '2017-02-28 to 2017-03-01', 1 => '2017-04-03 to 2017-04-04', 2 => '2017-04-06 to 2017-04-06', 3 => '2017-04-08 to 2017-04-10', )

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