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@ 2019-10-20T08:01:49Z

<?php
$a = Array
(
    'Tennis 1' => Array
        (
            'IntervalTime' => Array
                (
                    'Lun' => Array
                        (
                            '0' => '10:00',
                            '1' => '11:00',
                            '2' => '12:00',
                            '3' => '13:00',
                            '4' => '14:00',
                            '5' => '15:00',
                            '6' => '16:00',
                            '7' => '17:00',
                            '8' => '18:00',
                            '9' => '19:00',
                            '10' => '20:00'
                        ),

                    'Mar' => Array
                        (
                            '0' => '12:00',
                            '1' => '13:00',
                            '2' => '14:00',
                            '3' => '15:00'
                        ),

                    'Mer' => Array
                        (
                            '0' => '09:00',
                            '1' => '10:00',
                            '2' => '11:00',
                            '3' => '12:00',
                            '4' => '13:00'
                        ),

                    'Gio' => Array
                        (
                            '0' => '09:00',
                            '1' => '10:00',
                            '2' => '11:00',
                            '3' => '12:00',
                            '4' => '13:00'
                        ),

                    'Ven' => Array
                        (
                            '0' => '09:00',
                            '1' => '10:00',
                            '2' => '11:00',
                            '3' => '12:00',
                            '4' => '13:00'
                        ),

                    'Sab' => Array
                        (
                            '0' => '09:00',
                            '1' => '10:00',
                            '2' => '11:00',
                            '3' => '12:00',
                            '4' => '13:00',
                            '5' => '14:00',
                            '6' => '15:00',
                            '7' => '16:00',
                            '8' => '17:00',
                            '9' => '18:00'
                        ),

                    'Sun' => Array
                        (
                            '0' => '09:00',
                            '1' => '10:00',
                            '2' => '11:00',
                            '3' => '12:00',
                            '4' => '13:00',
                            '5' => '14:00',
                            '6' => '15:00',
                            '7' => '16:00',
                            '8' => '17:00',
                            '9' => '18:00'
                        )

                )

        )
);
$StartTime = "14:00"; $EndTime = "16:30";
array_walk_recursive($a['Tennis 1']['IntervalTime'], function(&$v) use ($StartTime, $EndTime){
	if($v >= $StartTime && $v <= $EndTime) $v = false;
});
$f['Tennis 1']['IntervalTime'] = array_map('array_filter', $a['Tennis 1']['IntervalTime']);
print_r($f);

array_map: documentation ( source)
print_r: documentation ( source)
array_walk_recursive: documentation ( source)

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