php - How can I create a foreach loop that will increase a variable for ranges between 2 dates? -


i have following array:

array ( [0] => array ( [dob] => 1990-01-01 )         [1] => array ( [dob] => 1979-10-01 )          [2] => array ( [dob] => 1982-05-07 )          [3] => array ( [dob] => 1967-08-01 )          [4] => array ( [dob] => 1967-10-01 )         [5] => array ( [dob] => 1965-03-01 )         [6] => array ( [dob] => 1970-03-03 )         [7] => array ( [dob] => 1977-01-03 )          [8] => array ( [dob] => 1993-10-06 )          [9] => array ( [dob] => 1991-09-10 )          [10] => array ( [dob] => 1994-02-02 )          [11] => array ( [dob] => 1994-08-03 )          [12] => array ( [dob] => 1994-08-03 )          [13] => array ( [dob] => 1997-04-03 )          [14] => array ( [dob] => 1997-04-03 )          [15] => array ( [dob] => 1997-04-03 )          [16] => array ( [dob] => 1997-04-03 )          [17] => array ( [dob] => 1947-02-16 )          [18] => array ( [dob] => 1957-10-17 )          [19] => array ( [dob] => 1980-01-03 )          [20] => array ( [dob] => 1985-04-04 )          [21] => array ( [dob] => 1998-02-03 )          [22] => array ( [dob] => 1969-06-06 )          [23] => array ( [dob] => 2000-03-03 )          [24] => array ( [dob] => 1980-04-02 )          [25] => array ( [dob] => 1973-03-03 )          [26] => array ( [dob] => 1984-06-14 )          [27] => array ( [dob] => 1976-10-17 )          [28] => array ( [dob] => 2003-03-01 )          [29] => array ( [dob] => 1972-05-05 ) )

i want count dates between selected years, example between 1970/01/01 , 1980/01/01 should 1. have tried following each:

foreach($data $item){     if ($item['dob'] == ('>=' . '1970-01-01' && '<' . '1980-01-01'))     {         $a++;     }

i pass variables array convert json array populate chart, im getting following output:

{"1970s":30,"1980s":0,"1990s":0}

what syntax please? thanks

it pass dates strtotime,

<?php $startdate = '1970-01-01'; $enddate = '1980-01-01'; foreach($data $item){     if ((strtotime($item['dob'])>=strtotime($startdate)) && (strtotime($item['dob'])<strtotime($enddate)))     {         $a++;     } ?>

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