使用PHP计算数组中的实例

Question

I'm trying to get a count of how many instances of 'UnitSqFeet' are within a certain range. For example how many instances are between 0 - 175, or 176 - 300.

Here is a part example of the array (it contains 46 in total).

Array ( 
    [0] => Array ( [UnitNumber] => 1.03 [UnitSqFeet] => 60.75 ) 
    [1] => Array ( [UnitNumber] => 1.04 [UnitSqFeet] => 160.39 ) 
    [2] => Array ( [UnitNumber] => 1.05 [UnitSqFeet] => 231.55 ) 
    [3] => Array ( [UnitNumber] => 1.06 [UnitSqFeet] => 280.24 )
)

The 'UnitSqFeet' is a string so I'm assuming it'll have to be converted somewhere in there.

I managed to get this working as below but it would only output this in the first cell of an html table and not the rest. After doing some research on here I understand it's because I was repeating the query for every cell and after the first it had already retrieved all the rows. Not sure if there's a solution whereby I can just reset the query?

$counter = 0;
while ($units = odbc_fetch_array($result)) {
    $num = $units['UnitSqFeet'];
    $float = (float)$num;
    if ($float > 0 && $float < 175) {
        count($float);
        $counter++;
    };  
};
echo $counter;

Answer 1

Try as

$count = $count2 = 0;
$result = array();
foreach(array_column($arr,'UnitSqFeet') as $key => $value){
    if(round($value) <= 170){
        if(!isset($result['0-170'])) $result['0-170'] = $count++;
        $result['0-170'] = $count++;
    }else{
        if(!isset($result['171-300'])) $result['171-300'] = $count2++;
        $result['171-300'] = $count2++;
    }
}
print_r($result);

Fiddle