mysql select single column as single dimension array in PHP

问题

I'm selecting a single column from my mysql database:

$savedSQL = 'SELECT can_id FROM savedsearches WHERE user_id = "'.mysql_real_escape_string($user_id).'" AND insertTime >= "'.$lastSigTime.'"';
$savedQuery = mysql_query($savedSQL);

And I'd like to return the values as a single dimension, enumerated array such that array[0] = row1, array[1] = row2, etc.

When I put it into an array like this:

while($savedResult = mysql_fetch_array($savedQuery))
    {   $savedArray[] = $savedResult;   }

It returns it as a multi-dimension array so that array[0][0] = row1, array[1][0] = row2, etc.

I was thinking of adding something like this:

while($i=0;$i<count($savedArray);$i++)
{
 $newSavedArray[$i] = $savedArray[$i][0]
}

But is there an easier, more efficient way to accomplish this?

回答1:

You're very close. You just need to access $savedResult[0] to retrieve your column, and append it onto $savedArray

while($savedResult = mysql_fetch_array($savedQuery)) {
  $savedArray[] = $savedResult[0];
}

回答2:

while($savedResult = mysql_fetch_array($savedQuery)) {   
     $savedArray[] = $savedResult['can_id'];   
} 

回答3:

try

$savedArray[] = $savedResult['can_id'];

instead of

$savedArray[] = $savedResult;

回答4:

Here's a method with mysqli and no loop. It takes all your code down to only two lines.

$r = mysqli_query($c,'SELECT can_id FROM savedsearches WHERE user_id = "'.mysql_real_escape_string($user_id).'" AND insertTime >= "'.$lastSigTime.'"');
$savedArray = array_column(mysqli_fetch_all($r,MYSQLI_ASSOC),"can_id");

回答5:

When you initially get the results of mysql you can merge the contents of both while loops into one:

while($result = mysql_fetch_array($savedQuery)) {
    $savedArray[] = $result[0]; // or $result['can_id']
}

来源：https://stackoverflow.com/questions/8204240/mysql-select-single-column-as-single-dimension-array-in-php