Optimize while and SQL in foreach

问题

My code :

$text = '12-name-y-86';
$array = explode('-',$text);
foreach($array as $value) {
    $sql = mysql_query("SELECT * FROM `table` WHERE `pid`='$value' ORDER BY `id` LIMIT 3");
    echo '***'.$value.'***';
    echo '<br />';    
    while($row = mysql_fetch_array($sql)) {
        echo $row['title'];
        echo '<br />';
    }
    echo '<br /><br />';
}

Print :

12

title1

title2

title3

name

ti1

ti2

ti3

y

tle1

tle2

tle3

86

mytitle1

mytitle2

mytitle3

This code work full buy for more values in $text , server has down !

回答1:

Try to select all records in just one query, like this:

$text = '12-name-y-86';
$array = explode('-', $text);
$array = "'" . implode(',', $array) . "'";
$sql = mysql_query("SELECT * FROM `table` WHERE `pid` IN (' . $array . ') ORDER BY `id` LIMIT 3");
while($row = mysql_fetch_array($sql)) {
    echo $row['title'];
    echo '<br />';
}
echo '<br /><br />';

来源：https://stackoverflow.com/questions/23522091/optimize-while-and-sql-in-foreach