我想从函数返回一组值,直到它们存在...... 例如....
function abc($i="3"){
for($a=1;$a<=$i;$a++) {
$name='t'.$i;
$$name = "ae".$a;
}
//now i am returning values
return array($t1,$t2,$t3,$t4,$t5,$t6,$t7,$t8,$t9,$t10);
//but i only want to return $t1,$t2,$t3 depending on $i
}
...谢谢
@therefromhere 我也在循环中创建一个数组,我将粘贴原始代码,以便您可以更好地理解它
function extracting_comments($table, $fields,$condition,$order,$limit){
$query="SELECT ".$fields."
FROM ".$table."
WHERE ".$condition."
ORDER BY ".$order."
LIMIT ".$limit." ";
if($stmt = $this->conn->prepare($query)) {
$stmt->execute();
$row = array_pad(array(), $stmt->field_count, '');
$params = array();
foreach($row as $k=>$v) {
$params[] = &$row[$k];
echo $params[0];
}
call_user_func_array(array($stmt,'bind_result'),$params);
$i=0;
while($stmt->fetch()) {
$i++;
$name='t'.$i;
$$name = array();
foreach ($row as $b=>$elem) {
$atul[$b]=$row[$b];
}
$$name=$atul;
}
return array($t1,$t2,$t3,$t4,$t5,$t6,$t7,$t8,$t9,$t10);
$stmt->close();
}
}
现在他们只有5行数据所以他们没有回报$ t6,$ t7,$ t8,$ t9,$ t10
我想解决它,我正在使用
$extract=extracting_comments($table, $fields,$condition,$order,$limit);
请帮忙......谢谢
答案 0 :(得分:10)
只需在for
循环中构建数组:
function abc($i=3) {
$array = array();
for ($a=1; $a<=$i; $a++) {
$array[] = "ae".$a;
}
return $array;
}
在您编辑问题后,向我们透露了您的实际问题,请参阅此处的建议:
function extracting_comments($table, $fields, $condition, $order, $limit) {
$retVal = array();
$query = "SELECT ".$fields."
FROM ".$table."
WHERE ".$condition."
ORDER BY ".$order."
LIMIT ".$limit." ";
if ($stmt = $this->conn->prepare($query)) {
$stmt->execute();
$row = array_pad(array(), $stmt->field_count, '');
call_user_func_array(array($stmt, 'bind_result'), $row);
while ($stmt->fetch()) {
$retVal[] = $row;
}
$stmt->close();
return $retVal;
}
}
答案 1 :(得分:1)
我相信这会对你有所帮助。你有非常复杂的代码,有很多副作用和bug,你最好考虑重新设置它。返回后放置语句也没有任何效果,因为它不会被调用。
function extracting_comments($table, $fields,$condition,$order,$limit){
$query="SELECT ".$fields."
FROM ".$table."
WHERE ".$condition."
ORDER BY ".$order."
LIMIT ".$limit." ";
if($stmt = $this->conn->prepare($query)) {
$stmt->execute();
$row = array_pad(array(), $stmt->field_count, '');
$params = array();
foreach($row as $k=>$v) {
$params[] = &$row[$k];
echo $params[0];
}
call_user_func_array(array($stmt,'bind_result'),$params);
$i=0;
$result = array();
while($stmt->fetch()) {
$i++;
foreach ($row as $b=>$elem) {
$atul[$b]=$row[$b];
}
$result[]=$atul;
}
$stmt->close();
return $result;
}
}
答案 2 :(得分:0)
随着你继续构建数组会更清晰,那么你就不需要临时变量了:
function abc($i="3") {
$myArray = array();
for($a=1;$a<=$i;$a++) {
$myArray[] = "ae" . $a; // add new values to the end of the array
}
return $myArray;
}
如果要检查变量是否存在(并且不为空),请使用isset()。