null array mysqli_fetch_assoc ( mysqli_result $result ) void mysqli_free_result ( mysqli_result $result )
w取最大db_id。
if($row=null){
var_dump(123);
}
var_dump($row); if($rowb=array('ww','w123')){
var_dump(234);
}
var_dump($rowb); $rowc=null;
if($rowc=null){
var_dump(345);
}
var_dump($rowc);
NULL | |
int(234) | |
array(2) { | |
[0]=> | |
string(2) "ww" | |
[1]=> | |
string(4) "w123" | |
} | |
NULL |
Returns an associative array that corresponds to the fetched row or NULL
if there are no more rows.
id wint wchar
1 1001 1001www
2 1002 1002www
3 1003 1003www
4 1004 1004www
5 1005 1005www
6 1006 1006www
7 1007 1007www
8 1008 1008www
9 1009 1009www
10 1010 1010www
11 1011 1011www
12 1012 1012www
13 1013 1013www
14 1014 1014www
15 1015 1015www
16 1016 1016www
UPDATE w1 SET wint=id+1000;
UPDATE w1 SET wchar=CONCAT(wint,'www');
DELETE FROM w1 WHERE id>16;
$sql = 'SELECT * FROM w1 ';
if ($result = mysqli_query($link, $sql)) {
while ($row = mysqli_fetch_assoc($result)) {
$w_id = $row['id'];
}
// mysqli_free_result($result);
}
var_dump($w_id);
var_dump($row);
var_dump($result);
string(2) "16" NULL object(mysqli_result)#3 (5) { ["current_field"]=> int(0) ["field_count"]=> int(3) ["lengths"]=> NULL ["num_rows"]=> int(16) ["type"]=> int(0) }
$sql = 'SELECT * FROM w1 ';
if ($result = mysqli_query($link, $sql)) {
while ($row = mysqli_fetch_assoc($result)) {
$w_id = $row['id'];
}
mysqli_free_result($result);
}
var_dump($w_id);
var_dump($row);
var_dump($result);
string(2) "16" NULL
Warning: var_dump() [function.var-dump]: Couldn't fetch mysqli_result
Warning: var_dump() [function.var-dump]: Couldn't fetch mysqli_result
Warning: var_dump() [function.var-dump]: Property access is not allowed yet
Warning: var_dump() [function.var-dump]: Couldn't fetch mysqli_result
Warning: var_dump() [function.var-dump]: Property access is not allowed yet
object(mysqli_result)#3 (5) { ["current_field"]=> NULL ["field_count"]=> NULL ["lengths"]=> NULL ["num_rows"]=> NULL ["type"]=> NULL }
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