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What should you pay attention to when troubleshooting NOTICE in php?
What should you pay attention to when troubleshooting NOTICE in php?
The call seems to have been successful...but I really don’t know what the problem is with this notice
Modified as follows...function update($link, $data, $table, $where = null) {
<code>foreach ( $data as $key => $val ) {
$set .= "{$key}='{$val}',";
}
$set = trim ( $set, ',' );
$where = $where == null ? '' : ' WHERE ' . $where;
$query = "UPDATE {$table} SET {$set} {$where}";
$res = mysqli_query ( $link, $query );
if ($res) {
return mysqli_affected_rows ( $link );
} else {
return false;
}</code>}
·······
I have also defined this set... There will still be problems = =
Reply content:
The call seems to have been successful...but I really don’t know what the problem is with this notice
Modified as follows...function update($link, $data, $table, $where = null) {
<code>foreach ( $data as $key => $val ) {
$set .= "{$key}='{$val}',";
}
$set = trim ( $set, ',' );
$where = $where == null ? '' : ' WHERE ' . $where;
$query = "UPDATE {$table} SET {$set} {$where}";
$res = mysqli_query ( $link, $query );
if ($res) {
return mysqli_affected_rows ( $link );
} else {
return false;
}</code>}
·······
I have also defined this set... There will still be problems = =
You did not define the set variable in the function scope. The reason for reporting the notice is that this is not a fatal error. It just reminds you that using undefined variables may bring adverse consequences.
After reading your revised question, set is still not defined. To be defined before using it. .= is equivalent to using it, and it must be within the function scope, not the foreach scope.
The $set variable is not defined and needs to be defined first above foreach:
<code>$set = '';</code>
The number of rows displayed in general error reports, you can find the problem from the row above the row number
First define a variable $set
Undefined variableUndefined variable
$set must be defined first. If it is not defined, use ‘.=’ directly. This is wrong usage
Use
error_reporting(0)or modify error_reporting = E_ALL & ~E_NOTICE inphp.iniVariable initialization
$set = '';foreach($data as $k=>$v){$set.="{$k}={$v},";}
Define $set = '';
before foreach
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