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Check whether an array is empty [duplicate]
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There are two elements in array and this definitely doesn't mean that array is empty. As a quick workaround you can do following:
$errors = array_filter($errors);
if (!empty($errors)) {
}
array_filter() function's default behavior will remove all values from ...
Jackson - Deserialize using generic class
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edited Jan 22 at 13:26
Naman
68.4k2121 gold badges...
What does passport.session() middleware do?
...s as a middleware to alter the req object and change the 'user' value that is currently the session id (from the client cookie) into the true deserialized user object.
Whilst the other answers make some good points I thought that some more specific detail could be provided.
app.use(passport.sessio...
PHP validation/regex for URL
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I used this on a few projects, I don't believe I've run into issues, but I'm sure it's not exhaustive:
$text = preg_replace(
'#((https?|ftp)://(\S*?\.\S*?))([\s)\[\]{},;"\':<]|\.\s|$)#i',
"'<a href=\"$1\" target=\"_blank\"&...
How can I distinguish whether Switch,Checkbox Value is changed by user or programmatically (includin
How to implement method isNotSetByUser() ?
16 Answers
16
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How to get everything after a certain character?
...whatIWant;
If you also want to check if the underscore character (_) exists in your string before trying to get it, you can use the following:
if (($pos = strpos($data, "_")) !== FALSE) {
$whatIWant = substr($data, $pos+1);
}
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Best practice to validate null and empty collection in Java
I want to verify whether a collection is empty and null . Could anyone please let me know the best practice.
9 Answers
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How to know what the 'errno' means?
...) , I get an errno=2 . What does it mean? How can I know the meaning of this errno ?
15 Answers
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How can I override the OnBeforeUnload dialog and replace it with my own?
...on() {
return 'You have unsaved changes!';
}
Here's a reference to this from Microsoft:
When a string is assigned to the returnValue property of window.event, a dialog box appears that gives users the option to stay on the current page and retain the string that was assigned to it. The def...
difference between primary key and unique key
...able
In some DBMS it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique key can be NULL ; multiple rows can have NULL values and t...