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How to solve PHP error 'Notice: Array to string conversion in…'
...u can use print_r.
Alternatively, if you don't know if it's an array or a string or whatever, you can use var_dump($var) which will tell you what type it is and what it's content is. Use that for debugging purposes only.
sh...
Join strings with a delimiter only if strings are not null or empty
... I'm trying to find a simple way to concatenate only non-null or non-empty strings.
7 Answers
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Convert file: Uri to File in Android
...hat you want is...
new File(uri.getPath());
... and not...
new File(uri.toString());
Note: uri.toString() returns a String in the format: "file:///mnt/sdcard/myPicture.jpg", whereas uri.getPath() returns a String in the format: "/mnt/sdcard/myPicture.jpg".
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How to find all duplicate from a List? [duplicate]
I have a List<string> which has some words duplicated. I need to find all words which are duplicates.
9 Answers
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Android Get Current timestamp?
...
The solution is :
Long tsLong = System.currentTimeMillis()/1000;
String ts = tsLong.toString();
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Convert a python dict to a string and back
...n the program is run again.
How would I convert a dictionary object into a string that can be written to a file and loaded back into a dictionary object? This will hopefully support dictionaries containing dictionaries.
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Can you get the column names from a SqlDataReader?
...
var reader = cmd.ExecuteReader();
var columns = new List<string>();
for(int i=0;i<reader.FieldCount;i++)
{
columns.Add(reader.GetName(i));
}
or
var columns = Enumerable.Range(0, reader.FieldCount).Select(reader.GetName).ToList();
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Why does 2 == [2] in JavaScript?
... when evaluating 2 == [2] is basically this:
2 === Number([2].valueOf().toString())
where valueOf() for arrays returns the array itself and the string-representation of a one-element array is the string representation of the single element.
This also explains the third example as [[[[[[[2]]]]]]]...
In C#, what happens when you call an extension method on a null object?
... is actually useful in a few cases:
public static bool IsNullOrEmpty(this string value)
{
return string.IsNullOrEmpty(value);
}
public static void ThrowIfNull<T>(this T obj, string parameterName)
where T : class
{
if(obj == null) throw new ArgumentNullException(parameterName);...
How to extract extension from filename string in Javascript? [duplicate]
...n-capturing group, make it optional
$ # anchor to the end of the string
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