How to return a line number in a PHP script

Question

Is it possible for a PHP script to return a line number in which some command is called? I'm having trouble describing what I want so maybe an example. I have PHP code that calls MySQL on many occasions. In line 49 is: ``` $resultDevice = mysql_query("Some SQL;") or die ("MySQL-Error in settingsU line 49: " . mysql_error()); ``` The text "line 49" I wrote manually. Is it possible to get this number "49" updated if I change my code? It would make my life easier to debug. Of course I can put some other line-specific text into `die`, but lines are much easier to find in a text-editor.

Accepted Answer

You can use the magic constant `__LINE__` for this.

```
echo  __LINE__;
```

will show the line number where that statement is in the file.

How to return a line number in a PHP script

Solution

Problem