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How to fix “Headers already sent” error in PHP
...k for premature output.
Typical causes:
Print, echo
Intentional output from print and echo statements will terminate
the opportunity to send HTTP headers. The application flow must
be restructured to avoid that. Use functions
and templating schemes. Ensure header() calls occur before messages
ar...
How would you implement an LRU cache in Java?
...use encapsulation here instead of inheritance. This is something I learned from Effective Java.
– Kapil D
Feb 8 '12 at 23:04
10
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How can I convert my Java program to an .exe file? [closed]
...
UPDATE: GCJ is dead. It was officially removed from the GCC project in 2016. Even before that, it was practically abandoned for seven years, and in any case it was never sufficiently complete to serve as a viable alternative Java implementation.
Go find another Java AOT c...
Insert a commit before the root commit in Git?
...ps to achieving this:
Create a new empty commit
Rewrite history to start from this empty commit
We’ll put the new empty commit on a temporary branch newroot for convenience.
1. Create a new empty commit
There is a number of ways you can do this.
Using just plumbing
The cleanest approach is...
Warning message: In `…` : invalid factor level, NA generated
...
If you are reading directly from CSV file then do like this.
myDataFrame <- read.csv("path/to/file.csv", header = TRUE, stringsAsFactors = FALSE)
share
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Convert absolute path into relative path given a current directory using Bash
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Using realpath from GNU coreutils 8.23 is the simplest, I think:
$ realpath --relative-to="$file1" "$file2"
For example:
$ realpath --relative-to=/usr/bin/nmap /tmp/testing
../../../tmp/testing
...
django admin - add custom form fields that are not part of the model
...e also given an example of how you might use these values in form.save():
from django import forms
from yourapp.models import YourModel
class YourModelForm(forms.ModelForm):
extra_field = forms.CharField()
def save(self, commit=True):
extra_field = self.cleaned_data.get('extra_f...
How do I resolve git saying “Commit your changes or stash them before you can merge”?
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You can't merge with local modifications. Git protects you from losing potentially important changes.
You have three options:
Commit the change using
git commit -m "My message"
Stash it.
Stashing acts as a stack, where you can push changes, and you pop them in reverse order.
...
How to get the anchor from the URL using jQuery?
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Please note: to get the hash value of the main window from inside an iFrame, you must use window.top.location.hash instead.
– Paolo Stefan
Jul 17 '13 at 13:00
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How to remove leading and trailing zeros in a string? Python
... is also a general solution that strips both leading and trailing elements from an iterable:
Code
import more_itertools as mit
iterables = ["231512-n\n"," 12091231000-n00000","alphanum0000", "00alphanum"]
pred = lambda x: x in {"0", "\n", " "}
list("".join(mit.strip(i, pred)) for i in iterables...