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How to fix “Headers already sent” error in PHP When running my script, I am getting several errors like this: Warning: Cannot modify header information - headers already sent by (output started at /some/file.php:12) in /some/file.php on line 23 The lines mentioned in the error messages contain header() and setcookie() calls. What could be the reason for this? And how to fix it? No output before ..

How to prevent buttons from submitting forms In the following page, with Firefox the remove button submits the form, but the add button doesn't. How do I prevent the remove button from submitting the form? Title: Add Item Remove Last Item Name You're using an HTML5 button element. Remember the reason is this button has a default behavior of submit, as stated in the W3 specification as seen here:..

How to check a radio button with jQuery? I try to check a radio button with jQuery. Here's my code: And the JavaScript: jQuery("#radio_1").attr('checked', true); Doesn't work: jQuery("input[value='1']").attr('checked', true); Doesn't work: jQuery('input:radio[name="type"]').filter('[value="1"]').attr('checked', true); Doesn't work: Do you have another idea? What am I missing? For versions of jQu..

Save PL/pgSQL output from PostgreSQL to a CSV file What is the easiest way to save PL/pgSQL output from a PostgreSQL database to a CSV file? I'm using PostgreSQL 8.4 with pgAdmin III and PSQL plugin where I run queries from. Do you want the resulting file on the server, or on the client? Server side If you want something easy to re-use or automate, you can use Postgresql's built in COPY command...

Xcode 7 error: “Missing iOS Distribution signing identity for …” I tried to upload my App to iTunes Connect resp. AppStore and got the following error: Failed to locate or generate matching signing assets Xcode attempted to locate or generate matching signing assets and failed to do so because of the following issues. Missing iOS Distribution signing identity for ... Xcode can request one for yo..

What's your favorite “programmer” cartoon? Personally I like this one: P.S. Do not hotlink the cartoon without the site's permission please. Another one from xkcd ​​​​ I like this one: http://xkcd.com/149/ (Proper User Policy apparently means Simon Says.) I wrote a production website that has the path /dev/random/ return 4 because of this comic. XKCD Comic 303 - "Compiling" ('Are you stealing th..

How do I find the location of my Python site-packages directory? How do I find the location of my site-packages directory? There are two types of site-packages directories, global and per user. Global site-packages ("dist-packages") directories are listed in sys.path when you run: python -m site For a more concise list run getsitepackages from the site module in Python code: python -c "import si..

How do I run two commands in one line in Windows CMD? I want to run two commands in a Windows CMD console. In Linux I would do it like this touch thisfile ; ls -lstrh How is it done on Windows? Like this on all Microsoft OSes since 2000, and still good today: dir & echo foo If you want the second command to execute only if the first exited successfully: dir && echo foo The single ampersand (&) s..

What is the difference between a framework and a library? [closed] What is the difference between a framework and a library? I always thought of a library as a set of objects and functions that focuses on solving a particular problem or a specific area of application development (i.e. database access); and a framework on the other hand as a collection of libraries centered on a particular method..

2D 어레이에서 피크 감지 나는 개 발 밑에서 압력을 측정하는 동물 병원을 돕고 있습니다. 데이터 분석을 위해 Python을 사용하고 있으며 이제 발을 (해부학적인) 하위 영역으로 나누려고 노력하고 있습니다. 저는 시간이 지남에 따라 발에 의해로드 된 각 센서의 최대 값으로 구성된 각 발의 2D 배열을 만들었습니다. 다음은 Excel을 사용하여 '감지'하려는 영역을 그리는 한 발의 예입니다. 이들은 함께 가장 큰 합계를 갖는 로컬 최대 값을 갖는 센서 주변의 2x2 상자입니다. 그래서 나는 약간의 실험을 시도하고 각 열과 행의 최대 값을 찾기로 결정했습니다 (발 모양 때문에 한 방향으로 볼 수 없음). 이것은 개별 발가락의 위치를 ​​상당히 잘 감지하는 것처럼 보이지만 인접한 센서도 표시합니다. 그렇다면..