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How can I run a PHP script in the background after a form is submitted?
... in the background by using proc_open:
$descriptorspec = array(
array('pipe', 'r'), // stdin
array('file', 'myfile.txt', 'a'), // stdout
array('pipe', 'w'), // stderr
);
$proc = proc_open('php email_script.php &', $descriptorspec, $pipes);
The & being...
HAproxy - Web负载均衡解决方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...没有负载平衡。如果您的单个Web服务器出现故障，用户将无法再访问您的Web服务器。此外，如果许多用户试图同时访问您的服务器并且无法处理负载，他们可能会遇到缓慢的体验，或者可能根本无法连接。
（2）4层负载平衡：
...
How do I get a div to float to the bottom of its container?
... zero width strut element above the float right, then sizing the strut (or pipe) according to parent height minus floated child's height.
Before js kicks in I am using the position absolute approach, which works but allows text flow behind. Therefore I switch to position static to enable the strut...
String concatenation in MySQL
...n enable string concatenation with the || operator in MySQL by setting the PIPES_AS_CONCAT SQL mode.
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count number of lines in terminal output
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Pipe the result to wc using the -l (line count) switch:
grep -Rl "curl" ./ | wc -l
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Create Pandas DataFrame from a string
...tring variable. Especially for use inside a .py file, consider fixed-width pipe-separated data instead. Various IDEs and editors may have a plugin to format pipe-separated text into a neat table.
Using read_csv
Store the following in a utility module, e.g. util/pandas.py. An example is included in t...
How to silence output in a Bash script?
...t;&" means STDERR and STDOUT. the & also works the same way with a pipe: ./script |& sed
that will send everything to sed
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Fastest way to extract frames using ffmpeg?
...eq(n\,800)+eq(n\,1000)' \
-vsync vfr -q:v 2
I'm using this with a pipe to Imagemagick's montage to get 10 frames preview from any videos. Obviously the frame numbers you'll need to figure out using ffprobe
ffmpeg -i myVideo.mov -vf \
select='eq(n\,1)+eq(n\,200)+eq(n\,400)+eq(n\,600)+eq...
Create a tar.xz in one command
...ormat. The output of this operation is generated on the standard output.
| pipes standard output to the input of another program...
... which happens to be xz -z -. XZ is configured to compress (-z) the archive from standard input (-).
You redirect the output from xz to the tar.xz file.
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How to escape indicator characters (i.e. : or - ) in YAML
..., multiline texts, is putting your text indented on the next line, after a pipe or greater-than sign:
text: >
Op dit plein stond het hoofdkantoor van de NIROM: Nederlands Indische
Radio Omroep
A pipe preserves newlines, a gt-sign turns all the following lines into one long string.
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