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Redis消息通知系统的实现 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...技术细节，其中演示代码如果没有特殊说明，使用的都是PhpRedis扩展来实现的。内...最近忙着用Redis实现一个消息通知系统，今天大概总结了一下技术细节，其中演示代码如果没有特殊说明，使用的都是PhpRedis扩展来实现的。
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PHP: How to use array_filter() to filter array keys?
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PHP 5.6 introduced a third parameter to array_filter(), flag, that you can set to ARRAY_FILTER_USE_KEY to filter by key instead of value:
$my_array = ['foo' => 1, 'hello' => 'world'];
$allowed = ['foo', 'bar'];
$filte...
Passing an array to a query using a WHERE clause
Given an array of ids $galleries = array(1,2,5) I want to have a SQL query that uses the values of the array in its WHERE clause like:
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Error in strings.xml file in Android
... This can cause a problem when you have a lot of strings and use replace all. See my answer.
– Dan Bray
Oct 23 '18 at 14:08
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Formatting a number with leading zeros in PHP [duplicate]
... from the page linked above, here's a sample "zero-padded integers":
<?php
$isodate = sprintf("%04d-%02d-%02d", $year, $month, $day);
?>
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round() for float in C++
... but there are others such as round-to-even, which is less biased and generally better if you're going to do a lot of rounding; it's a bit more complex to implement though.
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Fast way to get image dimensions (not filesize)
...r if it reads the whole data for that though. See the manpage of exiv2 for all supported image formats.
head -n1 will give you the dimensions for PPM, PGM formats.
For formats popular on the web, both exiv2 and identify will do the job.
Depending on the use-case you may need to write your own scri...
PHP cURL vs file_get_contents
... @velop: Yes. And method, too. And redirects. And timeout... php.net/manual/en/context.http.php
– Sz.
Mar 28 '18 at 19:54
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In PHP, how do you change the key of an array element?
...the array, which you may need to be careful of. Even associative arrays in PHP are ordered, and sometimes that order is leveraged.
– Robin Winslow
Feb 9 '12 at 17:14
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How can I change a file's encoding with vim?
...r just to do encoding conversion seems like using too big hammer for too small nail.
Just:
iconv -f utf-16 -t utf-8 file.xml > file.utf8.xml
And you're done.
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