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Android应用内存泄露分析、改善经验总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...可以梳理总结出来作为分享。
原则
  对于性能问题，分析和改善有必要遵循以下原则：
一切看数据说话，不能跟着感觉走，感觉哪有问题就去改，很有可能会适得其反；
性能优化是一个持续的过程，需要不断...
Are PHP Variables passed by value or by reference?
... function is changed, it does not get changed outside of the function). To allow a function to modify its arguments, they must be passed by reference.
To have an argument to a function always passed by reference, prepend an ampersand (&) to the argument name in the function definition.
&l...
Why use sprintf function in PHP?
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sprintf has all the formatting capabilities of the original printf which means you can do much more than just inserting variable values in strings.
For instance, specify number format (hex, decimal, octal), number of decimals, padding a...
nginx showing blank PHP pages
...ginx that's shipped with Centos). I'd love to see the documentation around all of this improve.
– Jorre
Mar 27 '14 at 16:23
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PHP Function Comments
Just a quick question: I've seen that some PHP functions are commented at the top, using a format that is unknown to me:
4 ...
php stdClass to array
...aster than iterating through the objects recursively - most likely because PHP is slow at calling functions). "But I already did this" you say. Not exactly - you used json_decode on the array, but you need to encode it with json_encode first.
Requirements
The json_encode and json_decode methods. T...
Make var_dump look pretty
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I really love var_export(). If you like copy/paste-able code, try:
echo '<pre>' . var_export($data, true) . '</pre>';
Or even something like this for color syntax highlighting:
highlight_string("<?php\n\$data ...
How to check that an object is empty in PHP?
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empty doesn't actually check if an array is empty, empty($var) equivalent to (!isset($var) || !$var). You can replace your empty($arr)s with !$arr since array() == FALSE
– Timothy Zorn
Aug 20 '15 at 18:35...
If isset $_POST
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empty space is considered as set. You need to use empty() for checking all null options.
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Getting the name of a child class in the parent class (static context)
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in short. this is not possible. in php4 you could implement a terrible hack (examine the debug_backtrace()) but that method does not work in PHP5. references:
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edit: an example of late static binding in PHP 5.3 (mentioned in comments). no...