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C++STL容器使用经验总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...是为了避免不必要的拷贝。使拷贝动作高效并且防止剥离问题发生的一个简单办法是使容器包含指针而不是对象。
第4条：调用empty而不是检查size()是否为0。
理由很简单：empty对所有的标准容器都是常数时间操作，而对...
getting date format m-d-Y H:i:s.u from milliseconds
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php.net says:
Microseconds (added in PHP 5.2.2). Note that date() will always generate 000000 since it takes an integer parameter, whereas DateTime::format() does support microseconds if DateTime was created with microsec...
How can I set the PHP version in PHPStorm?
Is it possible to set the PHP version value, say 4.0+ and have PHPStorm highlight functions that wouldn't work with the oldest version? For example, for PHP4 this should highlight static function etc. I have a PHP installation on my PC but I don't want to install an older PHP version for every sma...
How do I catch a PHP fatal (`E_ERROR`) error?
I can use set_error_handler() to catch most PHP errors, but it doesn't work for fatal ( E_ERROR ) errors, such as calling a function that doesn't exist. Is there another way to catch these errors?
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Coalesce function for PHP?
...es have a coalesce function (returns the first non-NULL value, example ). PHP, sadly in 2009, does not.
9 Answers
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Getting the first character of a string with $str[0]
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Does PHP $str[0] take into account that there can be 2Byte long chars? UTF and such? (even though substr() does not help with it either!)
– Tomer W
Jun 26 '13 at 13:29
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PHP append one array to another (not array_push or +)
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Another way to do this in PHP 5.6+ would be to use the ... token
$a = array('a', 'b');
$b = array('c', 'd');
array_push($a, ...$b);
// $a is now equals to array('a','b','c','d');
This will also work with any Traversable
$a = array('a', 'b');
$b ...
Why a function checking if a string is empty always returns true? [closed]
... '' will return true if you pass is numeric 0 and a few other cases due to PHP's automatic type conversion.
You should not use the built-in empty() function for this; see comments and the PHP type comparison tables.
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PHP 5: const vs static
In PHP 5, what is the difference between using const and static ?
7 Answers
7
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Generating a random password in php
I am trying to generate a random password in php.
22 Answers
22
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