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1 What's better at freeing memory with PHP: unset() or $var = null
2009年02月25 - the net that use $var = null instead. 我意识到第二种方法避免了函数调用的开销(更新,实际上是一种语言构造),但是如果知道一个比另一个好,那就很有趣了。在我的大部分代码中,我一直在使用unset(),但是最近我通过一些值得尊敬的类找到了使用$var = null的网络
2 shell: What is the purpose of ${var:-} when var is unset or null?
2016年08月12 - } If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is substituted. 如果参数未设置或为null,则替换单词的扩展。否则,参数的值将被替换
3 php - what's the benefit of unsetting variables? [duplicate]
2011年02月17 - Possible Duplicates: What's better at freeing memory with PHP: unset() or $var = null 可能的重复:使用PHP: unset()或$var = null释放内存更好的方法是什么
4 What's the difference between is_null($var) and ($var === null)?
2011年01月11 - Is there any difference between this... 这两者之间有什么区别吗? if (is_null($var)) { do_something(); } and this? 这吗? if ($var === null
5 what's better php, JSP or others
2012年05月10 - Tell me what has greater performance and is better overall: 告诉我什么有更好的表现和更好的整体: php JSP or any other technologies? php JSP或其他技术? Which is faster
6 What's better: Json or XML (PHP)
2009年07月12 - I'm manipulating few data with PHP, I have the choice between Json and XML. But I don't know what to choose, I never worked with one of them. So I
8 Allocating memory and freeing them. Should we set them to NULL?
2012年09月19 - ,我仍然得到相同的内存地址,在分配内存之前,它不应该是NULL吗? After freeing the memory: 释放内存之后: (gdb) p db_row $28 = (struct address *) 0x602310 (gdb) p *db_row $27 = {id = 6300480
9 Anyone ever used PHP's (unset) casting?
2011年08月16 - I just noticed PHP has an type casting to (unset), and I'm wondering what it could possibly be used for. It doesn't even really unset the variable
10 In PHP, what's the diff : $var2=$var1 ; $var2=&$var1; [duplicate]
2010年08月21 - Possible Duplicate: Reference assignment operator in php =& 可能的副本:php =&的引用赋值操作符。 $var2 = $var1; $var2 = &$var1; Example: 例子

 
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