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What does new self(); mean in PHP?
...getInstance();
var_dump($a);
Here, you'll get :
object(MyChildClass)#1 (0) { }
Which means self means MyChildClass -- i.e. the class in which it is written.
For the second situation, the code would look like this :
class MyParentClass {
public static function getInstance() {
ret...
How to assign colors to categorical variables in ggplot2 that have stable mapping?
...al colour scale as follows:
#Some test data
dat <- data.frame(x=runif(10),y=runif(10),
grp = rep(LETTERS[1:5],each = 2),stringsAsFactors = TRUE)
#Create a custom color scale
library(RColorBrewer)
myColors <- brewer.pal(5,"Set1")
names(myColors) <- levels(dat$grp)
colScale <- sc...
How do I capture bash output to the Mac OS X clipboard?
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edited Jan 10 '10 at 2:09
answered Nov 18 '09 at 1:50
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Java: possible to line break in a properties file?
...ot asked for.
– Enrice
Feb 26 at 15:05
add a comment
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change html text from link with jquery
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered May 23 '09 at 17:06
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Pass Nothing from Javascript to VBScript in IE9
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edited Feb 16 '12 at 16:50
answered Feb 16 '12 at 16:37
Pa...
Adding command line options to CMake
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edited Sep 10 '18 at 21:14
Peter Mortensen
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Question mark (?) in XML attributes for Android
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edited Aug 31 '12 at 10:16
ubershmekel
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answe...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...可以双向传输数据。
注意：
在 UNIX 系统上，系统保留 1023（含）以下的端口号。这些限制已保留用于 LINUX，因此也用于 Android。使用这些端口号需要 root 授权。这同样适用于 Apple 的 iOS。
因此，此扩展无法使用低于 1024 的端口...
How do I add more members to my ENUM-type column in MySQL?
...
140
ALTER TABLE
`table_name`
MODIFY COLUMN
`column_name2` enum(
'existing_value1',
...