大约有 42,000 项符合查询结果（耗时：0.0587秒） [XML]
Timeout jQuery effects
...
|
edited Aug 1 '13 at 13:18
Mchl
56.6k99 gold badges102102 silver badges113113 bronze badges
an...
Android Writing Logs to text File
...
outkkastoutkkast
3,09811 gold badge1515 silver badges66 bronze badges
...
isset() and empty() - what to use
...as been set to NULL
Your code would be fine as:
<?php
$var = '23';
if (!empty($var)){
echo 'not empty';
}else{
echo 'is not set or empty';
}
?>
For example:
$var = "";
if(empty($var)) // true because "" is considered empty
{...}
if(isset($var)) //tru...
Delete fork dependency of a GitHub repository
...
answered Apr 17 '13 at 6:13
Thomas MoulardThomas Moulard
3,54122 gold badges1616 silver badges2626 bronze badges
...
Rails 4: List of available datatypes
...SchemaStatements.html#method-i-add_column
These are the same as with Rails 3.
If you use PostgreSQL, you can also take advantage of these:
:hstore
:json
:jsonb
:array
:cidr_address
:ip_address
:mac_address
They are stored as strings if you run your app with a not-PostgreSQL database.
Edit, 201...
How to set the current working directory? [duplicate]
...
|
edited Feb 13 '13 at 10:43
Alex L
7,35444 gold badges4040 silver badges6969 bronze badges
...
Where are my postgres *.conf files?
I have recently reinstalled postgresql 8.3 on my Ubuntu 8.04 after update. Used EnterpriseDB package. I can connect to the database locally, I see system DB postgres but I can't configure it because I can't find config files. Searched through entire hard drive and found only samples like pg_hba.con...
Font size in CSS - % or em?
...
Glenn SlavenGlenn Slaven
31.3k2424 gold badges105105 silver badges161161 bronze badges
...
Django, creating a custom 500/404 error page
...
answered Jul 13 '14 at 16:56
Aaron LelevierAaron Lelevier
15.1k99 gold badges5858 silver badges9797 bronze badges
...