大约有 23,000 项符合查询结果（耗时：0.1015秒） [XML]
PHP: How to check if image file exists?
...
You need the filename in quotation marks at least (as string):
if (file_exists('http://www.mydomain.com/images/'.$filename)) {
… }
Also, make sure $filename is properly validated. And then, it will only work when allow_url_fopen is activated in your PHP config
...
BigDecimal - to use new or valueOf
...don't do the same thing. BigDecimal.valueOf(double) will use the canonical String representation of the double value passed in to instantiate the BigDecimal object. In other words: The value of the BigDecimal object will be what you see when you do System.out.println(d).
If you use new BigDecimal(d...
What does “Content-type: application/json; charset=utf-8” really mean?
...7 has been obsoleted by RFC7159, which states that the root value may be a string (in explicit contrast to the former spec), how is this now implemented? The spec is vague in this regard, and just says that three encodings are allowed, but not how one is supposed to differentiate them.
...
Sql query to insert datetime in SQL Server
...
A more language-independent choice for string literals is the international standard ISO 8601 format "YYYY-MM-DDThh:mm:ss". I used the SQL query below to test the format, and it does indeed work in all SQL languages in sys.syslanguages:
declare @sql nvarchar(400...
Pass entire form as data in jQuery Ajax function
...'s supported by updated browsers but by using serialized you can only pass strings.
– Moh Arjmandi
Aug 19 '15 at 11:00
4
...
How to obtain a Thread id in Python?
... @CharlesAnderson beware, the python docs on Thread.name say "name - A string used for identification purposes only. It has no semantics. Multiple threads may be given the same name. The initial name is set by the constructor."
– drevicko
Dec 4 '12 at 6:10
...
Getting the exception value in Python
...rror message.
It should be noted that just using str will return an empty string if there's no error message whereas using repr as pyfunc recommends will at least display the class of the exception. My take is that if you're printing it out, it's for an end user that doesn't care what the class is ...
How is a CRC32 checksum calculated?
... For CRC32 or CRC32b , do we get hash collision meaning for two different strings do we get same CRC
– indianwebdevil
May 18 at 2:42
1
...
APT command line interface-like yes/no input?
.../no question via raw_input() and return their answer.
"question" is a string that is presented to the user.
"default" is the presumed answer if the user just hits <Enter>.
It must be "yes" (the default), "no" or None (meaning
an answer is required of the user).
Th...
Select Last Row in the Table
...derBy(id', 'desc')->first(); Order by date works longer because date is string and most likely not indexed. While primary key is indexed and works super fast. Even if created_at indexed, it is indexed string and not INT in case of primary. Index string has less performance.
–...