大约有 40,000 项符合查询结果（耗时：0.0276秒） [XML]
PHP Sort Array By SubArray Value
...parison functions just require a return of 1, 0, or -1 indicating the sort order for two elements.
– Tesserex
Mar 19 '10 at 13:19
1
...
Getting the name of a child class in the parent class (static context)
...
in short. this is not possible. in php4 you could implement a terrible hack (examine the debug_backtrace()) but that method does not work in PHP5. references:
30423
37684
34421
edit: an example of late static binding in PHP 5.3 (mentioned in comments). no...
If isset $_POST
....
empty space is considered as set. You need to use empty() for checking all null options.
share
|
improve this answer
|
follow
|
...
Python append() vs. + operator on lists, why do these give different results?
...st. Specifically, it appends each of the elements of sequence in iteration order.
An aside
Being an operator, + returns the result of the expression as a new value. Being a non-chaining mutator method, list.extend() modifies the subject list in-place and returns nothing.
Arrays
I've added this due t...
Best way to select random rows PostgreSQL
... select * from table where random() < 0.01;
EXPLAIN select * from table order by random() limit 1000;
A quick test on a large table1 shows, that the ORDER BY first sorts the complete table and then picks the first 1000 items. Sorting a large table not only reads that table but also involves rea...
Set cURL to use local virtual hosts
...nd. The default config file is checked for in the following places in this order:
1) curl tries to find the "home dir": It first checks for the CURL_HOME and then the HOME environment variables. Failing that, it uses getpwuid() on UNIX-like systems (which returns the home dir
given ...
How to send multiple data fields via Ajax? [closed]
...ing AJAX, but I can't find a way to send multiple data fields via my AJAX call.
12 Answers
...
How can I get useful error messages in PHP?
...ple syntax error (wrong bracket, missing semicolon), or a failed function call, or something else entirely.
43 Answers
...
Accurate way to measure execution times of php scripts
I want to know how many milliseconds a PHP for-loop takes to execute.
14 Answers
14
...
PHP session lost after redirect
...
First, carry out these usual checks:
Make sure session_start(); is called before any sessions are being called. So a safe bet would be to put it at the beginning of your page, immediately after the opening <?php declaration before anything else. Also ensure there are no whitespaces/tabs be...