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How to test which port MySQL is running on and whether it can be connected to?
...MySQL is on a certain port, you can use the following command in terminal. Tested on mac. 3306 is the default port.
mysql --host=127.0.0.1 --port=3306
If you successfully log in to the MySQL shell terminal, you're good! This is the output that I get on a successful login.
Welcome to the MySQL mon...
How to remove the first character of string in PHP?
...r[0] = null;
// replaced by �, but ok for echo
Exec time for 1.000.000 tests : 0.39602184295654 sec
Remove the first letter with substr()
$str = "hello";
$str = substr($str, 1);
Exec time for 1.000.000 tests : 5.153294801712 sec
Remove the first letter with ltrim()
$str = "hello";
$str...
How to check if a string “StartsWith” another string?
...
WARNING! These jsperf tests don't work in browsers that are good at JIT compiling. Browsers like Firefox and Chrome sometimes recognize it when the result of an operation is discarded, and therefore don't perform the operation. Apart from that, mo...
Check to see if a string is serialized?
...b:0;' || $data !== false) {
echo "ok";
} else {
echo "not ok";
}
testing that special case before trying to unserialize would be an optimization -- but probably not that usefull, if you don't often have a false serialized value.
...
Best way to do multi-row insert in Oracle?
...his isn't a one off, its worth it.
Create Table
SQL> create table ldr_test (id number(10) primary key, description varchar2(20));
Table created.
SQL>
Create CSV
oracle-2% cat ldr_test.csv
1,Apple
2,Orange
3,Pear
oracle-2%
Create Loader Control File
oracle-2% cat ldr_test.ctl
load dat...
Pipe to/from the clipboard in Bash script
... you can't just use to Ctrl+v to paste it back in a different place.
echo test | xclip
Ctrl+v === test
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Why does `a == b or c or d` always evaluate to True?
...= "Inbar":
Compose a sequence of valid values, and use the in operator to test for membership:
if name in {"Kevin", "Jon", "Inbar"}:
In general of the two the second should be preferred as it's easier to read and also faster:
>>> import timeit
>>> timeit.timeit('name == "Kevin" ...
What is the difference between visibility:hidden and display:none?
... page. The tag is rendered, it just isn't seen on the page.
For example:
test | <span style="[style-tag-value]">Appropriate style in this tag</span> | test
Replacing [style-tag-value] with display:none results in:
test | | test
Replacing [style-tag-value] with visibility:hidden ...
What does jQuery.fn mean?
...rom the constructor's prototype.
A simple constructor function:
function Test() {
this.a = 'a';
}
Test.prototype.b = 'b';
var test = new Test();
test.a; // "a", own property
test.b; // "b", inherited property
A simple structure that resembles the architecture of jQuery:
(function() {
var ...
Awk学习笔记 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是由模式和操作组成的：
pattern {action} 如$ awk '/root/' test，或$ awk '$3 < 100' test。
两者是可选的，如果没有模式，则action应用到全部记录，如果没有action，则输出匹配全部记录。默认情况下，每一个输入行都是一条记录...