开发拾遗

2016-05-15 11:24:00

python unicode字符串转成中文

s = 'u6d4bu8bd5u957fu5ea6'
s = s.replace('u', '\u')
print s.decode('unicode-escape')

php 二进制直接量

$bin = bindec('110011');
$bin = 0b110011;

php foreach list

$arr = [
[1, 2],
[3, 4],
];
foreach ($arr as list($a, $b)) {
echo $a.$b\n";
}

PHP ==和隐式转换

var_dump(md5('240610708') == md5('QNKCDZO'));// true 两个字符串恰好以0e 的科学记数法开头，字符串被隐式转换为浮点数，也就等效于0×10^0
var_dump(sha1('aaroZmOk') == sha1('aaK1STfY'));// true
var_dump('0x1234Ab' == '1193131');// true 0x1234Ab转为16进制，php7无此bug
var_dump( 0 == "a" );// true
var_dump( "0" == "a" );// true

== 、switch、in_array 的松比较

// 如果 $name 值为 0，那么它会满足任何一条 case
switch ($name) {// 使用switch (strval($name)) {
case "danny":
break;
case "eve":
break;
}
$needle = '1abc';
$haystack = array(1,2,3);
var_dump(in_array($needle, $haystack);// true

javascript Date对象的浏览器兼容性问题

// chrome同时支持'-'和'/'分割日期的时间字符串；safari不支持'-'分割日期的时间字符串

var arr = "2010-03-15 10:30:00".split(/[- / :]/),
date = new Date(arr[0], arr[1]-1, arr[2], arr[3], arr[4], arr[5]);

javascript 模拟Object.keys()

function keys(obj){
var a = [];
for(a[a.length] in obj);
return a;
}

javascript数组去重

function dedupe(array){
return Array.from(new Set(array));
}

dedupe([1,1,2,3]) //[1,2,3]

工具

// 命令行提示tldr npm install -g tldr

octotree 是一款可为 GitHub 和 GitLab 添加侧边栏文件导航的 Chrome 和 Opera 插件
python下载视频工具

Sublime Text3 汉化

// Package Control：Install Package，输入Chinese，选择ChineseLocalization

javascript reduce

arr = [1,2,3,4,5]
arr.reduce(function(a,b){
return a10+b;
});//12345
var result = [1, 2, 3, 4, 5].reduce(function(prev, curr, index, array){
debugger;
prev.push(curr 2);
return prev;
}, []);
console.log(result);//[2, 4, 6, 8, 10]
//求最大值
var max = arr.reduce(function(pre,cur,inde,arr){return pre>cur?pre:cur;});
var arr = [ {name: 'brick1'}, {name: 'brick2'}, {name: 'brick3'} ]
function carryBricks(arr){
return arr.reduce(function(prev, current, index, array){
if (index === 0){
return current.name;
}
else if (index === array.length - 1){
return prev + ' & ' + current.name;
}
else {
return prev + ', ' + current.name;
}
}, '');
}//brick11, brick12 & brick13
//去重
var arr = [1, 3, 1, 'x', 'zz', 'x', false, false];
var result = arr.reduce(function(prev, curr, i, array) {
var flag = prev.every(function(value) {
return value !== curr;
});
flag && prev.push(curr);
return prev;
}, []);
console.log(result);

jquery插件

输入提示自动完成插件tokeninput
tablesorter 表格排序
Date.js执行日期/时间的计算
图片裁剪
日期选择插件pickadate.js
javascript刻度条插件

0.1+0.2

Math.round( (.1+.2)*100)/100; //0.3

mysql分解联合查询

select * from teacher
join school on teacher.id = school.id
join course on teacher.id = course.id
where course.name= 'english'

分解后
select from course where name = 'english'
select from school where course_id = 1
select * from teacher where school_id in (1,2,3)

字符串中每个字母重复出现的次数

var temp = {};
'abcdaabc'.replace(/(\w{1})/g,function($1){
temp[$1] ? temp[$1]+=1 : temp[$1] = 1;
})
console.log(temp) // {a: 3, b: 2, c: 2, d: 1}

composer

PHP HTTP请求套件
实现 Laravel 模型的无限极分类

php一维数组转多维数组

$arr = ['a', 'b', 'c', 'd'];
$child = array();
$res = [];
while($v = array_pop($arr)) {
$res = [$v => $child];
$child = $res;
}

python中字符串的按位或

a = "1000111000"
b = "1000000001"

c = int(a, 2) | int(b, 2)

print('{0:b}'.format(c))# 1000111001

python生成斐波拉契数列

def fib(max):
n, a, b = 0, 0, 1
while n

php正则匹配

$str="{a:1,b:2,c:3}";
preg_match_all('/(\w+):(\d+)/', $str, $matches);
$arr = array_combine($matches[1], $matches[2]);# ['a'=>1,'b'=>2,'c'=>3]

php max/min

max(ceil(-0.5), 0) # -0.0
max(0, ceil(-0.5)) # 0

NaN

.isNaN = function(obj){
return .isNumber(obj) && obj !==+obj;
};

Mysql 用一张表中的数据更新另一张表的数据

update tableA as ca inner join tableB as cb set ca.thumbs=cb.thumbs where cb.courseid=1;
24.php后期静态绑定

class A {
public static function get_self() {
return new self();
}
public static function get_static() {
return new static();
}
}
class B extends A {}
get_class(B::get_self());//A
get_class(B::get_static()) //B
get_class(A::get_static());//A

json_encode输出动态javascript

$images = array( 'myself.png' , 'friends.png' , 'colleagues.png' );
$js_code = 'var images = ' . json_encode($images);
echo $js_code; // var images = ["myself.png","friends.png","colleagues.png"]