sword-jin

echo Carbon::now()->addDays(4); //2015-09-04 20:39:45
echo Carbon::now()->addWeeks(4); //2015-09-28 20:39:56
echo Carbon::now()->subWeeks(4); //2015-09-28 20:39:56
echo Carbon::now()->tomorrow(); //2015-09-01 00:00:00
echo Carbon::now()->yesterday(); //2015-08-30 00:00:00

$time = Carbon::now()->subYears(1)->timestamp;
echo $time; //1409488994

$date = Carbon::createFromTimestamp($time);

sword-jin

<?php namespace App\Exceptions;

use Exception;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;
use Symfony\Component\Debug\ExceptionHandler as SymfonyDisplayer;

class Handler extend ExceptionHandler
{
    /**
     * Convert the given exception into a Response instance.

sword-jin

<?php

function foobar($arg1, $arg2)
{
    echo __FUNCTION__ . " got $arg1 and $arg2\n";
}

class foo
{
    function bar($arg1, $arg2)

sword-jin

DirectoryIterator

• include dot files
• numbered keys
• Path not included in value
• no configuration options
• array requires cloned objects

FilesystemIterator

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<?php

$courses = simplexml_load_file('common/data/courses.xml', 'SimpleXMLIterator');

$courses = new CallbackFilterIterator($courses, 'getCoursesByLevel');

foreach ($courses as $course) {
    echo "$course->title with $course->author (level: $course->level)<br />";
}

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<?php

class AuthorFilter extends FilterIterator
{
    /**
     * @var Iterator
     */
    private $author;

    public function __construct(Iterator $iterator, $author)

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<?php

$files = new RecursiveDirectoryIterator('common');
$files->setFlags(RecursiveDirectoryIterator::SKIP_DOTS | RecursiveDirectoryIterator::UNIX_PATHS);
$files = new RecursiveTreeIterator($files);
$files->setPrefixPart(RecursiveTreeIterator::PREFIX_LEFT, '&divideontimes;');
$files->setPrefixPart(RecursiveTreeIterator::PREFIX_END_HAS_NEXT, '&Vdash;');
$files->setPrefixPart(RecursiveTreeIterator::PREFIX_END_HAS_NEXT, '&wr;');
$files->setPrefixPart(RecursiveTreeIterator::PREFIX_END_LAST, '&acd;');

sword-jin

通过代码学习和理解双向链表

• rewind 使链表当前节点指向链表的底部
• push 向顶部插入元素
• pop 获取顶部节点，并且删除这个节点，当前指针的位置不改变
• current 指向链表当前节点的指针，必须在调用之前调用 current，指向的节点被删除之后会指向一个空节点。
• next 指针指向下一个节点
• unshife 获取底部节点，并且删除这个节点，当前指针的位置不改变
• bottom 获取底部元素
• top 获取顶部元素

sword-jin

CREATE DATABASE IF NOT EXISTS table_name COLLATE utf8_general_ci;

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

GRANT SELECT, INSERT, UPDATE, DELETE ON table_name.* TO 'username'@'host';

sword-jin

//截取字符串
$substring = substr($string,$start,$length);

//使用给定字符串替换
$new_string = substr_replace($old_string,$new_substring,$start);

//反转字符串
string strrev (string $string)

//反转字符串(单词)