Laravel2
hello.php
<?php echo "Hello world!"; ?>
$ php hello.php Hello world!
Interactive shell
$ php -a
Interactive shell
php > $dog = ["shibainu", "poodle", "chiwawa", "golden retriever"];
php > echo $dog[3];
golden retriever
php > var_dump($dog);
array(4) {
[0]=>
string(8) "shibainu"
[1]=>
string(6) "poodle"
[2]=>
string(7) "chiwawa"
[3]=>
string(16) "golden retriever"
}
php > $human = array("height"=>180, "weight"=>70, "name"=>"tanaka");
php > echo $human["height"];
180
php > echo $human["weight"];
70
php > echo $human["name"];
tanaka
php Server
$ pwd /Users/xxxxx/laravel-projects/php $ php -S 127.0.0.1:8000 PHP 7.3.9 Development Server started at Sat Sep 28 20:14:29 2019 Listening on http://127.0.0.1:8000 Document root is /Users/xxxxx/laravel-projects/php Press Ctrl-C to quit.
http://localhost:8000/hello.php Hello world!
for , if
forloop.php
<?php
for ($i=0; $i <= 100; $i++) {
if ($i % 2 == 0) {
echo $i.",";
}
}
?>
$ php forloop.php 0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98,100,
Laravel
Installing Laravel
$ brew install php@7.3
$ php -v
PHP 7.3.9 (cli) (built: Sep 14 2019 18:07:55) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.3.9, Copyright (c) 1998-2018 Zend Technologies
with Zend OPcache v7.3.9, Copyright (c) 1999-2018, by Zend Technologies
Installing Composer
$ php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
$ ls com*
composer-setup.php
$ php -r "if (hash_file('sha384', 'composer-setup.php') === 'a5c698ffe4b8e849a443b120cd5ba38043260d5c4023dbf93e1558871f1f07f58274fc6f4c93bcfd858c6bd0775cd8d1') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
Installer verified
$ php composer-setup.php
$ php -r "unlink('composer-setup.php');"
$ ls com*
composer.phar
$ mv composer.phar /usr/local/bin/composer
$ ls /usr/local/bin/composer
/usr/local/bin/composer
Installing Laravel
$ composer global require laravel/installer $ nano .bash_profile # Laravel export PATH="$HOME/.composer/vendor/bin:$PATH" $ source .bash_profile $ ls -la .composer/vendor/bin/ laravel -> ../laravel/installer/laravel
Laravel Projects
$ mkdir laravel-projects $ cd laravel-projects $ laravel new blog $ ls -l blog drwxr-xr-x 7 staff 224 9 22 19:41 app -rw-r--r-- 1 staff 1686 9 22 19:41 artisan drwxr-xr-x 4 staff 128 9 22 19:41 bootstrap -rw-r--r-- 1 staff 1501 9 22 19:41 composer.json -rw-r--r-- 1 staff 175965 9 22 19:41 composer.lock drwxr-xr-x 15 staff 480 9 22 19:41 config drwxr-xr-x 6 staff 192 9 22 19:41 database -rw-r--r-- 1 staff 1013 9 22 19:41 package.json -rw-r--r-- 1 staff 1156 9 22 19:41 phpunit.xml drwxr-xr-x 6 staff 192 9 22 19:41 public drwxr-xr-x 6 staff 192 9 22 19:41 resources drwxr-xr-x 6 staff 192 9 22 19:41 routes -rw-r--r-- 1 staff 563 9 22 19:41 server.php drwxr-xr-x 5 staff 160 9 22 19:41 storage drwxr-xr-x 6 staff 192 9 22 19:41 tests drwxr-xr-x 42 staff 1344 9 22 19:42 vendor -rw-r--r-- 1 staff 538 9 22 19:41 webpack.mix.js -rw-r--r-- 1 staff 209001 9 22 19:41 yarn.lock
Golang10
switch
package main
import (
"fmt"
"strconv"
)
const (
Rice = iota
Onigiri
Lunch
Sushi
Curry
)
func FoodSelect(food int) string {
switch food {
case Rice:
return "🍚"
case Onigiri:
return "🍙"
case Lunch:
return "🍱"
case Sushi:
return "🍣"
case Curry:
return "🍛"
default:
return "?"
}
}
func main() {
var choice string
fmt.Print("Enter food (0: Rice, 1: Onigiri, 2: Lunch, 3: Sushi, 4: Curry) : ")
fmt.Scan(&choice)
var input int
input, _ = strconv.Atoi(choice)
fmt.Println(FoodSelect(input))
}
$ go run main.go Enter food (0: Rice, 1: Onigiri, 2: Lunch, 3: Sushi, 4: Curry) : 3 🍣 $ go run main.go Enter food (0: Rice, 1: Onigiri, 2: Lunch, 3: Sushi, 4: Curry) : 4 🍛 $ go run main.go Enter food (0: Rice, 1: Onigiri, 2: Lunch, 3: Sushi, 4: Curry) : 5 ?
Raspberry Pi
Raspberry Piの無線LANのアクセスポイント構築
$ sudo apt-get install hostapd dnsmasq
$ nano /etc/dhcpcd.conf interface wlan1 static ip_address=192.168.100.1/24 static routers=192.168.100.1 static domain_name_servers=192.168.100.1
$ sudo nano /etc/hostapd/hostapd.conf interface=wlan1 driver=nl80211 ssid=[YOUR_SSID] hw_mode=g channel=6 wmm_enabled=0 macaddr_acl=0 auth_algs=1 wpa=2 wpa_key_mgmt=WPA-PSK rsn_pairwise=CCMP wpa_passphrase=[YOUR_PASSWORD]
$ sudo nano /etc/default/hostapd DAEMON_CONF="/etc/hostapd/hostapd.conf"
$ sudo nano /etc/dnsmasq.conf interface=wlan1 dhcp-range=192.168.100.2,192.168.100.40,255.255.255.0,24h
$ sudo nano /etc/sysctl.conf net.ipv4.ip_forward=1
$ sudo iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE $ sudo iptables -A FORWARD -i wlan0 -o wlan1 -m state --state RELATED,ESTABLISHED -j ACCEPT $ sudo iptables -A FORWARD -i wlan1 -o wlan0 -j ACCEPT $ sudo iptables-save | sudo tee /etc/iptables.ipv4.nat
$ sudo systemctl start dnsmasq $ sudo systemctl start hostapd Failed to start hostapd.service: Unit hostapd.service is masked.
$ sudo systemctl unmask hostapd $ sudo systemctl enable hostapd $ sudo systemctl start hostapd
$ sudo update-rc.d hostapd enable
Golang9
アンダースコア変数「 _ 」
(1) for _, n := range
package main
import (
"fmt"
)
func main() {
numbers := []int{20, 30, 40}
// index
for n := range numbers {
fmt.Println(n)
}
// index, value
for _, n := range numbers {
fmt.Println(n)
}
}
$ go run main.go 0 1 2 20 30 40
(2) _, err
package main
import (
"log"
"os"
)
func main() {
_, err := os.Open("filename.ext")
if err != nil {
log.Fatal(err)
}
}
$ go run main.go 2019/09/21 13:55:04 open filename.ext: no such file or directory exit status 1
Golang8
文字列型
/var/main.go
package main
import (
"fmt"
"strings"
)
func main() {
fmt.Println("Hello World")
fmt.Println("Hello " + "World")
fmt.Println("Hello World"[0])
fmt.Println(string("Hello World"[0]))
var s string = "Hello World"
s = strings.Replace(s, "o", "a", 1)
fmt.Println(s)
fmt.Println(strings.Contains(s, "World"))
fmt.Println("\"")
fmt.Println(`"`)
}
$ go run main.go Hello World Hello World 72 H Hella World true " "
論理値型
package main
import "fmt"
func main() {
t, f := true, false
fmt.Printf("%T %t\n", t, t)
fmt.Printf("%T %t\n", f, f)
fmt.Println("&&")
fmt.Println(true && true)
fmt.Println(true && false)
fmt.Println(false && false)
fmt.Println("||")
fmt.Println(true || true)
fmt.Println(true || false)
fmt.Println(false || false)
fmt.Println("!")
fmt.Println(!true)
fmt.Println(!false)
}
go run main.go bool true bool false && true false false || true true false ! false true
Golang7
数値型：
「整数型」
uint8 unsigned 8-bit integers (0 to 255) uint16 unsigned 16-bit integers (0 to 65535) uint32 unsigned 32-bit integers (0 to 4294967295) uint64 unsigned 64-bit integers (0 to 18446744073709551615) int8 signed 8-bit integers (-128 to 127) int16 signed 16-bit integers (-32768 to 32767) int32 signed 32-bit integers (-2147483648 to 2147483647) int64 signed 64-bit integers (-9223372036854775808 to 9223372036854775807)
「浮動小数点型」
float32 IEEE-754 32-bit floating-point numbers float64 IEEE-754 64-bit floating-point numbers
「複素数型」
complex64 complex numbers with float32 real and imaginary parts complex128 complex numbers with float64 real and imaginary parts
/var/main.go
package main
import "fmt"
func main() {
var (
u8 uint8 = 255
i8 int8 = 127
f32 float32 = 0.2
c64 complex64 = -5 + 12i
)
fmt.Println(u8, i8, f32, c64)
fmt.Printf("type=%T value=%v\n", u8, u8)
}
$ go run main.go 255 127 0.2 (-5+12i) type=uint8 value=255
インクリメント
package main
import "fmt"
func main() {
x := 0
fmt.Println(x)
x++
fmt.Println(x)
x--
fmt.Println(x)
}
$ go run main.go 0 1 0
2進数
package main
import "fmt"
func main() {
fmt.Println(1 << 0)
fmt.Println(1 << 1)
fmt.Println(1 << 2)
fmt.Println(1 << 3)
}
$ go run main.go 1 2 4 8
