Add Network funcs

Author: Syyong

README.md

@@ -167,6 +167,16 @@ system()
 passthru()
 ```
 
+### Network Functions
+```php
+gethostname()
+gethostbyname()
+gethostbynamel()
+gethostbyaddr()
+ip2long()
+long2ip()
+```
+
 ### Other Functions
 ```php
 echo()

php2go.go

@@ -30,6 +30,8 @@ import (
 	"reflect"
 	"os/exec"
 	"regexp"
+	"net"
+	"encoding/binary"
 )
 
 //////////// Date/Time Functions ////////////
@@ -1649,6 +1651,74 @@ func Passthru(command string, returnVar *int) {
 	}
 }
 
+//////////// Network Functions ////////////
+
+// gethostname()
+func Gethostname() (string, error) {
+	return os.Hostname()
+}
+
+// gethostbyname()
+// Get the IPv4 address corresponding to a given Internet host name
+func Gethostbyname(hostname string) (string, error) {
+	ips, err := net.LookupIP(hostname)
+	if ips != nil {
+		for _, v := range ips {
+			if v.To4() != nil {
+				return v.String(), nil
+			}
+		}
+		return "", nil
+	}
+	return "", err
+}
+
+// gethostbynamel()
+// Get a list of IPv4 addresses corresponding to a given Internet host name
+func Gethostbynamel(hostname string) ([]string, error) {
+	ips, err := net.LookupIP(hostname)
+	if ips != nil {
+		var ipstrs []string
+		for _, v := range ips {
+			if v.To4() != nil {
+				ipstrs = append(ipstrs, v.String())
+			}
+		}
+		return ipstrs, nil
+	}
+	return nil, err
+}
+
+// gethostbyaddr()
+// Get the Internet host name corresponding to a given IP address
+func Gethostbyaddr(ipAddress string) (string, error) {
+	names, err := net.LookupAddr(ipAddress)
+	if names != nil {
+		return strings.TrimRight(names[0], "."), nil
+	}
+	return "", err
+}
+
+// ip2long()
+// IPv4
+func Ip2long(ipAddress string) uint32 {
+	ip := net.ParseIP(ipAddress)
+	if ip == nil {
+		return 0
+	}
+	ip = ip.To4()
+	return binary.BigEndian.Uint32(ip)
+}
+
+// long2ip()
+// IPv4
+func Long2ip(properAddress uint32) string {
+	ipByte := make([]byte, 4)
+	binary.BigEndian.PutUint32(ipByte, properAddress)
+	ip := net.IP(ipByte)
+	return ip.String()
+}
+
 //////////// Other Functions ////////////
 
 // echo

php2go_test.go

@@ -310,6 +310,26 @@ func TestProgramExecution(t *testing.T) {
 	equal(t, 0, retVal)
 }
 
+func TestNetwork(t *testing.T) {
+	tGethostname, _ := Gethostname()
+	gt(t, float64(len(tGethostname)), 0)
+
+	tIp2long := Ip2long("8.8.8.8")
+	equal(t, uint32(134744072), tIp2long)
+
+	tLong2ip := Long2ip(134744072)
+	equal(t, "8.8.8.8", tLong2ip)
+
+	tGethostbyname, _ := Gethostbyname("localhost")
+	equal(t, "127.0.0.1", tGethostbyname)
+
+	tGethostbynamel, _ := Gethostbynamel("localhost")
+	gt(t, float64(len(tGethostbynamel)), 0)
+
+	tGethostbyaddr, _ := Gethostbyaddr("127.0.0.1")
+	equal(t, "localhost", tGethostbyaddr)
+}
+
 func TestOther(t *testing.T) {
 	tVersionCompare := VersionCompare("1.3-beta", "1.4Rc1", "<")
 	equal(t, true, tVersionCompare)