開発スタッフがアプリ関連の最新技術やニュースをご紹介します。

Today I will talk about how to operate Json data in PHP especially using json_encode & json_decode.

So, Lets get started. We have an array like this.

<?php
$months = array("Jan"=>"01","Feb"=>"02","March"=>"03","April"=>"04");
?>

If we want to change that array to json format, we can do like this.

<?php
$months = array("Jan"=>"01","Feb"=>"02","March"=>"03","April"=>"04");

echo json_encode($months);
?>

So What about decoding, decoding the also similar with encoding.

<?php
$json = '{"Jan":"01","Feb":"02","March":"03","April":"04"}';

//we can treat the decoded data in two ways (object & array)
//treating like an object.
$obj = json_decode($json);
echo $obj->Jan;

// treating like an array
$array = json_decode($json,true);
echo $array['Jan'];
?>

The sample concept if you want to loop through the decoded json.

<?php
$json = '{"Jan":"01","Feb":"02","March":"03","April":"04"}';

$array = json_decode($jsonobj, true);

foreach($array as $key => $value) {
  echo $key . " => " . $value . "<br>";
}

<?php
$json = '{"Jan":"01","Feb":"02","March":"03","April":"04"}';

$obj = json_decode($jsonobj);

foreach($obj as $key => $value) {
  echo $key . " => " . $value . "<br>";
}

By Yuuma

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今回はLaravelの「シーダー」(Seeder)機能を使用して初期データの投入をおこなう方法を紹介します。

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I will talk about file operations in PHP( handling , read, write etc.). Lets take a look at reading file first.

As an example we have a file called test.txt and if we want to read the contents within the file, can simply do like this.

<?php
echo readfile("test.txt");
//this will out put the contents within the file
?>

But what if we want to handle more than reading a file, we can use fopen

<?php

//we have to open the file first along with the operation mode.
//(r,w,a,x) etc. you can see more detail as below. 
// https://www.php.net/manual/en/function.fopen.php
$file = fopen("test.txt", "r") or die("Unable to open file!");
//then we read the file by specifying maximum number of bytes to read
echo fread($file,filesize("test.txt"));
// then simply close the file.
fclose($file);
?>

We can also get the first line in file using fgets

<?php
$file = fopen("test.txt", "r") or die("Unable to open file!");
echo fgets($file);
fclose($file);
?>

We can also use feof to check whether the file reaches to the end.

<?php
$file = fopen("test.txt", "r") or die("Unable to open file!");
// Output until end-of-file
while(!feof($file)) {
  echo fgets($file) . "<br>";
}
fclose($file);
?>

If we want to check whether file exists or not , we can do like this

<?php
echo file_exists("test.txt");
//if exists, it will return 1
?>

By Yuuma.

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I will talk about static methods usages in php with some code samples. Lets get started.

Here is a sample, calling static function outside of the class.

<?php
class welcome {
  public static function sayHi() {
    echo "Welcome!";
  }
}

// we can like this -> className::methodName()
welcome::sayHi();
?>

We can also call within the class like this using self::

<?php
class welcome {
	public static function sayHi() {
		echo "Welcome!";
	}
	public function msg() {
		self::sayHi();
	}
}

$hi = new welcome();
$hi->msg();
?>

You can also call static methods from another class like this

<?php
class welcome {
  public static function sayHi() {
    echo "Welcome!";
  }
}

class anotherClass {
  public function msg() {
    welcome::sayHi();
  }
}

$var = new anotherClass();
$var->msg();
?>

You can choose any ways depending upon the situations, the result will still be the same.

By Yuuma

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単一のLaravelプロジェクトにおいてURLのパス指定により、データベースの接続先やsessionを切り分けたい場合を考えてみます。

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