こちらの記事をたまたま見て気になったので投稿。
PHPでforeachなどを使う時の注意点。ブロックスコープのお話。
確かにループで一時的に必要な変数にスコープが無いと都合が悪いのはその通りなんだけど、解決策にモヤモヤ…
スコープが欲しいところに無いなら作ればいいわけで
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| $fruits = array('banana', 'melon', 'orange'); | |
| function joinFruits($fruits) { | |
| $result = ''; | |
| foreach ($fruits as $fruit) { | |
| $result .= $fruit; | |
| } | |
| return $result; | |
| } | |
| $fruits_str = joinFruits($fruits); | |
| var_dump($fruit); // => undefined variable error | |
| var_dump($fruits_str); // => bananamelonorange |
関数に入れればスコープが作れる。
もっと言えばクラスにすればいいと思う。
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| class Fruits { | |
| var $_data; | |
| public function __construct($data) { | |
| $this->_data = $data; | |
| } | |
| public function join() { | |
| $result = ''; | |
| foreach ($this->_data as $datum) { | |
| $result .= $datum; | |
| } | |
| return $result; | |
| } | |
| } | |
| $fruits = new Fruits(array('banana', 'melon', 'orange')); | |
| var_dump($fruits->join()); // => bananamelonorange |
