{"componentChunkName":"component---src-templates-blog-post-tsx","path":"/blog/2020-01-06-start-php/","result":{"data":{"site":{"siteMetadata":{"title":"Ouvill のブログ","author":"Ouvill(おーびる)","siteUrl":"https://blog.ouvill.net"}},"defaultCover":{"childImageSharp":{"gatsbyImageData":{"layout":"constrained","backgroundColor":"#d8d8d8","images":{"fallback":{"src":"/static/b1addcc2c923340c2baaa1236d2555d2/2c1fd/site-header.jpg","srcSet":"/static/b1addcc2c923340c2baaa1236d2555d2/78489/site-header.jpg 80w,\n/static/b1addcc2c923340c2baaa1236d2555d2/9d796/site-header.jpg 160w,\n/static/b1addcc2c923340c2baaa1236d2555d2/2c1fd/site-header.jpg 320w,\n/static/b1addcc2c923340c2baaa1236d2555d2/394a8/site-header.jpg 640w","sizes":"(min-width: 320px) 320px, 100vw"},"sources":[{"srcSet":"/static/b1addcc2c923340c2baaa1236d2555d2/fd305/site-header.avif 80w,\n/static/b1addcc2c923340c2baaa1236d2555d2/3675f/site-header.avif 160w,\n/static/b1addcc2c923340c2baaa1236d2555d2/d94f4/site-header.avif 320w,\n/static/b1addcc2c923340c2baaa1236d2555d2/54e23/site-header.avif 640w","type":"image/avif","sizes":"(min-width: 320px) 320px, 100vw"},{"srcSet":"/static/b1addcc2c923340c2baaa1236d2555d2/0e3bd/site-header.webp 80w,\n/static/b1addcc2c923340c2baaa1236d2555d2/f7b29/site-header.webp 160w,\n/static/b1addcc2c923340c2baaa1236d2555d2/09d71/site-header.webp 320w,\n/static/b1addcc2c923340c2baaa1236d2555d2/359e0/site-header.webp 640w","type":"image/webp","sizes":"(min-width: 320px) 320px, 100vw"}]},"width":320,"height":200}},"publicURL":"/static/b1addcc2c923340c2baaa1236d2555d2/site-header.jpg"},"allMarkdownRemark":{"edges":[{"node":{"excerpt":"…","fields":{"slug":"/blog/2024-09-04-2024_programming_language/"},"frontmatter":{"date":"2024/09/04","title":"プログラミング言語雑感(2024年)：C, C++, Java, C#, Python, JavaScript,　Ruby, PHP, Flutter, Rust, Go","description":null,"cover":null}}},{"node":{"excerpt":"こんにちは！最近、ティラノスクリプトのプラグインをリリースしました。このプラグインは、ティラノスクリプトに表示されるメッセージを逐次VOICEVOX…","fields":{"slug":"/blog/2024-08-19-create_tyranoscript_plugin/"},"frontmatter":{"date":"2024/08/20","title":"ティラノスクリプトのプラグイン開発：VOICEVOXプラグインの経験から","description":null,"cover":null}}},{"node":{"excerpt":"我々が普段利用しているパソコンにはCPUが搭載されており、そのCPUはx86_64(AMD64)というアーキテクチャを持っている。しかし、Raspberry PiなどのARMベースのマイコンにはARM64というアーキテクチャを持っている。ARM64とx86_6…","fields":{"slug":"/blog/2023-01-26-build_docker_multi_architecture_with_github_action/GitHub_ActionでARM64とAMD64のDockerイメージをビルドする/"},"frontmatter":{"date":"2023/01/26","title":"GitHub_ActionでARM64とAMD64のDockerイメージをビルドする","description":null,"cover":null}}}]},"markdownRemark":{"id":"60db2d06-1157-5956-b0e1-2cf2f966372a","excerpt":"PHP のお勉強 PHP のお勉強 PHP コード php のコードは で囲まれた中に記述します。 変数 PHP…","fields":{"slug":"/blog/2020-01-06-start-php/","githubURL":"https://github.com/Ouvill/gatsbyjs_blog/tree/master/content/blog/2020-01-06-start-php/index.md"},"html":"

PHP のお勉強

\n

PHP のお勉強

\n

PHP コード

\n

php のコードは <?php ?>で囲まれた中に記述します。

\n
<?php\n// phpコードを記述する\n?>
\n

変数

\n

PHP の変数は $ をつける。大文字と小文字で区別される

\n
<?php\n$name=\"Ouvill\"\necho $name\n?>
\n

出力例

\n
Ouvill
\n

文字列を表示する

\n

echo で文字を表示できる

\n
<?php\n    echo \"Hello PHP!!<br/>\";\n    echo \"10 + 7<br/>\";\n    echo 10 + 7;\n?>
\n

表示例

\n
Hello PHP\n10 + 7\n17
\n

\"\"(ダブルクオーテーション)や''（シングルクオーテーションマーク）で囲まれたものは文字列になる

\n

\"\" と ” の違い

\n

\"\" で囲まれた文字列は変数展開ができる。''では変数展開されない。

\n
<?php\n    $hello = \"Hello World\"\n    echo \"変数展開される ${hello}\"\n    echo '変数展開されない ${hello}'\n?>
\n

出力例

\n
変数展開される Hello World\n変数展開されない ${hello}
\n

文字列の連結

\n

PHPでは、連結用の演算子.がある。\n. を利用することで文字列の連結ができる。

\n
<?php\n    $php = \"PHP\"\n    echo \"Hello\".$php\n?>
\n

出力例

\n
HelloPHP
\n

if 文、条件分岐

\n

他言語と同様に if 文がある

\n
<?php\nif ( 条件式 ) {\n    // true のとき\n} else { \n    // false のとき\n}\n?>
\n

for文

\n

他言語と同様に for 文がある

\n
<?php\nfor (初期値式; 条件式; 増減式) {\n    //ループ内容\n}\n?>
\n

例,1 ~ 100 までを出力する

\n
for ($i = 1; $i <= 100; $i++) {\n    echo $i.\"<br>\"\n
\n

foreach 文

\n

foreach ( 配列 as $key ) で要素に順番にアクセスできる。

\n
<?php\n$fruits = array(\"りんご\",\"みかん\",\"バナナ\")\nforeach ($fruits as $fruit) {\n    echo $fruit\n}\n?>
\n

連想配列の場合も利用できる.

\n
<?php\n  $a = array(\"Apple\" => \"りんご\", \"Orange\" => \"みかん\", \n             \"Grape\" => \"ぶどう\");\n      foreach( $a as $key => $value) {\n      print(\"$key は、$value<br>\\n\");\n     }\n?>
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で囲まれた文字列は変数展開ができる。"},{"type":"element","tagName":"code","properties":{"className":["language-text"]},"children":[{"type":"text","value":"''"}]},{"type":"text","value":"では変数展開されない。"}]},{"type":"text","value":"\n"},{"type":"element","tagName":"div","properties":{"className":["gatsby-highlight"],"dataLanguage":"php"},"children":[{"type":"element","tagName":"pre","properties":{"className":["language-php"]},"children":[{"type":"element","tagName":"code","properties":{"className":["language-php"]},"children":[{"type":"element","tagName":"span","properties":{"className":["token","php","language-php"]},"children":[{"type":"element","tagName":"span","properties":{"className":["token","delimiter","important"]},"children":[{"type":"text","value":""}]}]}]}]}]},{"type":"text","value":"\n"},{"type":"element","tagName":"p","properties":{},"children":[{"type":"text","value":"出力例"}]},{"type":"text","value":"\n"},{"type":"element","tagName":"div","properties":{"className":["gatsby-highlight"],"dataLanguage":"text"},"children":[{"type":"element","tagName":"pre","properties":{"className":["language-text"]},"children":[{"type":"element","tagName":"code","properties":{"className":["language-text"]},"children":[{"type":"text","value":"変数展開される 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