wordbeach 2012 ws php入門編
DESCRIPTION
WordBeach 2012 のワークショップ「PHP入門」編で使用したスライドです。TRANSCRIPT
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WordBeach 2012
WordPressのためのPHP入門
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お願い
誰でも最初は初心者です。分からない事は遠慮せず聞いて下さい。分からない時は、その場で聞いて下さい。
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ご注意
今日お話しする内容は、WordPressを前提にしてますので、
全ての場合に当てはまるとは限りません。
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これだけは覚えて
echovar_dump()
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レジュメ
1.PHPの基本2.変数3.文字列4.演算子5.配列
6.繰り返し7.条件分岐8.関数
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PHPの基本
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PHPの基本
エディタで編集拡張子文字コード2つの書き方 開始と終了
上から下へコメント
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エディタで編集
mi 秀丸 DreamWeaver
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拡張子
.php
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文字コード
UTF-8
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2つの書き方
PHP HTML + PHP
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プログラム
開始と終了
<?php
?>WordBeach 2012
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上から下へ
1行目
2行目
3行目
:
エラー
原因
実行
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/*ここにコメントを書きます。複数行でもOK!*/
コメント
// ここにコメントを書きます
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変数
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変数
変数とは名前の付け方
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変数とは
入るのはどれか1つだけ
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名前の付け方
$ 変数名
a~z A~Z 0~9
※数字から始まる名前はNG
「_」
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文字列
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文字列
文字列の定義エスケープシーケンス「”」と「’」の違い文字列中の変数
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文字列の定義
“ 文字列
または
”
‘ 文字列 ’
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エスケープシーケンス
Mac Win
\ ¥
文字の特殊な機能を無効にする特殊な文字を表す。
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「”」と「’」の違い
“ 変数を展開 ”
‘ 変数を展開しない ’
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文字列中の変数
“ { $変数 } ”
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演算子
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演算子
算術演算子代入演算子加算子/減算子比較演算子論理演算子文字列演算子
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算術演算子
+:加算ー:減算*:乗算/:除算%:剰余
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代入演算子
$a = 10; // 代入 $a += 5; // $a = $a + 5$a ー= 10; // $a = $a - 10$a *= 12; // $a = $a * 12$a /= 3; // $a = $a / 3$a %= 6; // $a = $a % 6
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代入演算子
$str = “Word”;$str .= “Press”;// $str = $str .“Press”;
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加算子/減算子
++:加算子$a++ // $a = $a + 1;ーー:減算子$a-- // $a = $a - 1;
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加算子/減算子は、位置によって結果が変わる。
加算子/減算子
$a = 5;$b = $a++; // $b=5, $a=6
$a = 5;$b = ++$a; // $b=6, $a=6
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比較演算子
==(=)!=(≠)<><=(≦)
>=(≧)
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比較演算子
比較した結果がその通りなら「true」を違っていれば「false」を返します。
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論理演算子
&&(論理積)||(論理和)! (否定)
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論理演算子
&&(論理積)&&(論理積)&&(論理積)条件1 条件2 結果
× × ×× ○ ×○ × ×○ ○ ○○:true ×:false○:true ×:false○:true ×:false
条件1
条件2
結果
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論理演算子
||(論理和)||(論理和)||(論理和)条件1 条件2 結果
× × ×× ○ ○○ × ○○ ○ ○○:true ×:false○:true ×:false○:true ×:false
条件1 条件2
結果
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論理演算子
!(否定)!(否定)
条件 結果
× ○
○ ×
○:true ×:false○:true ×:false
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文字列演算子
.(結合演算子)
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配列
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配列
配列連想配列2次元配列なぜ配列が必要なのか
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配列
添字は「0(ゼロ)」から
1つの車両(要素)にデータは1つ
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配列
配列を作るには、
$変数名 = array();
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配列
配列を定義するには、
または、$変数名 = array(値1,値2,…);
$変数名[] = 値1;$変数名[] = 値2; :
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配列
要素は後から追加できます。
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配列
配列に要素を追加するには、
$変数名[] = 値;
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連想配列
キーは「文字列」
1つの車両(要素)にデータは1つ
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連想配列
連想配列を作るには、
$変数名 = array();
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連想配列
連想配列を定義するには、
$変数名 = array( ‘キー1’ => 値1, ‘キー2’ => 値2, : );
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連想配列
または、
$変数名[‘キー1’] = 値1;$変数名[‘キー2’] = 値2; :
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連想配列
連想配列でも追加できます。
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連想配列
連想配列に要素を追加するには、
$変数名[‘キー’] = 値;
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2次元配列
要素に配列を入れる事も出来る。
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なぜ配列が必要なのか
例えば、100件の商品を表示するとします。
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配列を使わないと・・・
となります。
なぜ配列が必要なのか
001:echo $item001.”<br>\n”;002:echo $item002.”<br>\n”;003:echo $item003.”<br>\n”; :100:echo $item100.”<br>\n”;
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配列を使うと・・・
となります。
なぜ配列が必要なのか
001:for($i=0; $i<100; $i++){002: echo item[$i].”<br>\n”;003:}
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繰り返し
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繰り返し
WHILEFORFOREACH
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WHILE
回数が決まってない一定の状態の間づっと
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プログラム
WHILE
while(条件){
}WordBeach 2012
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WHILE
条件true
false
プログラム
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FOR
回数が決まっている
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プログラム
FOR
for(初期値;条件;増減式){
}WordBeach 2012
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WHILE
条件true
false
プログラム
増減式
初期化
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FOREACH
連想配列の要素の数だけ
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プログラム
FOREACH
foreach(連想配列 as 変数){
}WordBeach 2012
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FOREACH
要素ある
ない
プログラム
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プログラム
WHILE
while(条件):
endwhile;WordBeach 2012
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プログラム
FOR
for(初期値;条件;増減式):
endfor;WordBeach 2012
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プログラム
FOREACH
foreach(連想配列 as 変数):
endforeach;WordBeach 2012
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条件分岐
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条件分岐
IFSWITCH
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IF
if(条件){条件成立時のプログラム
}else{条件不成立時のプログラム
}
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IF
if(条件1){
}elseif(条件2){
}
}else{
:
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SWITCH
switch($変数){case 条件1:プログラム; break;case 条件2:プログラム; break;
default:プログラム; break;}
:
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IF
if(条件):条件成立時のプログラム
else:条件不成立時のプログラム
endif;
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IF
if(条件1):
elseif(条件2):
endif;
else:
:
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SWITCH
switch(条件):case 条件1: ~ endcase;case 条件2: ~ endcase;
default: ~ enddefault;endswitch;
:
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関数
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関数
関数とは関数の定義関数の呼び出し引数戻り値2つの変数
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関数とは
よく使う一連の処理をまとめたもの何回でも繰り返し使える最初からあるものと、自分で作るものがある
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一連の処理
関数の定義
function 関数名(引数){
}WordBeach 2012
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関数の呼び出し
関数名(引数);
関数名();
$変数=関数名();
$変数=関数名(引数);
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引数
関数に渡すデータ関数によって、種類も数も違う省略できる場合もあるない場合もある
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引数 = デフォルト値
引数
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戻り値
関数から戻って来るデータ1個だけ種類は色々ない場合もある
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戻り値を返すには、
戻り値を受け取るには、
戻り値
return 戻り値;
$変数 = 関数名();
$変数 = 関数名(引数);
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2つの変数
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課題
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課題
1.1~10までの合計2.九九の表(テーブル)を作る3.カレンダーを作る4.価格表を作る5.トランプを作る6.記事一覧を表示する7.カテゴリの記事一覧を表示する
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1-10までの合計
for
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九九の表を作る
for
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トランプを作る
forforeach
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記事一覧を表示する
ifwhilehave_posts()the_post()the_title()
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カテゴリの記事一覧
ifwhilehave_posts()the_post()the_title()query_posts()
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参考サイト
PHPPHPマニュアルhttp://jp.php.net/manual/ja/index.php
WordPressWordPress Codexhttp://wpdocs.sourceforge.jp/WordPress私的マニュアルhttp://elearn.jp/wpman/
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