回答編集履歴
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追記
answer
CHANGED
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@@ -31,4 +31,41 @@
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eof;
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?>
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```
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#追記
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workは複数選択可能にしたいのであればこんな感じで
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```PHP
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<?php
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//初期設定
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$selected["work"]=array_fill_keys([1,2,3,4],'');
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$selected["sex"]=array_fill_keys([1,2],'');
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//値セット
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$replacement=array_fill_keys(filter_input(INPUT_GET,"work",FILTER_DEFAULT,FILTER_REQUIRE_ARRAY)?:array(),' selected');
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$selected["work"]=array_replace($selected["work"],$replacement);
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$selected["sex"][filter_input(INPUT_GET,"sex")]=" selected";
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print <<<eof
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<html>
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<body>
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<form method="GET">
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<select name="work[]" multiple>
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<option value="1"{$selected["work"][1]}>学生</option>
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<option value="2"{$selected["work"][2]}>会社員</option>
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<option value="3"{$selected["work"][3]}>公務員</option>
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<option value="4"{$selected["work"][4]}>主婦</option>
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</select>
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<select name="sex">
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<option value="1"{$selected["sex"][1]}>男</option>
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<option value="2"{$selected["sex"][2]}>女</option>
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</select> <input type="submit" name="search" value="検索">
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</form>
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</body>
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</html>
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eof;
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?>
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```
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