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@kazu56

【PHP】0埋め

Posted at 
echo sprintf('%02d', 1); // 01
echo sprintf('%03d', 1); // 001
echo sprintf('あなたのIDは%04dです', 1); // あなたのIDは0001です

参考
PHPで0埋めをする2つの方法- sprintf関数とstr_pad関数

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