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指定文字数でランダムな文字列を作成するphp関数を作った

Posted at

はじめに

メール認証とかに使えそう...

コード

function random_words($limit,$is_flag = 0){
    $word = null;
    if($is_flag===0){
        $base_string = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',0,1,2,3,4,5,6,7,8,9];
    }else if($is_flag===1){
        $base_string = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
    }else if($is_flag===2){
        $base_string = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',0,1,2,3,4,5,6,7,8,9,'*','-','_'];
    }

    for( $i=0; $i<$limit; $i++ ) {
    	$word .= $base_string[mt_rand( 0, count($base_string)-1)];
    }
    return $word;
}

使い方

random_words(文字数制限,フラッグ);

フラッグの種類

0

デフォルト。英語文字と数字から文字列を作成する。

1

英語文字から文字列を作成する

2

英語文字・数字・記号(* or - or _)から文字列を作成s

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