這樣寫對嗎?

function code ($type,$length='4')

{

$text = array("1","2","3","4","5","6","7","8","9");

$alphabetic = array("a","b","c","d","e","f","g","h","i");

$mix = array_merge((array)$text, (array)$alphabetic);

$code = "";

switch ($type) {

case 'mix':

for ($i=1; $i<=$length; $i++) {

$code .= $mix[rand(0, count($mix)-1)];

}

break;

case 'number':

for ($i=1; $i<=$length; $i++) {

$code .= $text[rand(0, count($text)-1)];

}

break;

case 'words':

for ($i=1; $i<=$length; $i++) {

$code .= $alphabetic[rand(0, count($alphabetic)-1)];

}

break;

}

return $code;

}

慕粉3403362

2016-12-09

源自：PHP進階篇-函數 5-1

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2 回答

開03975976 回答被采納 +3 積分
2016-12-17

$text=implode(range(0,0),range("a","z"),range("A","Z"));

$text=str_shuffle($text);

$text=substr( $text,0,4);----------------------------

$rand_color=imagecolorallocate($image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255));

$xuehua=imagesetpixel($image,?mt_rand(0, $width), mt_rand(0,$height), $color);

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Wseek
2017-04-23

<?php
function?code($type,?$length?=?4)
{
????$num?=?"0123456789";
????$word?=?"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
????$code?=?"";
????switch?($type)?{
????????case?1:
????????????for?($i?=?1;?$i?<=?$length;?$i++)?{
????????????????$code?.=?substr($num,?rand(0,?9),?1);
????????????}
????????????break;
????????case?2:
????????????for?($i?=?1;?$i?<=?$length;?$i++)?{
????????????????$code?.=?substr($word,?rand(0,?51),?1);
????????????}
????????????break;
????????case?3:
????????????for?($i?=?1;?$i?<=?$length;?$i++)?{
????????????????$code?.=?substr($num?.?$word,?rand(0,?61),?1);
????????????}
????????????break;
????????default:
????????????return?'請選擇正確的類型：1數字驗證碼，2字母驗證碼，3數字+字母驗證碼。';
????????????break;
????}
????return?$code;
}

echo?code(3,5);