php 获取随机字符串
php 获取随机字符串代码:
/** *$length 获取字符串的长度 *$isup 是否含有大写字母 *$max 最大的字母 */ if (! function_exists ( 'getRand' )) { function getRand($length = 10, $isup = false, $max = false) { if (is_int ( $max ) && $max > $length) { $length = mt_rand ( $length, $max ); } $output = ''; for($i = 0; $i < $length; $i ++) { if ($isup) { $which = mt_rand ( 0, 2 ); } else { $which = mt_rand ( 0, 1 ); } if ($which === 0) { $output .= mt_rand ( 0, 9 ); } elseif ($which === 1) { $output .= chr ( mt_rand ( 97, 122 ) ); } else { $output .= chr ( mt_rand ( 65, 90 ) ); } } return $output; } }