PHP面向对象练习

练习内容：随机生成一个字符串

代码：

<?php
class randstring{

private $length;
private $type;
private $one = array(0,1,2,3,4,5,6,7,8,9);
private $two = array(0,1,2,3,4,5,6,7,8,9,'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');
private $three = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
function __construct($l,$t){

$this->length = $l;
$this->type = $t;

}
public function getString(){

if($this->type == 1){

$arr = array_rand($one,$this->length);
$string = explode("",$arr);
return $string;

}else if($this->type == 2){

$arr1 = array();
$arr = array_rand($this->two,$this->length);
for($i=0;$i<count($arr);$i++){

array_push($arr1,$this->two[$arr[$i]]);
}
echo implode("",$arr1);

}else if($this->type == 3){

$arr1 = array();
$arr = array_rand($this->three,$this->length);
for($i=0;$i<count($arr);$i++){

array_push($arr1,$this->three[$arr[$i]]);
}
echo implode("",$arr1);

}else{

echo '参数错误！';
}
}
}

$randstr = new randstring(10,2);

$randstr->getString();

?>

一些函数：

implode（）讲数组转换为字符串，可添加分隔符

array_rand() 随机抽取数组内元素的索引，如果加入第二个参数，则返回一个索引组成的数组。

array_push() 将数值填入到一个数组中

效果图：