字符串转化为数字？？？
今天遇到个比较奇怪的现象，很可能是我储备还不够吧，包含引号的数字的字符串转化为数字时出现了问题
"1000","902865066306","02865066306","SIP Phone","IP Trunk","","trunk20","ON2OFF","1333230069","1333230072","1333230134","65","62","Connected"
上面的为一段数据，接下来操作
$arr = '"1000","902865066306","02865066306","SIP Phone","IP Trunk","","trunk20","ON2OFF","1333230069","1333230072","1333230134","65","62","Connected"';
$arr = explode(',',$arr);
print_r($arr);
打印
Array
(
[0] => "1000"
[1] => "902865066306"
[2] => "02865066306"
[3] => "SIP Phone"
[4] => "IP Trunk"
[5] => ""
[6] => "trunk20"
[7] => "ON2OFF"
[8] => "1333230069"
[9] => "1333230072"
[10] => "1333230134"
[11] => "65"
[12] => "62"
[13] => "Connected"
)
我想把数组里的第九个拿出来来和其他的数据比较，平常把引号包围的字符串转为数字时就是在后面加个0就ok了，可是，今天不一样了
echo $arr[8] + 0; //结果为0
我就纳闷了，怎么会为0呢，$arr[8]明明有值啊，于是我又测试了下
$num = "1333230069";
echo $num+0;//1333230069
弄了好久没明白怎么回事，后来就用了两个办法解决了，一个是用正则把数字提出来，另一个是一开始就把字符串里的双引号全都替换为空。
可是疑惑还没有解决，嗦到现在，就是想问问大大们，为什么上面的做法会出现0的结果，而不是想要的数字。
[最优解释]
var_dump($arr[8]); //string(12) ""1333230069""
var_dump($num); //string(10) "1333230069"
这样看就清楚了，将 $arr[8] 的首尾双引号去掉后再运算就对了。
[其他解释]
没必要那么麻烦吧？
$arr = '"1000","902865066306","02865066306","SIP Phone","IP Trunk","","trunk20","ON2OFF","1333230069","1333230072","1333230134","65","62","Connected"';Array
$t = json_decode("[$arr]");
print_r($t);
(
[0] => 1000
[1] => 902865066306
[2] => 02865066306
[3] => SIP Phone
[4] => IP Trunk
[5] =>
[6] => trunk20
[7] => ON2OFF
[8] => 1333230069
[9] => 1333230072
[10] => 1333230134
[11] => 65
[12] => 62
[13] => Connected
)
也可以
$t = array_map( function($s) { return trim($s,'"'); }, explode(',', $arr)); // >= php 5.3
也可以
$t = array_map( create_function('$s', 'return trim($s,\'"\');'), explode(',', $arr)); // >= php 4
直接就处理成可用的数组
[其他解释]
对于你的疑问
不错
$num = "1333230069";
echo $num+0;//1333230069
但是 $arr[8] 是什么呢？
是 '"1333230069"'
echo $arr[8] + 0;
就是
echo '"1333230069"' + 0;
当然要输出 0 啦！
这样 echo '1333230069"' + 0;
就输出 1333230069 了
字符串转换成数字，是从左边开始去取数字字符的（左边的空格、+、-都是有效的）
[其他解释]
$a=str_getcsv($arr);
var_dump($a[8]);
[其他解释]
根据你提供的信息我自己也测试了下：
<?php
$arr= Array
(0 => "1000",
1 => "902865066306",
2 => "02865066306",
3 => "SIP Phone",
4 => "IP Trunk",
5 => "",
6 => "trunk20",
7 => "ON2OFF",
8 => "1333230069",
9 => "1333230072",
10 => "1333230134",
11 => "65",
12 => "62",
13 => "Connected"
);
echo gettype($arr[8])."<br>";
echo $arr[8]."<br>";
$str1=$arr[8]+0;
echo gettype($str1)."<br>";
echo ($str1)."<br>";
$num = "1333230069";
$num1=($num+0);
echo gettype($num)."<br>";
echo gettype($num1)."<br>";
echo $num1;
?>
输出结果是：
string
1333230069
integer
1333230069
string
integer
1333230069
发现没有出现楼主的问题。
[其他解释]
呀，满屏幕的勋章，都是牛人啊，明白了，多谢大大们的耐心解答！！！