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Home Backend Development PHP Problem What to do if php deserialization fails

What to do if php deserialization fails

Sep 12, 2020 am 10:18 AM
php Deserialization

php反序列化失敗是因?yàn)樾蛄谢瘮?shù)據(jù)時(shí)的編碼與反序列化時(shí)的編碼不一致導(dǎo)致的,其解決辦法就是使用處理過(guò)的單雙引號(hào),過(guò)濾“\r”的“mb_unserialize”方法即可成功反序列化。

What to do if php deserialization fails

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php unserialize 返回false的解決方法

php 提供serialize(序列化) 與unserialize(反序列化)方法。

使用serialize序列化后,再使用unserialize反序列化就可以獲取原來(lái)的數(shù)據(jù)。

<?php
$arr = array(
    &#39;name&#39; => &#39;fdipzone&#39;,
    &#39;gender&#39; => &#39;male&#39;
);

$str = serialize($arr); //序列化
echo &#39;serialize str:&#39;.$str."\r\n\r\n";

$content = unserialize($str); // 反序列化
echo "unserialize str:\r\n";
var_dump($content);
?>

輸出:

serialize str:a:2:{s:4:"name";s:8:"fdipzone";s:6:"gender";s:4:"male";}

unserialize str:
array(2) {
  ["name"]=>
  string(8) "fdipzone"
  ["gender"]=>
  string(4) "male"
}

但下面這個(gè)例子反序列化會(huì)返回false

<?php
$str = &#39;a:9:{s:4:"time";i:1405306402;s:4:"name";s:6:"新晨";s:5:"url";s:1:"-";s:4:"word";s:1:"-";s:5:"rpage";s:29:"http://www.baidu.com/test.html";s:5:"cpage";s:1:"-";s:2:"ip";s:15:"117.151.180.150";s:7:"ip_city";s:31:"中國(guó)北京市 北京市移動(dòng)";s:4:"miao";s:1:"5";}&#39;;
var_dump(unserialize($str)); // bool(false)
?>

檢查序列化后的字符串,發(fā)現(xiàn)出問(wèn)題是在兩處地方

s:5:"url"

s:29:"http://www.baidu.com/test.html"

這兩處應(yīng)為

s:3:"url"

s:30:"http://www.baidu.com/test.html"

出現(xiàn)這種問(wèn)題的原因是序列化數(shù)據(jù)時(shí)的編碼與反序列化時(shí)的編碼不一致導(dǎo)致,例如數(shù)據(jù)庫(kù)是latin1和UTF-8字符長(zhǎng)度不一樣。

另外有可能出問(wèn)題的還有單雙引號(hào),ascii字符"\0"被解析為 '\0',\0在C中是字符串的結(jié)束符等于chr(0),錯(cuò)誤解析后算了2個(gè)字符。

\r在計(jì)算長(zhǎng)度時(shí)也會(huì)出問(wèn)題。

解決方法如下:

// utf8
function mb_unserialize($serial_str) {
    $serial_str= preg_replace(&#39;!s:(\d+):"(.*?)";!se&#39;, "&#39;s:&#39;.strlen(&#39;$2&#39;).&#39;:\"$2\";&#39;", $serial_str );
    $serial_str= str_replace("\r", "", $serial_str);
    return unserialize($serial_str);
}

// ascii
function asc_unserialize($serial_str) {
    $serial_str = preg_replace(&#39;!s:(\d+):"(.*?)";!se&#39;, &#39;"s:".strlen("$2").":\"$2\";"&#39;, $serial_str );
    $serial_str= str_replace("\r", "", $serial_str);
    return unserialize($serial_str);
}

例子:

echo &#39;<meta http-equiv="content-type" content="text/html; charset=utf-8">&#39;;

// utf8
function mb_unserialize($serial_str) {
    $serial_str= preg_replace(&#39;!s:(\d+):"(.*?)";!se&#39;, "&#39;s:&#39;.strlen(&#39;$2&#39;).&#39;:\"$2\";&#39;", $serial_str );
    $serial_str= str_replace("\r", "", $serial_str);
    return unserialize($serial_str);
}

$str = &#39;a:9:{s:4:"time";i:1405306402;s:4:"name";s:6:"新晨";s:5:"url";s:1:"-";s:4:"word";s:1:"-";s:5:"rpage";s:29:"http://www.baidu.com/test.html";s:5:"cpage";s:1:"-";s:2:"ip";s:15:"117.151.180.150";s:7:"ip_city";s:31:"中國(guó)北京市 北京市移動(dòng)";s:4:"miao";s:1:"5";}&#39;;

var_dump(unserialize($str));    // false

var_dump(mb_unserialize($str)); // 正確

使用處理過(guò)單雙引號(hào),過(guò)濾\r的mb_unserialize方法就能成功反序列化了。

使用unserialize
bool(false)

使用mb_unserialize
array(9) {
  ["time"]=>
  int(1405306402)
  ["name"]=>
  string(6) "新晨"
  ["url"]=>
  string(1) "-"
  ["word"]=>
  string(1) "-"
  ["rpage"]=>
  string(30) "http://www.baidu.com/test.html"
  ["cpage"]=>
  string(1) "-"
  ["ip"]=>
  string(15) "117.151.180.150"
  ["ip_city"]=>
  string(31) "中國(guó)北京市 北京市移動(dòng)"
  ["miao"]=>
  string(1) "5"
}

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