[英]How to properly rewrite php code from version 5.6 to 7.x?
我自己绑了它,但对我不起作用。 例如,如何正确更改此旧代码以与php 7.x兼容?
class DbSimple_Generic
{
function& connect($dsn)
{
// Load database driver and create its instance.
$parsed = DbSimple_Generic::parseDSN($dsn);
if (!$parsed) {
$dummy = null;
return $dummy;
}
$class = 'DbSimple_'.ucfirst($parsed['scheme']);
if (!class_exists($class)) {
$file = str_replace('_', '/', $class) . ".php";
if ($f = @fopen($file, "r", true)) {
fclose($f);
require_once($file);
} else {
$base = basename($file);
$dir = dirname(__FILE__);
if (@is_file($path = "$dir/$base")) {
require_once($path);
} else {
trigger_error("Error loading database driver: no file $file in include_path; no file $base in $dir", E_USER_ERROR);
return null;
}
}
}
$object =& new $class($parsed);
if (isset($parsed['ident_prefix'])) {
$object->setIdentPrefix($parsed['ident_prefix']);
}
class DbSimple_Mysql_Blob extends DbSimple_Generic_Blob
{
var $blobdata = null;
var $curSeek = 0;
function DbSimple_Mysql_Blob(&$database, $blobdata=null)
{
$this->blobdata = $blobdata;
$this->curSeek = 0;
}
function read($len)
{
$p = $this->curSeek;
$this->curSeek = min($this->curSeek + $len, strlen($this->blobdata));
return substr($this->blobdata, $this->curSeek, $len);
}
function write($data)
{
$this->blobdata .= $data;
}
function close()
{
return $this->blobdata;
}
function length()
{
return strlen($this->blobdata);
}
}
function& _performNewBlob($blobid=null)
{
$obj =& new DbSimple_Mysql_Blob($this, $blobid);
return $obj;
}
我试图使用各种可能的方法来使这项工作像这样:
$object = new $class($parsed);
$object->method();
对于PHP 7.x,这似乎是最有问题的部分:
$object =& new $class($parsed);
但这行不通。 我试图在一些PHP文档中找到它,但是到目前为止还没有运气。 那么如何正确重写呢? 谢谢
在具有Apache和mysql的Ubuntu Server 64位16.04+上使用此功能。
只是永远不要使用=&
运算符。 自PHP 5.0以来,它一直没有用,并在PHP 7.0中删除:
http://php.net/manual/zh/migration70.incompatible.php#migration70.incompatible.other.new-by-ref
您会在该页面上找到更多在PHP 7中不再起作用的内容。
了解该功能并以更简洁的方式重写可能是一个更好的主意,但是请在下面的更改中查找,希望对您有所帮助。
class DbSimple_Generic
{
function connect($dsn)
{
// Load database driver and create its instance.
$parsed = DbSimple_Generic::parseDSN($dsn);
if (!$parsed) {
$dummy = null;
return $dummy;
}
$class = 'DbSimple_'.ucfirst($parsed['scheme']);
if (!class_exists($class)) {
$file = str_replace('_', '/', $class) . ".php";
if ($f = @fopen($file, "r", true)) {
fclose($f);
require_once($file);
} else {
$base = basename($file);
$dir = dirname(__FILE__);
if (@is_file($path = "$dir/$base")) {
require_once($path);
} else {
trigger_error("Error loading database driver: no file $file in include_path; no file $base in $dir", E_USER_ERROR);
return null;
}
}
}
$object = new $class($parsed);
if (isset($parsed['ident_prefix'])) {
$object->setIdentPrefix($parsed['ident_prefix']);
}
}
public static function parseDSN($dsn){ // public or private depends on what you intend to do
// implementation here...
}
public function setIdentPrefix($identPrefix){
// implementation here...
}
}
class DbSimple_Mysql_Blob extends DbSimple_Generic_Blob
{
var $blobdata = null;
var $curSeek = 0;
function __construct($blobdata=null) // use __construct for class constructor
{
$this->blobdata = $blobdata;
$this->curSeek = 0;
}
function read($len)
{
$p = $this->curSeek;
$this->curSeek = min($this->curSeek + $len, strlen($this->blobdata));
return substr($this->blobdata, $this->curSeek, $len);
}
function write($data)
{
$this->blobdata .= $data;
}
function close()
{
return $this->blobdata;
}
function length()
{
return strlen($this->blobdata);
}
}
function _performNewBlob($blobid=null)
{
$obj = new DbSimple_Mysql_Blob($blobid); // no need to use &
return $obj;
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.