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__PHP_Incomplete_Class Object vs __PHP_Incomplete_Class_Name

When you meet '__PHP_Incomplete_Class_Name' by using unserialize , please confirm whether you have included the class file in serialized contents before you use unserialize function.

For example:

Include class

/*SimpleClass.php*/
class SimpleClass{
    var $key;
    function SimpleClass(){
     
    }
    function __set($name,$value){
        $this->key[$name] = $value;
    }
    function __get($name){
        return $this->key[$key];
    }
}
?>

Write file

/*Store.php
 */
require_once './SimpleClass.php';
$SimpleClass = new SimpleClass;
$SimpleClass->keywords = 'Google';
@file_put_contents('./aaa.txt', serialize($SimpleClass));
?>

Wrong Read file 

/*Read.php
 */
$SimpleClass = unserialize(file_get_contents('./aaa.txt'));
print_r($SimpleClass);
?>

Wrong Output 

__PHP_Incomplete_Class Object
(
    [__PHP_Incomplete_Class_Name] => SimpleClass
    [key] => Array
        (
            [keywords] => Google
        )
)

In order to resolve this problem, you have to include the class file in serialized contents before you use unserialize function.

Correct Read File

/*Read.php
 */
require_once './SimpleClass.php';
$SimpleClass = unserialize(file_get_contents('./aaa.txt'));
print_r($SimpleClass);
?>

Correct Output

SimpleClass Object
(
    [key] => Array
        (
            [keywords] => Google
        )
)

resolutions for java version different from javac on centos 6.3

sudo java --verison

java version "1.6.0_24"

sudo javac --version //javac 1.7
javac 1.7.0_07


To install/ register a JVM use the following

1  /usr/sbin/alternatives --install "/usr/bin/java" "java" "/usr/java/default/bin/java" 2
2  /usr/sbin/alternatives --install "/usr/bin/javac" "javac" "/usr/java/default/bin/javac" 2

And to configure systemwide changes use
3  /usr/sbin/alternatives --configure java 
  or 
  /usr/sbin/alternatives --config java
4 /usr/sbin/alternatives --configure javac
  or 
  /usr/sbin/alternatives --config javac




sudo java --verison


java version "1.7.0_07"


sudo javac --version //javac 1.7
javac 1.7.0_07

SQL_CALC_FOUND_ROWS + FOUND_ROWS()

When we want to list contents based on different pages, we have to do: one get a result set , another count the total number of rows. In general, we will use two query sql to complete this process.

1. SELECT id, title FROM articles WHERE TRUE LIMIT $limit, $start
2  SELECT count(id) as total FROM articles WHERE TRUE

From the above query, we may know the MySQL server will execute twice to scan all articles (query 1 will calculate result set size even when this is not needed). If the articles have more 1 million, the two queries need more times.

Fortunately, the MySQL server provide one methods to remember total records at executing the first query. So after executing the first, we just get the total records based on the first query, not executing the second query. Then we will save more half time. Now I give one example to complete this process.

3. SELECT SQL_CALC_FOUND_ROWS id, title FROM articles WHERE TRUE LIMIT $limit, $start
4.  SELECT FOUND_ROWS() as total

The query 3 will scan all records, but the query 4 will not scan all records of the table. The executing efficiency will improve most.

For details about this method, please refer MySQL reference manual from http://dev.mysql.com/doc/refman/5.1/en/information-functions.html

Good luck.