The so-called serialized object is to store the object in the session
All values in PHP can be represented by using the function serialize() to return a string containing a byte stream. The unserialize() function can change the string back to the original value of PHP. Serializing an object will save all the object's variables, but it will not save the object's methods, only the class name.
In order to be able to unserialize() an object, the object’s class must have been defined. If you serialize an object of class A, a string related to class A will be returned that contains the values of all variables in the object. If you want to deserialize an object in another file, the object's class must be defined before deserializing, either by including a file that defines the class or by using the function spl_autoload_register().
<?php // classa.inc: class A { public $one = 1; public function show_one() { echo $this->one; } } // page1.php: include("classa.inc"); $a = new A; $s = serialize($a); // 把变量$s保存起来以便文件page2.php能够读到 file_put_contents('store', $s); // page2.php: // 要正确了解序列化,必须包含下面一个文件 include("classa.inc"); $s = file_get_contents('store'); $a = unserialize($s); // 现在可以使用对象$a里面的函数 show_one() $a->show_one(); ?>
When an application uses the function session_register() to save objects into the session, these objects are automatically serialized at the end of each page and deserialized at the beginning of each page. So once the objects are saved in the session, they are available to pages throughout the application. However, the session_register() function has been deprecated in php5.3.0 and is no longer supported in php6.0.0, so do not rely on this function.
To serialize objects in your application for later use, it is highly recommended to include object class definitions throughout your application. Otherwise, it is possible that when deserializing an object, the definition of the class of the object is not found, and the class __PHP_Incomplete_Class_Name without a method is used as the class of the object, resulting in a useless object being returned.
So in the above example, when running session_register("a") and placing the variable $a in the session, the file classa.inc needs to be included in each page, instead of only the files page1.php and page2. php.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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