unset function in php

PHP unset Global variables can only destroy local variables in actual use, and can not achieve the purpose of global variables. Here we will deal with this problem concretely. Hope to help you. Some functions in the language of PHP are literally

First look at the unset function syntax unset Deletes a variable. Syntax: int unset (mixed Var); return value: Integer Function type: PHP system function Content Description This function deletes the variable and returns a true value for

In actual use, PHP unset global variables can only destroy local variables and cannot implement global variables. Next we will solve this problem in detail. Hope to help you. Some functions in PHP are literally hard to understand for beginners. You

Php variable destruction unset usage. Php Tutorial variable destruction unset usage unset -- release the given variable description voidunset (mixedvar [, mixedvar [,...]) unset () destroy the specified variable. Note: in PHP3, unset (php Tutorial

PHP5 object-oriented explanation-(10) _ set () _ get () _ isset () _ unset () four methods. This article briefly introduces four methods for PHP5 object-oriented explanation-(10) _ set () _ get () _ isset () _ unset, if you have any questions,

In php object-oriented language, _ set _ get _ isset _ unset usage is introduced. We often see the usage of bit _ set _ get _ isset _ unset in php object orientation, but we do not understand why we should use these items, next we will introduce one

The unset () function of PHP is used to clear and destroy variables. unused variables can be destroyed using unset. However, in some cases, the memory occupied by destroying variables cannot be reached with unset! The code is as follows: For ($ I =

The unset () function of PHP is used to clear and destroy variables. unused variables can be destroyed using unset. However, in some cases, the memory occupied by destroying variables cannot be reached with unset! Copy codeThe code is as

Transferred from the Prophet Community https://xz.aliyun.com/t/24430x00 PrefaceUsually the site background can be configured to allow uploading attachments file type, general login background, add PHP type can upload php file Getshell. However, as

The PHP unset () function is used to clear, destroy variables, and we can destroy them with unset (). But at some point, using unset () does not achieve the memory that is consumed by destroying variables! Let's look at an example first: