language unset

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

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

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

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

Will PHP unset release the memory ?. First, let's look at an example of var_dump (memory_get_usage (); $ alaruence; var_dump (memory_get_usage (); unset ($ a); var_dump (memory_get_usage ()); output (on my PC, let's look at an example

Some people say that PHP's unset does not really release memory, some say, PHP unset only in the release of large variables (a large number of strings, large arrays) when the real free memory, but also said that in the PHP level to discuss memory is

First, let's look at an example.Var_dump (memory_get_usage ());$ A = "laruence ";Var_dump (memory_get_usage ());Unset ($ );Var_dump (memory_get_usage ());Output (on my PC, the load extension may vary depending on the system, PHP version, and load

First let's look at an example Copy Code code as follows: Var_dump (Memory_get_usage ()); $a = "laruence"; Var_dump (Memory_get_usage ()); unset ($a); Var_dump (Memory_get_usage ()); The output (on my PC, may vary

Void Unset (Mixed $ VaR [, Mixed $ VaR [, $... ]) Unset ()Destroys the specified variable. Note that in PHP 3,Unset ()ReturnsTrue(Actually an integer value of 1), while in PHP 4,Unset ()It is no longer a real function: it is now a statement. In

This article mainly introduces the usage of isset () and unset () functions in PHP in detail. if you need them, you can refer to them and hope to help you. Isset(PHP 3, PHP 4, PHP 5) Isset -- check whether the variable is set DescriptionBool isset (