unset

The blue ideals of initial, inherit, unset, revert, and all-little matches * Directory [1] initial [2] inherit [3] unset [4] revert [5] allPrevious In CSS, there are four keywords that can be theoretically applied to any CSS attribute. They are

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

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

In PHP, unset and array_splice are used to delete the elements in the array. The difference is unsetarray_splice. In PHP, unset and array_splice are used to delete elements in an array. if unsetarray_splice is used to delete an element in an array,

In PHP, the statement for releasing variables is called unset (since PHP4, unset is no longer a function, but a statement). A problem occurred when unset was used a few days ago, the unset problem is summarized as follows. If you have carefully read

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

Summary of magic methods in PHP: __construct, _ destruct, _ call, _ callstatic, __get, _ set, _ isset, _ unset, _ sleep, _ wakeup, _ tostring, _ set_state, _ clone and _ autoload 1. _ Get, _ setThese two methods are designed for attributes that

Unset for the shell built-in directives, you can delete variables or functions. Grammar unset [-fv][variable or function name] Parameters: -F Deletes only functions. -v deletes only variables. Instance Delete environment variables

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 (

PHP uses unset () to delete a cell (key) in an array This article mainly introduces PHP using unset () to delete a cell (key) in the array method, an example of the unset function in the deletion of the array unit of the use of skills, the need for

After unset is used in php to delete an element, the array index is not re-created because the index is not re-created. If you continue to use the index after unset, an error is returned. In this case, you can use array_values to re-create the array

Php reference transfer, reference return, and unset Source: hi.baidu.comkashifsblogitem928424f254888cbea50f524a.html? Referencing in PHP means accessing the same variable content with different names. This is not like the pointer of C. Instead, the

Php reference transfer, reference return and unreference and unset Original source: http://hi.baidu.com/kashifs/blog/item/928379f254888cbea50f524a.html? Referencing in PHP means that different names are used to access the same variable content. php

This article is mainly for PHP isset () and unset () functions of the use of a detailed introduction, the need for friends can come to the reference, I hope to be helpful to everyone Isset(PHP 3, PHP 4, PHP 5) Isset--Detect if the variable is

PHP reference passing, referencing return and dereference, and unset Original source: http://hi.baidu.com/kashifs/blog/item/928379f254888cbea50f524a.html ? Referencing in PHP means accessing the same variable content with a different name. This

The _ set () method is used to set private property values. The _ get () method is used to obtain private property values. The _ isset () method is used to check whether the private property value is set. The _ unset () method is used to delete

Unset,array_splice in PHP removes the difference between elements in an array It is very simple to delete an array element in PHP, but sometimes deleting an array requires some ordering of the index and we will use the relevant function, here we

PHP reference passing, referencing return and dereference, and unset Original source: http://hi.baidu.com/kashifs/blog/item/928379f254888cbea50f524a.html ? Referencing in PHP means accessing the same variable content with a different name. This

Isset(PHP 3, PHP 4, PHP 5) Isset--Detects whether a variable is set DescribeBOOL Isset (mixed var [, mixed Var [, ...]])Returns TRUE if VAR exists, otherwise returns FALSE. If you have freed a variable using unset (), it will no longer be isset ()