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  • Introduction to php magic method __invoke

    Introduction to php magic method __invoke

    Introduction to the PHP magic method __invoke: 1. Directly call the object name. When the method is used, the __invoke() method is called. 2. The object itself cannot be used directly as a function. If you remove the __invoke() method and still use the ob
    2022-05-27
  • How to get member attributes using __get in php

    How to get member attributes using __get in php

    __get obtains member attributes in PHP: 1. Private member attributes can be obtained outside the object. __get() not only obtains the private member variables of the current class, but can also perform other operations in this method. 2. If the member pro
    2022-05-27
  • The use of __callStatic method in php

    The use of __callStatic method in php

    The use of the __callStatic method in PHP: 1. It will be automatically called when the static method to be called does not exist or has insufficient permissions. 2. Same as the __call() method, accepting method name and array as parameters.
    2022-05-27
  • What is the __destruct method in php

    What is the __destruct method in php

    Introduction to the __destruct method in PHP: 1. It is automatically triggered when the class is destroyed. You can use the unset method to trigger this method. 2. An optional part of the class, usually used to complete some cleaning tasks before the obje
    2022-05-27
  • Common uses of Java Arrays class

    Common uses of Java Arrays class

    Common uses of the Java Arrays class: 1. toString method, outputs the array as a string according to the default format; 2. sort method, sorts the array in ascending order; 3. equals, compares whether the array elements are equal. If the array values ​​ar
    2022-05-27
  • Four ways to acquire locks in Java

    Four ways to acquire locks in Java

    There are four ways to acquire locks in Java: 1. The lock() method acquires the lock; 2. tryLock() tries to acquire the lock; 3. tryLock(long time, TimeUnit unit) will wait if it cannot get the lock; 4. lockInterruptibly() Interrupt thread waiting.
    2022-05-27
  • Notes on java custom exception classes

    Notes on java custom exception classes

    Notes on Java custom exception classes: 1. For a method of a parent class overridden by a subclass, the exception type thrown can only be a subclass of the exception class of the overridden method or itself. 2. Among them, it is necessary to distinguish:
    2022-05-26
  • How to encapsulate JDBC tool class in java

    How to encapsulate JDBC tool class in java

    The JDBC tool class is encapsulated in java: 1. Method to obtain the connection; 2. Method to obtain the database connection; 3. Method to release the connection; 4. Database connection object; 5. Object that executes the SQL statement and the result set
    2022-05-26
  • Solution to java ThreadLocal memory leak

    Solution to java ThreadLocal memory leak

    Solution to java ThreadLocal memory leak: 1. CleanSomeSlots() and expungeStaleEntry() methods can clear values ​​with null keys; 2. Clear all values ​​with null keys in ThreadLocalMap.
    2022-05-26
  • What is the JVM instruction system of java?

    What is the JVM instruction system of java?

    The JVM instruction system of java is: 1. Designed to implement the Java language. It contains instructions for calling methods and monitoring multi-priority systems; 2. The length of the 8-bit opcode in the VM allows the JVM to have a maximum of 256 inst
    2022-05-26
  • How to use __call method in php

    How to use __call method in php

    Usage of the __call method in PHP: 1. When the method to be called does not exist or has insufficient permissions, it will be called automatically. 2. First, rewrite the __call method. The __call method has two parameters, method and param, which correspo
    2022-05-25
  • The use of __clone in php

    The use of __clone in php

    The use of __clone in php: 1. Used for object copying. Object copying is accomplished through the clone keyword. 2. The __clone() method does not require any parameters. 3. While copying, if some attributes of the target object are different from those of
    2022-05-25
  • Two ways to generate user passwords in php

    Two ways to generate user passwords in php

    There are two ways to generate user passwords in PHP: 1. Hash passwords, which mainly use one-way dispersion algorithms to create password dispersion. 2. The md5 password is an asymmetric encryption. It's a good idea to add obfuscated strings when enc
    2022-05-25
  • Introduction to pipelines for PHP multi-process communication

    Introduction to pipelines for PHP multi-process communication

    Introduction to pipelines in PHP multi-process communication: 1. Pipes are a commonly used means of multi-process communication. Pipes are divided into unnamed pipes and named pipes. 2. Unnamed pipes can only be used for communication between processes th
    2022-05-25
  • What are php semaphores and shared memory?

    What are php semaphores and shared memory?

    Introduction to PHP semaphores and shared memory: 1. Semaphore: It is an atomic operation provided by the system. A number of signals can only be operated by one process at the same time. 2. Shared memory: It is a public memory area opened by the system i
    2022-05-25
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