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  • Analysis of the working principle of php iterator

    Analysis of the working principle of php iterator

    Analysis of the working principle of PHP iterator: 1. Before the first iteration, run the iterator method. 2. Verify whether the first element is valid. 3. foreach continues to call Iterator. 4. The method body of foreach. 5. After each iteration, call th
    2022-06-07
  • The role of php iterator iterator

    The role of php iterator iterator

    The functions of PHP iterator: 1. When executing the foreach object, it is automatically called and specifies the traversal method. 2. Iterator is a predefined interface class in PHP and can be used directly. iterator{} is a subclass of Traversable{}.
    2022-06-07
  • The use of foreach in php

    The use of foreach in php

    The use of foreach in PHP: 1. Foreach is a tool through objects. It can be used alone or with iterators and generators. 2. If foreach is defined as a class, all attributes can be output. If it is called as a function outside the category, only public attr
    2022-06-07
  • Comparison of two definition methods in php constants

    Comparison of two definition methods in php constants

    Comparison of two definition methods in PHP constants: 1. const defines PI as a variable. Defined constants can only be placed in the top directory and cannot be placed in if statements or {} in functions. 2. define is a macro definition, and defined cons
    2022-06-06
  • How to understand php command mode

    How to understand php command mode

    Understanding of PHP command mode: 1. Encapsulate the request into an object, allowing different requests to be used to parameterize customers. Queue or log requests and support undoable actions. 2. It is composed of command abstract class, concrete comma
    2022-06-06
  • Comparison of PHP pass by value and pass by reference

    Comparison of PHP pass by value and pass by reference

    Comparison of PHP pass-by-value and pass-by-reference: 1. PHP must copy the value in pass-by-value. Especially for large strings and objects, this will be an expensive operation. 2. Passing by reference does not require copying the value, which is benefic
    2022-05-31
  • Usage of php empty() function

    Usage of php empty() function

    Usage of php empty() function: 1. Used to detect whether the variable is empty. 2. If the variable does not exist, or its value is equal to FALSE, it is considered not to exist. If there are no variables, empty() will not issue a warning.
    2022-05-30
  • The proximity principle of $this in php

    The proximity principle of $this in php

    The proximity principle of $this in PHP: 1. The proximity principle of $this applies not only to private attributes, but also to private member methods. 2. $this refers to the called object, but when dealing with private attributes and methods, the proxim
    2022-05-30
  • php $this what does it mean

    php $this what does it mean

    The meaning of php $this: 1. $this is a reference to the current object. There is a pointer in $this. Whoever calls it will point to it. It can only be used within the class. 2. $this cannot be used to access static properties, because static properties a
    2022-05-30
  • What is the php automatic loading mechanism?

    What is the php automatic loading mechanism?

    Introduction to the PHP automatic loading mechanism: 1. Automatic loading means that when instantiating, PHP automatically hands over the required files to require, and there is no need to manually require. 2. Laravel, thinkphp, yii2 and other frameworks
    2022-05-30
  • What is CLI mode in php

    What is CLI mode in php

    Introduction to CLI mode in php: 1. It is the interface for PHP to run on the command line, which is different from the PHP environment running on the web server. 2. Advantages: When using multiple processes, after the child process ends, the kernel is re
    2022-05-30
  • Use of __sleep method in php

    Use of __sleep method in php

    The use of __sleep method in php: 1. Automatically called when serialize() is called outside the class. 2. The __sleep() method is usually used to submit uncommitted data or similar cleaning operations. This feature is useful if you have some large object
    2022-05-30
  • How to create a java project using eclipse

    How to create a java project using eclipse

    1. Open eclipse and click file; 2. Click the new and JAVA PROJECT options in sequence; 3. Enter the new project; 4. Create a new java project and click the src package under the project; 5. Enter the new page; 6. Enter class , click finish.
    2022-05-30
  • Detailed installation of java IntelliJ IDEA

    Detailed installation of java IntelliJ IDEA

    Detailed installation instructions for java IntelliJ IDEA: 1. Run the downloaded exe file; 2. Click next; 3. Customize the installation directory and click next; 4. Check 64-bit and select all plug-ins. Click next; 5. Click install.
    2022-05-30
  • Use of __isset method in php

    Use of __isset method in php

    The use of __isset method in php: 1. isset() is a function used to determine whether a variable is set. It passes in a variable as a parameter. If the passed in variable exists, true is returned, otherwise false is returned. 2. It will be automatically ca
    2022-05-27
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