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Chapter9 Arrays in PHP and their usage techniques (full version)
9-1 Definition and classification of arrays: Array elements are composed of keys and values
9-2 Array creation and access: 3 creation methods and 2 access methods
9-3 Using for loops to traverse arrays: indexing and associative arrays
9-4 Iterating through arrays using while loops: indexing and associative arrays
9-5 Using foreach loop to traverse: index and associative array
9-6 List structure: Convert elements of the default index array into variables
9-7 Use each() function to split the array elements into two representations: index and association for traversal
9-8 Use the list() structure and each() to complete the array traversal operation: must master
9-9 Get the values ​​of all elements in an array and return them in a default index array: array_values()
9-10 Get the key names of all elements and return them in the default index array: array_keys()
9-11 Check whether a key exists in the array: array_key_exists()
9-12 Check whether a value exists in the array: in_array()
9-13 Array statistical functions: count(), array_count_values() and array_unique()
9-14 Array filter array_filter(): callback function to process arrays
9-15 Array patroller array_walk(): uses callback function to traverse or update the array
9-16 Array mapper array_map(): Want to process multiple arrays at the same time? i can do it
9-17 Array sorting by value: sort() forward and rsort() reverse sorting functions
9-18 Array sorting by key name: ksort() ascending order and krsort() descending order function
9-19 Keep the key-value correspondence unchanged when sorting the array: asrot() and arsort() functions
9-20 To sort multiple arrays at the same time, the multi-dimensional array is first converted into a one-dimensional array by value: array_multisort()
9-21 Use arrays to implement stack operations: array_push and array_pop
9-22 Using arrays to implement queue operations: array_shift() and array_unshift() functions
9-23 Other array functions: array_rand()/array_sum()/shuffle()/range()
Chapter10 Essential lectures on classes and objects in PHP: You must understand this time
10-1 A quick introduction to object-oriented programming in PHP: the relationship between classes and objects
10-2 How to create a class and its properties and methods: naming conventions/access controls/pseudo variables
10-3 6 ways to create objects: Only using [new class name] is not a real PHP programmer
10-4 Creation and access of class constants: pay attention to the differences and connections with static properties
10-5 Class automatic loading technology: __autoload() and spl_autoload_register()
10-6 Class constructor and destructor methods: __construct() and __destruct()
10-7 Object encapsulation [not just security]: private, __get, __set, __isset, __unset
10-8 Class inheritance and polymorphism: extends and method overriding
10-9 Tips for creating and accessing static members in classes: static
10-10 Static binding and delayed binding technology of classes: detailed explanation of self, parent, static
10-11 Object cloning technology: Create new objects like variable value transfer
10-12 What should I do if I access a non-existent method or static method? Detailed explanation of __call() and __callSatatic()
10-13 Serialization of objects: a method of transmitting or saving an object
10-14 Abstract methods and abstract classes: templates for user classes
10-15 Implementation of interface technology: standardizing members and types of user classes
10-16 Declaration and usage skills of trait characteristics: Collection of class methods to achieve code reuse
10-17 Namespace: Although we have the same name and the same sex, we belong to different time and space
10-18 Object traversal: View object properties just like traversing an array
10-19 PHP5.6 extension to namespace: use can import functions and constant spaces