The boss is not in, the arrogant regular

Hi

Rt

1. Regular expressions

--preg_grep ($pattern, Array$input)

Castrated version Preg_filter (), only match does not replace

--preg_split ($pattern, $subject)

Returns an array that splits the $subject at the $pattern split point

--preg_quote ($STR)

Escaping a regular operator to prevent confusion

.\+*? [^]$ () {}=!<>|:-

--Summary

Commonality: all start with Preg_

Basically the first parameter is $pattern

Usage: Form Validation-match

Illegal word filter-replace

Basic syntax for---regular expressions

--delimiter, Atom, quantifier, boundary control, mode unit

--delimiter:/or # or {} (usually not curly braces, too much ambiguity)

-Start and end positions

-$pattern = '/string/';

--regexpal Tools

-http://regexpal.isbadguy.com/

--Atomic

-Minimum matching units

-Visible atoms (Unicode encoded tables are visible in the mean keyboard): punctuation, various language literals, physics formula symbols, other visible characters

-Invisible atom: line break \ n, enter \ r, tab \ T, space, other

-usually direct input, meet duplicate or keyword, plus escape, such as \$

--Meta character

-Filter

| Match two or more, that is, or

[] match any atom in parentheses, special [1-3], here--the meaning of "to"

[^] ditto for reciprocal, matching all atoms in parentheses except

Note: With ^ to be careful, it will match all other invisible atoms, including spaces, and then there is the ^ to be written with the other atoms close to the head

-Define the set of atoms

. equivalent to [^\n], matches any character except newline characters--basically all

\d [0-9] matches a decimal number

\d [^0-9] matches a non-decimal digit

\w [0-9a-za-z] matches a number, letter, or underscore

\w [^0-9a-za-z] matches a non-numeric, letter, or underscore

\s matches a non-visible atom

\s matches a visible atom

--quantifier

-Indicates how many times an atom appears in succession

-{n} indicates that the atom in front of it happens to be n times in a row--5{3}

-{n,} indicates that the atom in front of it appears at least n consecutive times

-{N,M} [f|5]{3,6} indicates n times, up to M times, N to M

-* any time, as long as continuous, all match, {0,}

-? {0,1}0 to 1 times

-+ {1,} at least 1 times

2. PHP

---object-oriented

--What is an object

-object oriented (OO)

-All things are objects--all visible, invisible (an abstract concept), something

--The basic composition of the object

-Two parts: Properties and Methods

-Properties: Data model that describes the data of an object

-Method: Behavioral model for describing what the object can do

--Characteristics of the object

-Unique

-is a specific thing, function is to complete a specific function

-it can be reused.

-What is a Face object

-oriented, that is, programming is always thinking about the object (...)

-Object-oriented, that is, when programming, all data structures are stored through the structure of the object

-why: How objects are described (ideas), more fit to the real situation, and conducive to the understanding of large business

--Facing the substance of the object

-Store all the problems in your life in the form of objects, attributes + methods

-Interaction between objects and objects: completion of method invocation (consider the example of James playing basketball)

--The basic idea of object-oriented

-First step, identify the object

-Step two, identify the properties of the object--different types of concerns, different business logic for different objects

-Step three, identify the behavior of the object (through the behavior to identify its method)

--The basic principle of object-oriented

-The interior is high cohesion: only responsible for a specific function; The object's contents are all encapsulated inside, the attribute + method

-External is low-coupling: external only see some properties of the object, part of the method (behavior)-low coupling is more important than cohesion

The boss is not in, the arrogant regular