Commonly used function objects in PHP_PHP tutorial
==========Character processing function=============
SQL statement reserved character escape
long get_magic_quotes_gpc(void)
string addslashes ( string str )
string stripslashes(string str)
ASCII code of character
int ord(string string) decimal
string chr(ascii) decimal octal (0) hexadecimal (0x )
string base_convert(string $number,int $frombase,int $tobase)
Clean string spaces
string trim(string,charlist) charlist, optional
string rtrim(string,charlist)
string ltrim(string,charlist)
Change letter case
string strtolower(string $str)
string strtoupper(string $str)
string ucfirst(string $str)
string ucwords(string $str)
Intercept string
array explode(separator,string,limit) limit, optional, the maximum number of array elements returned
string substr(string,start,length)
int strlen(string)
string strstr(string,search) case sensitive
string stristr(string,search)
string str_repeat(string,repeat)
String search
int strpos(string,find,start) start, optional
int substr_count(string,substring,start,length) start,length, optional
string str_replace(find,replace,string,count) count, optional .
string strrev(string $string) character flip, limited to one byte character
html processing
string htmlspecialchars(string,quotestyle,character-set) quotestyle, character-set, optional.
htmlentities("
I love you
",ENT_COMPAT,"GB2312")string htmlspecialchars_decode(string,quotestyle,character-set)
string htmlentities(string,quotestyle, character-set)
string html_entity_decode(string,quotestyle,character-set)
string strip_tags(string $str[,string $allowable_tags])
Date time [Y-m-d H:i:s]
----------------------------------
php set time zone
1. Generation fragment declaration
date_default_timezone_set (PRC);
2.php.ini definition
date.timezone = "PRC"
----------------------------------
double time(void)
float microtime(get_as_float) get_as_float, optional
string date(format,timestamp) timestamp, optional
array getdate(timestamp)
double mktime(hour, minute, second, month, day, year, is_dst)
array gettimeofday(return_float) return_float, optional, returns an array of time information such as seconds and microseconds
URL processing
array parse_url(string $url(,int $component = -1])
string urlencode(string $str)
string urldecode(string $str)
Get PHP environment extension and enable function library
array get_loaded_extensions([bool $zend_extensions = false])
array get_extension_funcs(string $module_name)
PREC regular expression
int preg_match ( string $pattern , string $subject [, array &$matches [, int $flags = 0 [, int $offset = 0 ]]] )
int preg_match_all ( string pattern, string subject, array matches [, int flags] )
mixed preg_replace ( mixed pattern, mixed replacement, mixed subject [, int limit] )
mysqli related classes
--mysqli class Connection between PHP and MySQL database
---Constructor
---mysqli(host,user,pass,db)
---Method
---set_charset(gbk)
---character_set_name()
---select_db(db)
---query(sql)
---prepare(sql) sql:insert into table values(?,?)
---close()
---attributes
---affected_rows
---error
--mysqli result class
---method
---fetch_array()
---close()
---attributes
---num_rows
--mysqli stmt class
---method
---bind_param(type,var...)
---execute()
---close( )
---attribute
---affected_rows
---error
---num_rows
---field_count select statistical attribute

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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