PHP常用函数对象
==========字符处理函数=============
SQL语句保留字符转义
long get_magic_quotes_gpc(void)
string addslashes ( string str )
string stripslashes(string str)
字符的ASCII码
int ord(string string) 十进制
string chr(ascii) 十进制 八进制(0) 十六进制(0x)
string base_convert(string $number,int $frombase,int $tobase)
清理字符串空格
string trim(string,charlist) charlist,可选
string rtrim(string,charlist)
string ltrim(string,charlist)
改变字母大小写
string strtolower(string $str)
string strtoupper(string $str)
string ucfirst(string $str)
string ucwords(string $str)
截取字符串
array explode(separator,string,limit) limit,可选,返回的数组元素的最大数目
string substr(string,start,length)
int strlen(string)
string strstr(string,search) 大小写敏感
string stristr(string,search)
string str_repeat(string,repeat)
字符串查找
int strpos(string,find,start) start,可选
int substr_count(string,substring,start,length) start,length,可选
string str_replace(find,replace,string,count) count,可选。
string strrev(string $string) 字符翻转,限一个字节字符
html处理
string htmlspecialchars(string,quotestyle,character-set) quotestyle,character-set,可选。
htmlentities("
我爱你
",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])
日期时间[Y-m-d H:i:s]
-----------------------------------
php 设置时区
1.代片断声明
date_default_timezone_set (PRC);
2.php.ini定义
date.timezone = "PRC"
-----------------------------------
double time(void)
float microtime(get_as_float) get_as_float,可选
string date(format,timestamp) timestamp,可选
array getdate(timestamp)
double mktime(hour,minute,second,month,day,year,is_dst)
array gettimeofday(return_float) return_float,可选,返回一个秒与微秒等时间信息的数组
URL处理
array parse_url(string $url(,int $component = -1])
string urlencode(string $str)
string urldecode(string $str)
获取PHP环境扩展与启用函数库
array get_loaded_extensions([bool $zend_extensions = false])
array get_extension_funcs(string $module_name)
PREC正则表达式
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相关类
--mysqli类 PHP 和 MySQL 数据库之间的连接
---构造函数
---mysqli(host,user,pass,db)
---方法
---set_charset(gbk)
---character_set_name()
---select_db(db)
---query(sql)
---prepare(sql) sql:insert into table values(?,?)
---close()
---属性
---affected_rows
---error
--mysqli result类
---方法
---fetch_array()
---close()
---属性
---num_rows
--mysqli stmt类
---方法
---bind_param(type,var...)
---execute()
---close()
---属性
---affected_rows
---error
---num_rows
---field_count select统计属性

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PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP and Python each have their own advantages and are suitable for different scenarios. 1.PHP is suitable for web development and provides built-in web servers and rich function libraries. 2. Python is suitable for data science and machine learning, with concise syntax and a powerful standard library. When choosing, it should be decided based on project requirements.
