==========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把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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