


A problem that has never been solved during development
The page is encoded in UTF8, and the template inclusion file method is used at the head and tail. As a result, there is an extra space of about 10px at the head and tail. OK, nothing.
The reason is that all UTF8 encoding is used. When including files, the final binary stream contains multiple UTF8 BOM tags. IE cannot parse pages containing multiple UTF8 BOM tags normally and directly replaces them with the actual displayed carriage return. This results in a blank line, but Firefox does not have this problem.
Therefore, if the template uses the inclusion method to contain multiple utf8 files and needs to be saved with ultraedit, just select utf8 and save it in no BOM format.
In addition, if the Chinese page puts the title tag in front of in the html head tag, it will cause the page to blank.
So utf8 pages should use the standard order
BOM header: xEFxBBxBF, PHP4 and 5 still ignore BOM, so they are output directly before parsing.
There is a dedicated description of this issue in the w3.org standard FAQ:
http://www.w3.org/International/questions/qa-utf8-bom
The details are as follows:
There is a character called "ZERO WIDTH NO-BREAK SPACE" in UCS encoding, and its encoding is FEFF. FFFE is a character that does not exist in UCS, so it should not appear in actual transmission. The UCS specification recommends that we transmit the characters "ZERO WIDTH NO-BREAK SPACE" before transmitting the byte stream. In this way, if the receiver receives FEFF, it indicates that the byte stream is Big-Endian; if it receives FFFE, it indicates that the byte stream is Little-Endian. Therefore, the character "ZERO WIDTH NO-BREAK SPACE" is also called BOM.
UTF-8 does not require a BOM to indicate the byte order, but can use the BOM to indicate the encoding method. The UTF-8 encoding of the character "ZERO WIDTH NO-BREAK SPACE" is EF BB BF. So if the receiver receives a byte stream starting with EF BB BF, it knows that it is UTF-8 encoded.
Windows is an operating system that uses BOM to mark the encoding method of text files: WindowsXP Professional, default character set: Chinese
1) Notepad: It can automatically identify UTF-8 encoded format files without BOM, but it cannot control whether to add BOM when saving the file. If the file is saved, BOM will be added uniformly.
2) editplus: cannot automatically recognize UTF-8 encoding format files without BOM. When saving the file, select UTF-8 format and will not write BOM header in the file header.
3) UltraEdit: The most powerful function for character encoding, it can automatically identify utf-8 files with BOM and without BOM (can be configured); when saving, you can choose whether to add BOM through configuration.
(It is important to note that when saving a newly created file, you need to choose to save it as utf-8 no bom format)
Later I discovered that Notepad ++ also has better support for utf-8 BOM, and I recommend everyone to use it.

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。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

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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