


Summary of PHP compression and archiving extension
Open the PHP manual, we can see that there are the following function libraries for processing compressed files,
Bzip2, LZF, Phar, Rar, Zip, Zlib
So what are the practical application scenarios of each type? Let’s take a look at it together.
Bzip2:
The official introduction is as follows:
The bzip2 function is used to transparently read and write bzip2 (.bz2) compressed files.
My own understanding is as follows:
This function library is to process files with .bz2 extension. This compression format is a commonly used compression format under Linux. Of course, it can also be used under Windows. . The specific operations are nothing more than compressing, decompressing, opening, writing, reading, closing and other operations on files. For specific usage of the function, please write your own test case.
LZF:
The official introduction is as follows:
LZF is a very fast compression algorithm, ideal for saving space with only slight speed cost. It can be optimized for speed or space at the time of compilation. It takes very little time to achieve the ideal space-saving effect. It can be used to optimize for speed or space at compile time.
You can use the compression function in this function library to compress a string and return the compressed string. You can also decompress the string compressed with this algorithm using the Function decompression.
Phar:
It is understood here that with this extension, multiple php files can be packaged into a php archive (.phar) document. And individual files inside can be used directly. You can also convert between tar zip phar three file formats.
Rar :This extension only gives methods to read Rar files. Cannot write.
Zip:
This extension allows you to transparently read and write ZIP archives and the files inside them.
Zlib:
This module allows you to transparently read and write gzip (.gz) compressed files
The above has introduced a summary of PHP compression and archiving extensions, including PHP and extension content. I hope it will be helpful to friends who are interested in PHP tutorials.

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)”。

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。


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