php decimal conversion functions are as follows: bindec() — Convert binary to decimal decbin() — Convert decimal to binary dechex() — Convert decimal to hexadecimal decoct() — Convert decimal to octal hexdec() — Ten Convert hexadecimal system to decimal system octdec() — Convert octal system to decimal system base_convert() – Convert numbers between any base systems. The application instructions are as follows: 1. Explanation of decimal system (decimal system) conversion function 1. Decimal system to binary system decbin() function, The following example echo decbin(12); //Output 1100 echo decbin(26); //Output 11010 decbin (PHP 3, PHP 4, PHP 5) decbin --
1. PHP base conversion function
Introduction: PHP base conversion function is as follows: bindec() — Binary conversion to decimal decbin() — Convert decimal to binary dechex() — Convert decimal to hexadecimal decoct() — Convert decimal to octal hexdec() — Convert hex to decimal octdec() — Convert octal to decimal base_convert( )– The application of converting numbers between arbitrary base systems is explained as follows: 1. Decimal system conversion function...
Introduction: php, function: A large summary of PHP mathematical operation functions. Classic. Worth collecting: This article summarizes and analyzes PHP mathematical operations. function. Share it with everyone for your reference, the details are as follows: 1. Description of commonly used functions: Abs: Get the absolute value. Acos: Get the arc cosine value. Asin: Get the arcsine value. Atan: Get the arctangent value. Atan2: Calculates the arctangent of a two number. base_convert: Convert the carry method of the number. BinDec: Convert binary to decimal. Ceil: Calculates the smallest integer greater than the specified number. Cos: cosine calculation. DecBin: Convert decimal to binary. DecHe
3. Analyze the conversion function between the carry systems that comes with PHP_PHP Tutorial
Introduction: Analyze the conversion function between PHP's own carry systems. bindec() -- Convert binary to decimal decbin() -- Convert decimal to binary dechex() -- Convert decimal to hexadecimal decoct() -- Convert decimal to octal hexdec() -- Hexadecimal
Introduction: PHP function ip2long conversion When the IP value is too large, a negative number is generated. // Use sprintf to return an unsigned decimal number $long = sprintf("%u",ip2long($ip)); // First convert to binary and then convert to decimal $long = bindec(decbin(ip2long($ip)) );
5. php function accumulation summary
Introduction: Math function: 10 commonly used ones marked in red. abs — Absolute acos — Inverse cosine acosh — Inverse hyperbolic cosine asin — Arc sine asinh — Inverse hyperbolic sine atan2 — Arc tangent of two parameters atan — Arc tangent atanh — Inverse hyperbolic tangent base_convert — Convert between arbitrary bases Numeric bindec - Binary to decimal conversion
6. How does PHP send a byte to a certain port of an IP
Introduction: How does PHP send a byte to a certain port of a certain IP? For example, if you send a byte to the 2012 port of 202.117.120.241, the 8 bits of the byte are 00100000. How to implement this? ------Solution--------------------$fp = fsoctopen('202.117.120.241', 2012);fwrite($fp, chr(bindec ('001
7. Convert binary data to decimal string
Introduction: Convert binary data to decimal string for help I have a string of Base64 data that is decoded into binary data. How can I convert this string of binary data into decimal and then output it as a string? I tried the bindec() function, but what I got was 0. Very It’s puzzling. I’ve tried other base conversion functions, but they don’t seem to work. Here’s my Base64 original data V3FwMbiBTiYKVBXgO68BwSRWUXQETmISFVKm
8. ! 01 Function to convert a long string into a hexadecimal string
Introduction: Help, help! 01 The function that converts a long string into a hexadecimal string is as mentioned in the title. Is there such a function in PHP? ------Solution idea---------------- ------The long string of 01 characters is a binary string. It can be converted into a decimal number using bindec. The decimal number can be converted into a decimal number using dechex. 
9. Analysis PHP’s built-in conversion function between carry systems
#Introduction: Analyze the conversion function between PHP’s built-in carry systems. bindec() -- Convert binary to decimal decbin() -- Convert decimal to binary dechex() -- Convert decimal to hexadecimal decoct() -- Convert decimal to octal hexdec() -- Hexadecimal
10. Convert binary data to decimal string
Introduction: Convert binary data to decimal string for help I have a string of Base64 After the data is decoded, it is binary data. How can I convert this string of binary data into decimal and then output it as a string? I tried the bindec() function, but what I got was 0. It’s very confusing. Other decimal conversions I have also tried the functions, but they don’t seem to work. Here is my Base64 original data V3FwMbiBTiYKVBXgO68BwSRWUXQETmISFVKm
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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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