ASC Ⅱ code in php

About ASC Ⅱ code in php: this is a detailed page of ASC Ⅱ code in php. it introduces php, related knowledge, skills, experience, and some php source code.

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In the past, it took a lot of time to find the php code that can convert Chinese characters to ascii codes. UTF-8 is only one type of ascii code. Later I found it in the manual, changed it to batch conversion, and added a common ascii code restoration character. This code has been written for a while, and there is no time to post it. you can see that this class is not just a conversion of Chinese.

Class ascii
{

Function decode ($ str)
{
Preg_match_all ("/(d {2, 5})/", $ str, $ );
$ A = $ a [0];
Foreach ($ a as $ dec)
{
If ($ dec <128)
{
$ Utf. = chr ($ dec );
}
Else if ($ dec <2048)
{
$ Utf. = chr (192 + ($ dec-($ dec % 64)/64 ));
$ Utf. = chr (128 + ($ dec % 64 ));
}
Else
{
$ Utf. = chr (224 + ($ dec-($ dec % 4096)/4096 ));
$ Utf. = chr (128 + ($ dec % 4096)-($ dec % 64)/64 ));
$ Utf. = chr (128 + ($ dec % 64 ));
}
}
Return $ utf;
}

Function encode ($ c)
{
$ Len = strlen ($ c );
$ A = 0;
While ($ a <$ len)
{
$ Ud = 0;
If (ord ($ c {$ a}) >=0 & ord ($ c {$ a}) <= 127)
{
$ Ud = ord ($ c {$ });
$ A + = 1;
}
Else if (ord ($ c {$ a}) >=192 & ord ($ c {$ a}) <= 223)
{
$ Ud = (ord ($ c {$ a})-192) * 64 + (ord ($ c {$ a + 1})-128 );
$ A + = 2;
}
Else if (ord ($ c {$ a}) >=224 & ord ($ c {$ a}) <= 239)
{
$ Ud = (ord ($ c {$ a})-224) * 4096 + (ord ($ c {$ a + 1})-128) * 64 + (ord ($ c {$ a + 2})-128 );
$ A + = 3;
}
Else if (ord ($ c {$ a}) >=240 & ord ($ c {$ a}) <= 247)
{
$ Ud = (ord ($ c {$ a})-240) * 262144 + (ord ($ c {$ a + 1})-128) * 4096 + (ord ($ c {$ a + 2})-128) * 64 + (ord ($ c {$ a + 3})-128 );
$ A + = 4;
}
Else if (ord ($ c {$ a}) >=248 & ord ($ c {$ a}) <= 251)
{
$ Ud = (ord ($ c {$ a})-248) * 16777216 + (ord ($ c {$ a + 1})-128) * 262144 + (ord ($ c {$ a + 2})-128) * 4096 + (ord ($ c {$ a + 3})-128) * 64 + (ord ($ c {$ a + 4})-128 );
$ A + = 5;
}
Else if (ord ($ c {$ a}) >=252 & ord ($ c {$ a}) <= 253)
{
$ Ud = (ord ($ c {$ a})-252) * 1073741824 + (ord ($ c {$ a + 1})-128) * 16777216 + (ord ($ c {$ a + 2})-128) * 262144 + (ord ($ c {$ a + 3})-128) * 4096 + (ord ($ c {$ a + 4})-128) * 64 + (ord ($ c {$ a + 5})-128 );
$ A + = 6;
}
Else if (ord ($ c {$ a}) >=254 & ord ($ c {$ a}) <= 255)
{// Error
$ Ud = false;
}
$ Scill. = "& # $ ud ;";
}
Return $ scill;
}

Recently, a brother in the technical group raised the following question:

Format the auto-increment ID

A001-A999

B001-B999

......

Z001-Z999,

My initial idea was to split the if condition into A-Z letter in A loop,

However, this has a major disadvantage, and the code seems rigid and redundant. 26 English letters equals to 26 judgments.

Later, someone turned the letter into ASC Ⅱ code, which happens to be A-Z equal to 65-91 of ASC Ⅱ code;

In this way, you only need a function to format the ID:

Function format_string ($ num ){
$ Tag = floor ($ num-1)/999 );
// Part1 calculates the asc code
$ Part1 = 65 + $ tag;

// Part2 calculates the numeric part
$ Part2 = $ num-999 * $ tag;

$ A = strlen ($ part2 );

For ($ I = 0; $ I <(3-$ a); $ I ++)
{
$ B. = 0;
}
$ Str = chr ($ part1). $ B. $ part2;
Return $ str;
}

For ($ I = 1; I I <5000; $ I ++)
{
Echo $ str = format_string ($ I ).'
';
}

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