Simple character encryption with PHP _ PHP Tutorial-php Tutorial

Use PHP for simple character encryption. There is nothing to do. I want to try encryption, so I used my familiar PHP to write it... principle: convert a character into an ASCII code, convert the ASCII code, convert the result into a character, and complete encryption. try encryption, so I used my familiar PHP to write...

Principle:

Convert characters into ASCII codes, convert the ASCII codes, convert the results into characters, and complete encryption.

?

Implementation:

Enter the characters to encrypt:

Error_reporting (255 );

If (isset ($ val ))

{

? // Encrypt

?? For ($ I = 0; $ I

? {

?? $ C = $ value [$ I];

?? $ C = ord ($ c );

?? If ($ c> 31 & $ c <107)

?? {

??? $ C = $ c + 20;

??? Print ("character before encryption:". $ val );

??? Print ("

Encrypted characters: ". chr ($ c ));

??? Print ("

");

??}?

?? Elseif ($ c> 106 & $ c <127)

?? {

??? $ C = $ C-75;

??? Print ("character before encryption:". $ val );

??? Print ("

Encrypted characters: ". chr ($ c ));

??? Print ("

");??

??}

?}

}

Else

{

? Print ("Enter the characters you want to encrypt ");

}

?>

During the conversion process of asc, pay attention to some problems. for example, if asc is from 0 to 127, then asc Greater than 127 or less than 0 cannot appear during conversion, this should be well controlled. it is best to make a table by yourself.

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Principle: convert the character into ASCII code, convert the ASCII code, convert the result into a character, and complete encryption...