How to use PHP to implement javascript escape and unescape functions _ PHP Tutorial

How to use PHP to implement javascript escape and unescape functions. Front-end developers know that javascript has the encoding function escape () and the corresponding decoding function unescape (), while php only has the urlencode and urldecode, this encoding and decoding function is known to encodeURI and front-end developers that javascript has the encoding function escape () and the corresponding decoding function unescape (), while php only has urlencode and urldecode, this encoding and decoding function is valid for encodeURI and encodeURIComponent, but is invalid for escape.
The escape () function and the unescape () function in javascript are user string encoded. similar to the urlencode () function in PHP, the following is the escape function code implemented by php:

The code is as follows:

/**
* Js escape php implementation
* @ Param $ string the sting want to be escaped
* @ Param $ in_encoding
* @ Param $ out_encoding
*/
Function escape ($ string, $ in_encoding = 'utf-8', $ out_encoding = 'ucs-2 '){
$ Return = '';
If (function_exists ('MB _ get_info ')){
For ($ x = 0; $ x <mb_strlen ($ string, $ in_encoding); $ x ++ ){
$ Str = mb_substr ($ string, $ x, 1, $ in_encoding );
If (strlen ($ str)> 1) {// multi-byte characters
$ Return. = '% u'. strtoupper (bin2hex (mb_convert_encoding ($ str, $ out_encoding, $ in_encoding )));
} Else {
$ Return. = '%'. strtoupper (bin2hex ($ str ));
}
}
}
Return $ return;
}

The corresponding code for decoding php unescape is:

The code is as follows:

Function unescape ($ str)
{
$ Ret = '';
$ Len = strlen ($ str );
For ($ I = 0; $ I <$ len; $ I ++)
{
If ($ str [$ I] = '%' & $ str [$ I + 1] = 'u ')
{
$ Val = hexdec (substr ($ str, $ I + 2, 4 ));
If ($ val <0x7f)
$ Ret. = chr ($ val );
Else
If ($ val <0x800)
$ Ret. = chr (0xc0 | ($ val> 6 )).
Chr (0x80 | ($ val & 0x3f ));
Else
$ Ret. = chr (0xe0 | ($ val> 12 )).
Chr (0x80 | ($ val> 6) & 0x3f )).
Chr (0x80 | ($ val & 0x3f ));
$ I + = 5;
} Else
If ($ str [$ I] = '% ')
{
$ Ret. = urldecode (substr ($ str, $ I, 3 ));
$ I + = 2;
} Else
$ Ret. = $ str [$ I];
}
Return $ ret;
}

Parse () and the corresponding decoding function unescape (), while php only has urlencode and urldecode. this encoding and decoding function is for encodeURI and...