Jquery intercepts Chinese strings

Function cut_str ($ sourcestr, $ cutlength ){

$ Returnstr = '';

$ I = 0;

$ N = 0;

$ Str_length = strlen ($ sourcestr); // number of bytes of the string

While ($ n <$ cutlength) and ($ I <= $ str_length ))

{

$ Temp_str = substr ($ sourcestr, $ I, 1 );

$ Ascnum = ord ($ temp_str); // obtain the ASCII code of the $ I character in the string

If ($ ascnum> = 224) // If the ASCII bit height is 224,

{

// According to the UTF-8 encoding specification, count 3 consecutive characters as a single character

$ Returnstr = $ returnstr. substr ($ sourcestr, $ I, 3 );

$ I = $ I + 3; // The actual byte count is 3.

$ N ++; // string length Meter 1

}

Elseif ($ ascnum> = 192) // If the ASCII bit height is 192,

{

// According to the UTF-8 encoding specification, Count 2 consecutive characters as a single character

$ Returnstr = $ returnstr. substr ($ sourcestr, $ I, 2 );

$ I = $ I + 2; // The actual byte count is 2.

$ N ++; // string length Meter 1

}

Elseif ($ ascnum >=65 & $ ascnum <= 90) // if it is a capital letter,

{

$ Returnstr = $ returnstr. substr ($ sourcestr, $ I, 1 );

$ I = $ I + 1; // the actual number of bytes is still counted as 1

$ N ++; // consider the overall appearance. uppercase letters are counted as a high character.

}

Else // in other cases, including lower-case letters and halfwidth punctuation marks,

{

$ Returnstr = $ returnstr. substr ($ sourcestr, $ I, 1 );

$ I = $ I + 1; // the actual number of bytes is 1.

$ N = $ n + 0.5; // lower-case letters and halfwidth punctuation and half-height character width...

}

}

If ($ str_length> $ cutlength ){

$ Returnstr = $ returnstr. "..."; // when the length is exceeded, add a ellipsis at the end.

}

Return $ returnstr;

}