mb_strimwidth

mb_strimwidth will only append "trim_marker" if the string is over the width.*test code*     $HashTags = 'Results';     $socialmediatext = 'abcdefghijklmnopqrstuvwxyz';     for( $i=0; $i<=20; $i++ )     {         $socialmediatext .= '.';         $Twittext = mb_strimwidth($socialmediatext,0,35,$HashTags);         echo "<p>[".strlen($Twittext)."]$Twittext</p>";     }*output*[27]abcdefghijklmnopqrstuvwxyz.[28]abcdefghijklmnopqrstuvwxyz..[29]abcdefghijklmnopqrstuvwxyz...[30]abcdefghijklmnopqrstuvwxyz....[31]abcdefghijklmnopqrstuvwxyz.....[32]abcdefghijklmnopqrstuvwxyz......[33]abcdefghijklmnopqrstuvwxyz.......[34]abcdefghijklmnopqrstuvwxyz........[35]abcdefghijklmnopqrstuvwxyz.........[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results[35]abcdefghijklmnopqrstuvwxyz..Results

I see a lot of usage in the field where people rely on this function to truncate a string to a given length and append some chars at the end following example #1 in the above documentation.While this works just fine with Western alphabets, it should be noted that a string's width is NOT necessarily the same as its length.In Chinese, Japanese and Korean, some characters can be represented as full or half width, which may lead to unexpected results...<?php$str = ['English' => 'Switzerland',        'Half width' => 'ｽｲｽ',        'Full width' => 'スイス',       ];foreach ($str as $w => $s) {    printf("%-10s: %s (bytes=%d chars=%d width=%d)\nSubstring : %s\nTrim width: %s\n\n",        $w, $s,        strlen($s), mb_strlen($s), mb_strwidth($s),        mb_substr($s, 0, 3),        mb_strimwidth($s, 0, 3)    );}/* Output# With ASCII, chars == width, so everything works as expectedEnglish   : Switzerland (bytes=11 chars=11 width=11)Substring : SwiTrim width: Swi# With half-width katakanas, it works tooHalf width: ｽｲｽ (bytes=9 chars=3 width=3)Substring : ｽｲｽTrim width: ｽｲｽ# Full-width katakanas are twice as wide, so we only get the 1st 'su' !Full width: スイス (bytes=9 chars=3 width=6)Substring : スイスTrim width: ス*/>?