The most accurate PHP intercept string length function, intercept string _php tutorial

The most accurate PHP intercept string length function, intercept string

Said is the most accurate interception length, in fact, I am not sure whether it is the most accurate, specific how accurate to see the following effect will know:
First, the string for the test:

<?php header ("Content-type:text/html;charset=utf-8"); echo Cn_substr_utf8 (' I am a, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' ai\ ' 2145m a CH3 me [is a, a, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I, is a, a, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I am a, a, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I am, one, one, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I, yes, one, one, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I am asd one, one, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I i\ ' m[is a, a, and Ha, OH also,, country! ', 12); Echo '
', Cn_substr_utf8 (' I\ ' m a ch me [is a, a, and Ha, OH also,, country! ', 12); Echo '

Here is the exact intercept of the string:

The specific function code is as follows:

Utf-8 Chinese intercept, single byte intercept mode function Cn_substr_utf8 ($STR, $length, $append = ' ... ', $start =0) {   if (strlen ($STR) < $start + 1) {     return ';   }   Preg_match_all ("/./su", $str, $ar);   $str 2= ';   $tstr = ";   Www.phpernote.com for   ($i =0;isset ($ar [0][$i]), $i + +) {     if (strlen ($TSTR) < $start) {       $tstr. = $ar [0][$ I];     } else{       if (strlen ($str 2) < $length + strlen ($ar [0][$i]) {         $str 2.= $ar [0][$i];       } else{break;}}}      

If you think it's not accurate, you can improve on this basis, or innovation, I hope this article about the PHP interception of string length function is helpful to everyone's learning.

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