PHP intercepts utf-8 format string instance code _php instance

PHP intercepts the Utf-8 format string

In PHP, we often need to intercept strings. The English character occupies a byte, the Chinese character occupies two bytes, but the Chinese character occupies two bytes is relative to the GBK encoding but in the current internationally popular UTF8 encoding, a Chinese character occupies 3 bytes. This article introduces a function of PHP to intercept utf-8 format strings.

An example is provided:

function truncate_utf8_string ($string, $length, $etc = ' ... ') {
 $result = ';
 $string = Html_entity_decode (Trim (strip_tags ($string)), ent_quotes, ' UTF-8 ');
 $strlen = strlen ($string);
 for ($i = 0; (($i < $strlen) && ($length > 0));  $i + +) {
 if ($number = Strpos (Str_pad (Decbin (Ord (substr ($string, $i, 1)), 8, ' 0 ', str_pad_left), ' 0 ') {
  if ($length < 1.0) {break
  ;
  }
  $result. = substr ($string, $i, $number);
  $length-= 1.0;
  $i + + $number-1;
 } else {
  $result. = substr ($string, $i, 1);
  $length-= 0.5;
 }
 }
 $result = Htmlspecialchars ($result, ent_quotes, ' UTF-8 ');
 if ($i < $strlen) {
 $result. = $etc;
 }
 return $result;
}

If you need to intercept a string in utf-8 format, call this function directly.

<?php
  $str = "If you need to intercept strings in utf-8 format, call this function directly." ";
  Echo truncate_utf8_string ($STR, 10);//Output result: If you need to intercept utf-8 ...
? >

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