function drupal_truncate_bytes
drupal_truncate_bytes($string, $len)
Truncates a UTF-8-encoded string safely to a number of bytes.
If the end position is in the middle of a UTF-8 sequence, it scans backwards until the beginning of the byte sequence.
Use this function whenever you want to chop off a string at an unsure location. On the other hand, if you're sure that you're splitting on a character boundary (e.g. after using strpos() or similar), you can safely use substr() instead.
Parameters
$string: The string to truncate.
$len: An upper limit on the returned string length.
Return value
The truncated string.
File
- includes/unicode.inc, line 274
- Provides Unicode-related conversions and operations.
Code
function drupal_truncate_bytes($string, $len) { if (strlen($string) <= $len) { return $string; } if ((ord($string[$len]) < 0x80) || (ord($string[$len]) >= 0xC0)) { return substr($string, 0, $len); } // Scan backwards to beginning of the byte sequence. while (--$len >= 0 && ord($string[$len]) >= 0x80 && ord($string[$len]) < 0xC0); return substr($string, 0, $len); }
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https://api.drupal.org/api/drupal/includes!unicode.inc/function/drupal_truncate_bytes/7.x