本文实例讲述了php替换字符串中间字符为省略号的方法。分享给大家供大家参考。具体分析如下：

对于一个长字符串，如果你只希望用户看到头尾的部分内容，隐藏掉中间内容，你可以使用这个php函数，他可以指定要隐藏掉的中间字符串的数量

/** * Reduce a string by the middle, keeps whole words together * * @param string $string * @param int $max (default 50) * @param string $replacement (default [...]) * @return string * @author david at ethinkn dot com * @author loic at xhtml dot ne * @author arne dot hartherz at gmx dot net */ function strMiddleReduceWordSensitive($string,$max=50,$rep='[...]'){ $strlen = strlen($string); if ($strlen <= $max) return $string; $lengthtokeep = $max - strlen($rep); $start = 0; $end = 0; if (($lengthtokeep % 2) == 0) { $start = $lengthtokeep / 2; $end = $start; } else { $start = intval($lengthtokeep / 2); $end = $start + 1; } $i = $start; $tmp_string = $string; while ($i < $strlen) { if (isset($tmp_string[$i]) and $tmp_string[$i] == ' ') { $tmp_string = substr($tmp_string, 0, $i) . $rep; $return = $tmp_string; } $i++; } $i = $end; $tmp_string = strrev ($string); while ($i < $strlen) { if (isset($tmp_string[$i]) and $tmp_string[$i] == ' ') { $tmp_string = substr($tmp_string, 0, $i); $return .= strrev ($tmp_string); } $i++; } return $return; return substr($string, 0, $start).$rep.substr($string, - $end); }

演示范例：

// example: $text = 'This is a very long test sentence, bla foo bar nothing'; print strMiddleReduceWordSensitive ($text, 30) . "n"; // Returns: This is a very[...]foo bar nothing (~ 30 chrs) print strMiddleReduceWordSensitive ($text, 30, '...') . "n"; // Returns: This is a very...foo bar nothing (~ 30 chrs)

希望本文所述对大家的php程序设计有所帮助。