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
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/**
* 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);
}
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演示范例：
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// 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)
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希望本文所述对大家的php程序设计有所帮助。