php替换字符串中间字符为省略号的方法

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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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// 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)