我认为最简单的方法是通过限制之间的迭代来看待它。
例如：
function balancedWordWrap($input, $maxWidth = null) {
$length = strlen($input);
if (!$maxWidth) {
$maxWidth = min(ceil($length / 2), 75);
}
$minWidth = min(ceil($length / 2), $maxWidth / 2);
$permutations = array();
$scores = array();
$lowestScore = 999;
$lowest = $minWidth;
foreach(range($minWidth, $maxWidth) as $width) {
$permutations[$width] = wordwrap($input, $width);
$lines = explode("\n", $permutations[$width]);
$max = 0;
foreach($lines as $line) {
$lineLength = strlen($line);
if ($lineLength > $max) {
$max = $lineLength;
}
}
$score = 0;
foreach($lines as $line) {
$lineLength = strlen($line);
$score += pow($max - $lineLength, 2);
}
$scores[$width] = $score;
if ($score < $lowestScore) {
$lowestScore = $score;
$lowest = $width;
}
}
return $permutations[$lowest];
}
给定输入“如何做事”
输出结果为
How
to do
things
给定输入 "Mary had a little lamb"
输出结果
Mary had a
little lamb
给定输入 "This extra-long paragraph was writtin to demonstrate how the fmt(1) program handles longer inputs. When testing inputs, you don\'t want them to be too short, nor too long, because the quality of the program can only be determined upon inspection of complex content. The quick brown fox jumps over the lazy dog. Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.", 且最大宽度限制为75个字符时，输出结果如下:
This extra-long paragraph was writtin to demonstrate how the `fmt(1)`
program handles longer inputs. When testing inputs, you don't want them
be too short, nor too long, because the quality of the program can only be
determined upon inspection of complex content. The quick brown fox jumps
over the lazy dog. Congress shall make no law respecting an establishment
of religion, or prohibiting the free exercise thereof; or abridging the
freedom of speech, or of the press; or the right of the people peaceably
to assemble, and to petition the Government for a redress of grievances.
