2 回答

TA贡献1864条经验 获得超2个赞
您可以只循环访问array_keys返回的值,使用array_slice提取位置两侧的单词,然后内爆以再次将句子重新组合在一起:$concordance
$words = explode(' ', $text);
$concordance = 10;
$results = array();
foreach (array_keys($words, 'in') as $idx) {
$results[] = implode(' ', array_slice($words, max($idx - $concordance, 0), $concordance * 2 + 1));
}
print_r($results);
输出:
Array
(
[0] => least 42 people and infected some 1,400 since its discovery in the city of Wuhan.
Meanwhile, UK-based researchers have warned of a
[1] => not be able to contain the virus.
Travel restrictions have come in place in several affected cities. From Sunday, private vehicles will
[2] => able to contain the virus.
Travel restrictions have come in place in several affected cities. From Sunday, private vehicles will be banned
)
如果要避免生成类似的短语,其中一个单词在单词中出现两次(例如,上述数组中的索引 1 和 2),则可以在最后一个匹配项的末尾保留一个位置,并跳过该匹配项中出现的事件:$concordance
$words = explode(' ', $text);
$concordance = 10;
$results = array();
$last = 0;
foreach (array_keys($words, 'in') as $idx) {
if ($idx < $last) continue;
$results[] = implode(' ', array_slice($words, max($idx - $concordance, 0), $concordance * 2 + 1));
$last = $idx + $concordance;
}
print_r($results);
输出
Array
(
[0] => least 42 people and infected some 1,400 since its discovery in the city of Wuhan.
Meanwhile, UK-based researchers have warned of a
[1] => not be able to contain the virus.
Travel restrictions have come in place in several affected cities. From Sunday, private vehicles will
)

TA贡献1785条经验 获得超4个赞
试试这个:
<?php
$text = <<<EOD
The spread of a deadly new virus is accelerating, Chinese President Xi Jinping warned, after holding a special government meeting on the Lunar New Year public holiday.
The country is facing a "grave situation" Mr Xi told senior officials.
The coronavirus has killed at least 42 people and infected some 1,400 since its discovery in the city of Wuhan.
Meanwhile, UK-based researchers have warned of a real possibility that China will not be able to contain the virus.
Travel restrictions have come in place in several affected cities. From Sunday, private vehicles will be banned from central districts of Wuhan, the source of the outbreak.
EOD;
$words = explode(" ", $text);
$concordance = 10; // range -+
$result = []; // result array
$index = 0;
if (count($words) === 0) // be sure there is no empty array
exit;
do {
$location = array_search("in", $words, false);
if (!$location) // break loop if $location not found
break;
$count = count($words);
// check range of array indexes
$minRange = ($location - $concordance > 0) ? ($location-$concordance) : 0; // array can't have index less than 0 (shorthand if)
$maxRange = (($location + $concordance) < ($count - 1)) ? ($location+$concordance) : $count - 1; // array can't have index equal or higher than array count (shorthand if)
for ($range = $minRange; $range < $maxRange; $range++) {
$result[$index][] = $words[$range]; // group words by index
}
unset($words[$location]); // delete element which contain "in"
$words = array_values($words); // reindex array
$index++;
} while ($location); // repeat until $location exist
print_r($result); // <--- here's your results
?>
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