Question

我尝试过但我很难过。假设我有以下情况：

$string = "Jenny's garden is one of the best in town, it has lush greens and colorful flowers. With what happened to her recently, she could use a new sprinkler system so that she does not have to over exert herself. Perhaps Joel can sell that extra bike to raise money or perhaps put up a garage sale.";

$keyword = "recently";

$length = 136;

// when keyword keyword is empty
$result = "Jenny's garden is one of the best in town, it has lush greens and colorful flowers. With what happened to her recently, she could use a (snip)";

// when keyword is NOT empty
$result = "(snip)it has lush greens and colorful flowers. With what happened to her recently, she could use a new sprinkler system so that she does not h(snip)";

我要做的是获取一个字符串的摘录，如$ result所示，可能以第一次出现的关键字为中心（如果存在）。我很困惑如何使用substr和strpos在php中实现这一点。帮助

Answer 1

这应该适合您的需要：

if ($keyword != "") {
    $strpos = strpos($string, $keyword);
    $strStart = substr($string, $strpos - ($length / 2), $length / 2);
    $strEnd = substr($string, $strpos + strlen($keyword), $length / 2);

    $result = $strStart . $keyword . $strEnd;
}
else {
    $result = substr($string, 0, $length);
}

以下是我使用的测试代码：

<?PHP
$string = "Jenny's garden is one of the best in town, it has lush greens and colorful flowers. With what happened to her recently, she could use a new sprinkler system so that she does not have to over exert herself. Perhaps Joel can sell that extra bike to raise money or perhaps put up a garage sale.";

$keyword = "recently";

$length = 136;

if ($keyword != "") {
    $strpos = strpos($string, $keyword);
    $strStart = substr($string, $strpos - ($length / 2), $length / 2);
    $strEnd = substr($string, $strpos + strlen($keyword), $length / 2);

    $result = $strStart . $keyword . $strEnd;
}
else {
    $result = substr($string, 0, $length);
}

echo $result;
?>

这是与之相呼应的结果：

它有郁郁葱葱的绿色和五颜六色的鲜花。根据她最近发生的事情，她可以使用新的喷水灭火系统，这样她就不必

编辑：修复了我的代码中的几个错误......

注意：这将显示$ 136结果，即136个字符+关键字的长度。如果您希望它只有136，请添加$length = 136 - strlen($keyword);

根据关键字从固定长度的文本中提取字符串

1 个答案: