在PHP stristr中搜索并返回每一边的周围字符

Question

In PHP I am using stristr search but I also want to return and display the surrounding characters each side of the found string, like concordancer. About 9 or 10 characters should be enough, for example: 'below' is the string I have found, but then I want to display context for my users, like this: 'if I sat below the deck'

My current code is

if (stristr($order, $en[$i])) {
$lit= "".$en[$i]."";
$order = str_replace($en[$i], $lit, $order, $count);
$total = $total + $count;
$sub[$loc[$i]] = $sub[$loc[$i]] + $count;
$carreau[$loc[$i]] = $carreau[$loc[$i]]."".$lit." ";
}

Thank you so much for any help.

Answer 1

You want something like $context = substr($order,from,length)

How to calculate from and length?

Use stripos (and arithmetic) to calculate from. Beware it isn't less than 0. Review substr doc for the why).

Use strlen (of the "needle") and arithmetic to determine the length.