PHP implements keyword substitution with highlighted code

/* Useful: Highlight Keywords Requirements: All < and > symbols in the reference article except HTML tags are replaced with < and > respectively $rows [' Content ']=str_replace ("<", "<", $rows [content]); $rows [' Content ']=str_replace (">", ">", $rows [content]); There may be a problem: not high efficiency forgot the case conversion problem $content: A reference article to highlight $key: Keywords site:bbs.it-home.org */ function Highlight ($content, $key) { $k _fi=substr ($key, 0, 1); Get the first character of the keyword $k _len=strlen ($key); Calculate keywords Word count $l _len=strlen ($content); Count the number of articles in a count for ($l _n=0; $l _n< $l _len; $l _n++)//start the cycle according to the count { $l _s=substr ($content, $l _n,1); Get the current character of the article if ($l _s== "<")//If this character is the beginning of the label { while ($l _s!= ">")//We're looking for this label to close { $con. = $l _s; Import Results $l _n++; Of course, start taking the next character in the article. $l _s=substr ($content, $l _n,1); } $con. = $l _s; } ElseIf ($l _s== $k _fi)//If this character is the same as the first character of the keyword { $l _key=substr ($content, $l _n, $k _len); Check whether the current position of the article matches the keyword if ($l _key!= $key) { $con. = $l _s; Import Results } else//if matching { $l _n+= $k _len-1; Count skips the corresponding number of words $con. = "{$key}"; Highlight Keywords } } Else { $con. = $l _s; Import Results } } return $con; } Chinese test Reference string $STR = "Programmer's Home Programmer's home Programmer's house our big Programmer's home is a programmer's house"; Keywords $key = "Home of the programmer"; Calling functions $str _hl=highlight ($str, $key); echo " " . $str _hl. " \ n "; echo ""; echo " " . Htmlspecialchars ($str _hl). " \ n "; ?> Copy Code

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