dongpang2483 2016-12-31 01:12
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在文本中搜索单词并突出显示

I am trying to write a php script that takes a text as an input, goes through the whole text (for example it can be a very long essay), and search for the word user inputs in the form.

It should print out the whole text with the highlighted word user was searching for, wherever it was found.

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>Search for a word in text</title>
</head>

<body>

    <form method="post" action="index.php">
        <input type="text" name="text" placeholder="Insert the text you want to search in...">
        <input type="text" name="find_x" placeholder="Insert the word you want to find...">
        <input type="submit" value="Search">
    </form>

    <?php

        // this just prints out a line used to devide input area from a result
        $line = "<br>" . str_repeat("___", 40) . "<br></br>";
        echo $line;

        if ( isset($_POST["text"]) and !empty($_POST["text"]) and 
             isset($_POST["find_x"]) and !empty($_POST["find_x"]) ) 
        {
            $text = $_POST["text"];
            $find_x = $_POST["find_x"];

            // transforms inputs to lowercase so the word is found even if written in uppercase  
            $text_lc = strtolower($text);
            $find_x_lc = strtolower($find_x);

            // find length of searched word
            $length_of_x = strlen($find_x_lc);

            // variable for offsetting
            $offset = 0;

            // prints out all starting positions of a searched word
            while ( $position_in_text = strpos($text_lc, $find_x_lc, $offset) ) 
            {
                echo "The string <b><u>$find_x</u></b> is found in your text and it is at position $position_in_text" . "<br>";
                $offset = $position_in_text + $length_of_x;
            }


            // here I want to print the whole text, and wherever the searched word appears in the text it should be highlighted (bold or underlined). I don't know how to do that!?

        }

    ?>

</body>

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1条回答 默认 最新

  • douchao1864 2016-12-31 02:22
    关注

    Instead of using strpos you could use stripos, this way you can keep the case sensitivity as well. Also note the while( false !== stripos() ) may not even run if the search text is at position 0, meaning that it's at the start of the string, thus the need to check if stripos/strpos will return false or not ( false if no match had been found ).

    <!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>Search for a word in text</title>
</head>

<body>

    <form method="post" action="index.php">
        <input type="text" name="text" placeholder="Insert the text you want to search in...">
        <input type="text" name="find_x" placeholder="Insert the word you want to find...">
        <input type="submit" value="Search">
    </form>

    <?php

        // this just prints out a line used to devide input area from a result
        $line = "<br>" . str_repeat("___", 40) . "<br></br>";
        echo $line;

        if ( isset($_POST["text"]) and !empty($_POST["text"]) and
             isset($_POST["find_x"]) and !empty($_POST["find_x"]) )
        {
            $text = $_POST["text"];
            $find_x = $_POST["find_x"];

            // transforms inputs to lowercase so the word is found even if written in uppercase
            //~ $text_lc = strtolower($text);
            //~ $find_x_lc = strtolower($find_x);

            // find length of searched word
            //~ $length_of_x = strlen($find_x_lc);
            $length_of_x = strlen($find_x);

            // variable for offsetting
            $offset = 0;

            // prints out all starting positions of a searched word
            while ( false !== ( $position_in_text = stripos($text, $find_x, $offset) ) )
            {
                $found_string = substr( $text, $position_in_text, $length_of_x );

                echo "The string <b><u>", htmlspecialchars( $found_string ), "</u></b> is found in your text and it is at position $position_in_text" . "<br>";
                // maybe even sanitizing or escaping some of the texts? XSS here
                //~ $replacement = sprintf( '<strong>%s</strong>', htmlspecialchars( $found_string ) );
                $replacement = sprintf( '<strong>%s</strong>', $found_string );
                $text = substr_replace( $text, $replacement, $position_in_text, $length_of_x );
                $offset = $position_in_text + strlen( $replacement );
            }

            echo $line, $text;             
        }

    ?>

</body>

    Text:
hello world HELLO again and good night heLLo

Search string:
hello

Expected Result should look like:
<strong>hello</strong> world <strong>HELLO</strong> again and good night <strong>heLLo</strong>
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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