10c08-1.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 37 行

<?php
// A function to create warnings on any links:
function warn_links($string) {
    // First, find all the links in the string:
    preg_match_all('|<a\s+href\s*=\s*([\'"])(.*?)\1>|i',
        $string, $results, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);

    // Now, loop over all results, BACKWARDS, to make replacements
    // Backwards so that our offsets don't start changing on us:
    foreach (array_reverse($results) as $r) {
        // [0][1] contains the offset position of the link & [2][0] 
        //  contains the URL - So parse the URL to get it's host:
        $parsed = parse_url($r[2][0]);
        
        // Check the host - if it doesn't exist use this server's hostname:
        $host = isset($parsed['host']) ? $parsed['host'] : 
            $_SERVER['HTTP_HOST'];
        
        // Now insert the 'host' warning:
        $string = substr_replace($string, " [{$host}] ", $r[0][1], 0);
    }        

    return $string;
}

// If we had a POST, then output the data for reference:
if (count($_POST)) {
    echo "<p>The data, with link warnings:</p>\n";
    echo warn_links($_POST['data']);
}
?>
<form action="<?= $_SERVER['PHP_SELF'] ?>" method="post" name="f1">
<p>Enter some data:</p>
<p><textarea name="data" cols="80" 
    rows="10"><?= @$_POST['data'] ?></textarea></p>
<p><input type="submit" /></p>
</form>