PHP实现把文本中的URL转换为链接的auolink()函数分

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Author: SeeDZ
From: http://code.seebz./p/autolink-php/
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function autolink($str, $attributes = array()) {
    $attrs = '';
    foreach ($attributes as $attribute=>$value) {
        $attrs .= " {$attribute}=\"{$value}\"";
    }
   
    $str = ' '.$str;
    $str = preg_replace('`([^"=\'>])((http|https|ftp|ftps)://[^\s< ]+[^\s<\.)])`i', '$1<a href="$2" rel="external nofollow" '.$attrs.'>$2</a>', $str);
    $str = substr($str, 1);
   
    return $str;
}

<?php
 
$str = 'A link : http://example./?param=value#anchor.';
$str = autolink($str);
 
echo $str; // A link : <a href="http://example./?param=value#anchor" rel="external nofollow" >http://example./?param=value#anchor</a>.
 
?>

<?php
 
$str = 'http://example./';
$str = autolink($str, array("target"=>"_blank","rel"=>"nofollow"));
 
echo $str; // <a href="http://example./" rel="external nofollow" target="_blank" >http://example./</a>
 
?>