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MetaEngine
by: Brian Douros
|
August 7, 2001
Version: 1.2
Type: Function
Category: Other
License: Other
Description: This function was created because the get_meta_tags() function does not properly return meta information if the requested file is not formated correctly or if newline, return, and tab characters are present within the meta tag. NOTES: This function will only return meta information for title, keywords, and description.
<?php
/***********************************************************************************
FILE: metaengine.php
FUNCTION: MetaEngine();
AUTHOR: Brian Douros
EMAIL: bjdouros@enteract.com
CREATED: 08/27/2000
MODIFIED: 08/07/2001
INPUT: Any URL value, ($url);
OUTPUT: An array of meta tag information, where the name attribute of the
meta tag is the key value of the array. (e.g. $metatag[title],
$metatag[keywords], $metatag[description])
DESCRIPTION: This function was created because the get_meta_tags() function does
not properly return meta information if the requested file is not
formated correctly or if newline, return, and tab characters are
present within the meta tag.
NOTES: This function will only return meta information for title, keywords,
and description.
COPYTRIGHT: Brian Douros, All Rights Reserved. This script may be used freely
under the GNU General Public License but may not be reproduced for
sale in any manner except with written permsision from Brian Douros.
************************************************************************************/
function MetaEngine($url) {
// Pattern for meta title
$p_title[0] = '(<title>)([a-zA-Z_0-9@!%-;&`,\'\+\$\?\.\n\t\r ]+)';
$p_title[1] = '(<meta[[:space:]]+name[ \'\"]*=[ \'\"]*title[ \'\"]*[[:space:]]*content[ \'\"]*=[ \'\"]*)([a-zA-Z_0-9@!%-;&`,\'\+\$\?\.\n\t\r ]+)';
// Pattern for meta description
$p_description[0] = '(<meta[[:space:]]+name[ \'\"]*=[ \'\"]*description[ \'\"]*[[:space:]]*content[ \'\"]*=[ \'\"]*)([a-zA-Z_0-9@!%-;&`,\'\+\$\?\.\n\t\r ]+)';
// Pattern for meta keywords
$p_keywords[0] = '(<meta[[:space:]]+name[ \'\"]*=[ \'\"]*keywords[ \'\"]*[[:space:]]*content[ \'\"]*=[ \'\"]*)([a-zA-Z_0-9@!%-;&`,\'\+\$\?\.\n\t\r ]+)';
$p_keywords[1] = '(</head>)(.+)';
// Fetch file into an array
if(!($file = @file( $url, "r" ))) {
$keywords = 'Not Available';
$description = 'Not Available';
$title = 'Not Available';
}
else {
// Turn array into a string using a space as the delimiter.
$target = @implode( " ", $file);
$target = stripslashes($target);
// Remove tab, return, and newline characters.
$pat = "\n";
$repl = " ";
$target = ereg_replace($pat, $repl, $target);
$pat = "\t";
$repl = " ";
$target = ereg_replace($pat, $repl, $target);
$pat = "\r";
$repl = " ";
$target = ereg_replace($pat, $repl, $target);
// Evaluate string with regular expression and find match for title.
if(eregi($p_title[0], $target, $match)) {
$title = $match[2];
} //End if
elseif(eregi($p_title[1], $target, $match)) {
$title = $match[2];
} //End else if
else {
$title = 'Not Available';
} //End else
// Evaluate string with regular expression and find match for description.
if(eregi($p_description[0], $target, $match)) {
$description = $match[2];
} //End if
else {
$description = 'Not Available';
} //End else
// Evaluate string with regular expression and find match for keywords.
if(eregi($p_keywords[0], $target, $match)) {
$keywords = $match[2];
} //End if
/* If no meta tag content is presend for keywords use document text as keywords
starting after the </head> tag. */
elseif(eregi($p_keywords[1], $target, $match)) {
//Remove HTML and PHP tags
$match[2] = strip_tags($match[2]);
//Strip white spaces before and after string
$match[2] = trim($match[2]);
//Limit size of string to 1000 characters starting at the 100th character
$match[2] = substr($match[2], 100, 1100);
$keywords = trim($match[2]);
} //End else
else {
$keywords = 'Not Available';
} //End else
} //End if
$metatag[title] = $title;
$metatag[description] = $description;
$metatag[keywords] = $keywords;
return $metatag;
} //End MetaEngine method
?>
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