* array An array of extracted tags, or an empty array if no matching tags were found.Are huge volumes of raw data waiting to be converted into information that you can use? Your organization's hunt for valuable information ends with valuable data mining, which can help to bring more accuracy and clarity in decision making process. * string $charset The character set of the HTML code. * bool $return_the_entire_tag Return the entire matched tag in 'full_tag' key of the results array. Setting it to null will force the script to try and make an educated guess. * bool $selfclosing Whether the tag is self-closing or not. * string|array $tag The tag(s) to extract.
Fminer match portion of html tag code#
* string $html The HTML code to search for tags. * will only be present if you set $return_the_entire_tag to true. * full_tag - the entire matched tag, e.g. * attributes - a name -> value array of the tag's attributes, or an empty array if the tag has none.
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This is always empty for self-closing tags. * offset - the numberic offset of the first character of the tag within the HTML source. * tag_name - the name of the extracted tag, e.g.
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* The function returns a numerically indexed array of extracted tags. * all specified tags (so you can't extract both normal and self-closing tags in one go). * If multiple tags are specified you must also set the $selfclosing parameter and it must be the same for * You can either specify one tag, an array of tag names, or a regular expression that matches the tag name(s). * Extract specific HTML tags and their attributes from a string. That said, here’s a PHP function that can extract any HTML tags and their attributes from a given string : Still, in most cases you’re better off using the PHP DOM extension or even Simple HTML DOM, not messing with convoluted regexps. Also, they are a little bit faster than real parsers when you need to extract something from a very large document (on the order of 400 KB or more). While most parsers require PHP 5 or later, regular expressions are available pretty much anywhere. There are only two advantages to processing HTML with regular expressions – availability and edge-case performance.
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Extracting Tags & Attributes With Regular Expressions However, I personally wouldn’t recommend using it if you care about your script’s performance, as in my tests Simple HTML DOM was about 30 times slower than DOMDocument. Honourable mention : Simple HTML DOM Parser is a popular alternative HTML parser for PHP 5 that lets you manipulate HTML pages with jQuery-like ease. Display the results as in the previous exampleįor more information about DOM and XPath see these resources : to parse the HTML and create the DOM object in one = DOMDocument::loadHTML($html) For example, to find all list items with the class “foo” containing links with the class “bar” and display the link URLs : For more complex tasks, like extracting deeply nested tags, XPath is probably the way to go. In addition to getElementsByTagName() you can also use $dom->getElementById() to find tags with a specific id. Iterate over the extracted links and display their URLs $links = $dom->getElementsByTagName('a') like 'img' or 'table', to extract other tags. You could also use any other tag name here, that will be thrown if the $html string isn't valid all links. The is used to suppress any parsing errors For example, here’s how you could use it to extract all link URLs from a HTML file : //Load the HTML page PHP 5 comes with a usable DOM API built-in that you can use to parse and manipulate (X)HTML documents. There are some (though very few they may be) edge case where regular expressions might work better, so I will discuss both approaches in this post. foo of the second table of this document and return all links contained in those rows”, can also be done much easier with a decent parser. Complex queries, like “find all rows with the class. Regular expressions can be handy for small hacks, but using a real HTML parser will usually lead to simpler and more robust code. However, this is not always – or, as some would insist, ever – the best approach.
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The one that most people will think of first is probably regular expressions. There are several ways to extract specific tags from an HTML document.