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Capture text between tags
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Join Date: Jan 2005
Posts: 294
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Posting Whiz in Training
Hi, is there any php function can read text between tags or quotes.
For example, I have <h1>This is heading 1</h1> and "This is text in Quote", how can I use php to read the text between <h1></h1> tags or the text between quotes? I know I can use substr but is there any function that can directly read the text?
For example, I have <h1>This is heading 1</h1> and "This is text in Quote", how can I use php to read the text between <h1></h1> tags or the text between quotes? I know I can use substr but is there any function that can directly read the text?
Ecommerce-Web-Store.com Building Your e-Business.
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Join Date: Aug 2005
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Posting Whiz in Training
zippee,
I would also like to know how to do this.
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I don't know the answer, but I think I was looking for the exact same thing. I wanted a php script that would visit http://www.whatismyip.com and extract my IP address which was written in the HTML as follows: <h1>Your IP Is xxx.xxx.xxx.xxx</h1>
Is this similar to what you're looking for?
J_
I would also like to know how to do this.
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I don't know the answer, but I think I was looking for the exact same thing. I wanted a php script that would visit http://www.whatismyip.com and extract my IP address which was written in the HTML as follows: <h1>Your IP Is xxx.xxx.xxx.xxx</h1>
Is this similar to what you're looking for?
J_
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Join Date: Jan 2005
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Posting Whiz in Training
No. Your application can be solved using substr alone.
What I try to do is when I use fget() to read a file or a webpage, I can retrieve text in heading. For example, when I used fget("http://www.whatismyip.com") to read the web page, I can get <h1>Your IP - xxx.xxx.xxx.xx</h1>. What I want to do is the php script can read "Your IP - xxx.xxx.xxx.xx" directly for me and stored in db. But since I'm not only want to read the heading text, but also <title> etc, I have to write many line to retrive each data. If there is any function can read something within a specifc tags (say between <h1></h1> or <title></title>) then it would be great.
Anyone?
What I try to do is when I use fget() to read a file or a webpage, I can retrieve text in heading. For example, when I used fget("http://www.whatismyip.com") to read the web page, I can get <h1>Your IP - xxx.xxx.xxx.xx</h1>. What I want to do is the php script can read "Your IP - xxx.xxx.xxx.xx" directly for me and stored in db. But since I'm not only want to read the heading text, but also <title> etc, I have to write many line to retrive each data. If there is any function can read something within a specifc tags (say between <h1></h1> or <title></title>) then it would be great.
Anyone?
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Posting Shark
zippee, you'll want to learn how to use Regular Expressions in PHP. You can find a good Regular Expression tutorial that includes examples for what you are wanting here.
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That's what I want... Thanks chris. I also found http://www.amk.ca/python/howto/regex/regex.html from google search which may be useful to others.
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generally, its better to user string functions, like substr and strpos rather then regular expressions (whenever you can) as the regular expression will take longer to evaluate.
The following function (http://us3.php.net/preg_match) will do the trick:
[PHP]function ExtractString($str, $start, $end)
{
$str_low = strtolower($str);
$pos_start = strpos($str_low, $start);
$pos_end = strpos($str_low, $end, ($pos_start + strlen($start)));
if ( ($pos_start !== false) && ($pos_end !== false) )
{
$pos1 = $pos_start + strlen($start);
$pos2 = $pos_end - $pos1;
return substr($str, $pos1, $pos2);
}
}[/PHP]
This can be used with a string like:
[PHP]
$html_content = '
<body>
<form method="post" action="script.php">
</form>
</body>';
[/PHP]
to find the string between <body> and </body>
[PHP]$match = ExtractString($html_content, '<body>', '</body>');[/PHP]
or even the action url:
[PHP]$match = ExtractString($html_content, 'action="', '"');[/PHP]
note: the function searches for the end tag in a position after the start tag, so it will work in the second example fine.
www.digital-ether.com
The following function (http://us3.php.net/preg_match) will do the trick:
[PHP]function ExtractString($str, $start, $end)
{
$str_low = strtolower($str);
$pos_start = strpos($str_low, $start);
$pos_end = strpos($str_low, $end, ($pos_start + strlen($start)));
if ( ($pos_start !== false) && ($pos_end !== false) )
{
$pos1 = $pos_start + strlen($start);
$pos2 = $pos_end - $pos1;
return substr($str, $pos1, $pos2);
}
}[/PHP]
This can be used with a string like:
[PHP]
$html_content = '
<body>
<form method="post" action="script.php">
</form>
</body>';
[/PHP]
to find the string between <body> and </body>
[PHP]$match = ExtractString($html_content, '<body>', '</body>');[/PHP]
or even the action url:
[PHP]$match = ExtractString($html_content, 'action="', '"');[/PHP]
note: the function searches for the end tag in a position after the start tag, so it will work in the second example fine.
www.digital-ether.com
Last edited by digital-ether; Sep 27th, 2005 at 4:07 am. Reason: typo
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