Count the number of times an id name appears in html and echo total

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Hello folks.
This block of code creates a thumbnail for an individual item in an online shop. This code is duplicated if an item is added to the shop. The item amount could be anything from 1 to 100, depending on how many items are for sale.
What I would like to do is count the amount of times the id="thumb" appears in the html, then echo this amount, for example - 'Number of items: # '

HTML

<div id="thumb">
<div id="thumbbackground">
<a href="../screen-printing/map.php">
<div id="image" class="a"><img src="../screen-printing/thumbnails/map.jpg" width="170" height="170"/></div>
</a>
<div id="prelo1" class="p"></div>
</div>
<div id="thumbname"><p class="desc8">Map</p></div>
</div>

Posted 20-Aug-12 4:46am

Jimtiger

Updated 20-Aug-12 4:57am

v4

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enhzflep · Accepted Answer · 2012-08-20T05:28:00

Solution 1

PHP

$text = '<div id="thumb"><img /></div><div id="thumb"><img /></div>';
$countMe = 'id="thumb"';
$numOccurances = substr_count($text, $countMe);

Posted 20-Aug-12 5:28am

enhzflep

Updated 20-Aug-12 5:29am

v2

Comments

ridoy 20-Aug-12 13:39pm

Though i'm not so familiar with php but it seems to me the logic is right here..so my +5

enhzflep 20-Aug-12 13:58pm

Thanks!

Jimtiger 20-Aug-12 14:40pm

Thanks for your quick response enhzflep, the logics here indeed ridoy (but) I haven't yet managed to implement it correctly(I'm new to php).
I echoed out $numOccurances count and noticed its count is from whats inside $text =
I would like to count the entire web page/or a portion of it where the thumbs are present. Possible?
I tried wrapping all the 'id="thumb"' inside '$text =' for counting but obviously the thumbs would no longer be visible. How would you tackle this one?

enhzflep 20-Aug-12 15:05pm

You're welcome Jimtiger.
Just for clarity, where is the file/content you'd like to examine/count?
Is it:
On someone else's server?
On the same server as the php page?
In the php page?

Jimtiger 20-Aug-12 22:18pm

The file(shop-all.php) is on my server (testing on localhost)
Content to be counted is in file shop-all.php. I hope this helps.

enhzflep 20-Aug-12 23:29pm

Sure does. In that case, you can get the file's data just by using fopen/filesize/fread. Once you've got the data in a variable, you can use it like I used the variable $text in my answer above.

<?php
$filename = 'countTags.php'; // relative path to "shop-all.php"
$fileHandle = fopen($filename, 'r'); // open for reading
$fileSize = filesize($filename);
$contents = fread($fileHandle, $fileSize);
fclose($fileHandle);

// $contents holds the file's contents
$countMe = 'id="thumb"';
$numOccurances = substr_count($contents, $countMe);
printf("File: %s (%d occurances)<br>\n", $filename, $numOccurances);
?>

Jimtiger 22-Aug-12 20:48pm

Enhzflep real nice, although I'm getting a count that's one extra 'thumb' counted from somewhere....?
I just done a 'Find' and the php script is counting the word 'thumb' from -
$countMe = 'id="thumb"'; - Cheeky devil.
So I've added a subtraction of 1 from the the count and it works perfectly!

How would you get round this one as a php pro:) Count only in the div that the thumbs sit in?

Interesting code, the top section is an important addition to the script. How come php has to 'fopen/filesize' shop-all.php for such a task, the read seems to be the magic function?

Could you recommend any sites you use for learning, referencing php magic?

Thanks

enhzflep 23-Aug-12 1:15am

:grins: I wondered if the script would be run on itself - and return an extra occurance of the search string. There's two ways around it - the first is the one you've used - simply decrement the found count. Another way would be to concatenate your search string before using it. Perhaps something like:
$countMe = 'id=';
$countMe .= '"thumb"'
Which would remove that occurance from the file - which could make processing easier later, since you don't have to work out which occurance of the string is being found in the script.

I just go by my knowledge of C, w3c and - something PHP users are quite lucky to have - the PHP manual. I've got the english enhanced version, which is the basic manual with user comments/examples from the (php) website all rolled into one neat chm file. You can get it here: Php Documentation downloads, I have the chm that's 29367kb (that's ~17,500 kb user content)

Jimtiger 23-Aug-12 13:39pm

I tried the second technique just out of interest but I get an error on the '$numOccurances' line...
Parse error: syntax error, unexpected T_VARIABLE

Here's the second half of code I used....

// $contents holds the file's contents
$countMe = 'id=';
$countMe .= '"thumb"'
$numOccurances = substr_count($contents, $countMe);
print($numOccurances);

Thanks this manual will be very useful.

enhzflep 23-Aug-12 14:14pm

The error message probably points to the $numOccurances line. There's a missing semi-colon from your countMe .= line

Jimtiger 23-Aug-12 16:36pm

Yeah that did the trick. I copy and pasted your code. Thanks for your help.