Finding phrases in a string/txt/page?

[itsallgood]

Hi All,

Is it possible to search a file/string/or file_get_contents for repeating or common phrases?

For example, if a text file, just pure text, a function to ouput somthing like:

Computer repairs = 4
Computer = 10
Buy Computer = 15
Computer software = 12
Need a computer = 4

-- Searching the contents of a page or file for phrases and words that appear on the document.

I'm trying to make somthing for scanning a page for keywords and phrases for SEO.

I've seen sites that offer this service, so im sure it can be done - but i cannot do it 🙁

Thanks for any help. 🙂

[bpat1434]

Easiest way would be to just do a preg_match() for all the phrases you want.

<?php
$commonPhrases = array(
    'Computer repair',
    'Computer',
    'Buy Computer',
    'Computer software',
    'Need a computer'
);

foreach($commonPhrases as $phrase)
{
    preg_match_all('~('.$phrase.')~iUs', $string_to_search_in, $matches);
    $commonPhrases[$phrase] = count($matches[1]);
}

print_r($commonPhrases);

Problem with that is that this will do a loose match so "Buy a computer" and "computer" will both return a duplicate result, as would "Computer parts" and "computer". Since "computer" is so generalized...

[CoderDan]

could also use something like this:

<?php
$commonPhrases = array(
	'Computer repair',
	'Buy Computer',
	'Computer software',
	'Need a computer'
	'Computer',
);

$common_phrases_fixed = array_map( 'preg_quote', $commonPhrases, array_fill( 0, count( $commonPhrases ) ,'~' ) );
preg_match_all( '~('.join( '|', $common_phrases_fixed ).')~iUs', $string_to_search_in, $matches );

print_r( $matches );
?>

the results could then be filtered down to prevent duplicate matches I think, unless you want to match the same part of the text multiple times if they match multiple keyword entries, then what you had was fine.