find a specific word in external page - php

Question

How to find a specific word in a external page using php ?
(dom or pregmatch, or what else ?)
example in foo.com source code with :
span name="abcd"
I want to check if the word abcd is in foo.com in php

Answer 1

if(preg_match('/span\s+name\=\"abcd\"/i', $str)) echo 'exists!';

Answer 2

To check if a string of characters exist:
<?php
$term = 'abcd';
if ( preg_match("/$term/", $str) ) {
// yes it does
}
?>
To check if that string exists as a word in its own right (ie, is not in the middle of a larger word) use word boundary matchers:
<?php
$term = 'abcd';
if ( preg_match("/\b$term\b/", $str) ) {
// yes it does
}
?>
For a case-insensitive search, add the i flag after the last slash in the regex:
<?php
$term = 'abcd';
if ( preg_match("/\b$term\b/i", $str) ) {
// yes it does
}
?>

Answer 3

$v = file_get_contents("http://foo.com");
echo substr_count($v, 'abcd'); // number of occurences
//or single match
echo substr_count($v, ' abcd ');

Answer 4

Here are other few ways to find specific word
<?php
$str = 'span name="abcd"';
if (strstr($str, "abcd")) echo "Found: strstr\n";
if (strpos($str, "abcd")) echo "Found: strpos\n";
if (ereg("abcd", $str)) echo "Found: ereg\n";
if (substr_count($str, 'abcd')) echo "Found: substr_count\n";
?>

Answer 5

$name = 'foo.php';
file_get_contents($name);
$contents=$pattern = preg_quote('abcd', '/');
// finalise the regular expression, matching the whole line
$pattern = "/^.*$pattern.*\$/m";
// search, and store all matching occurences in $matches
if(preg_match_all($pattern, $contents, $matches)){
echo implode("\n", $matches[0]);
}
else{
echo "not exist word";
}